National Home Inspector Examination (NHIE) — Questions and Answers

Question 1: What is the correct interpretation when a furnace's control board displays a fault code with two LED flashes followed by a pause?

The furnace is operating normally in a two-stage heating mode
The igniter is warming up and the furnace will fire within 30 seconds
A specific diagnostic code indicating a fault condition — the meaning must be looked up on the furnace's fault code chart (Correct answer)
The primary limit switch has been reset and the furnace is ready

Correct answer: A specific diagnostic code indicating a fault condition — the meaning must be looked up on the furnace's fault code chart

Modern furnace control boards use LED flash codes to communicate specific fault conditions; the home inspector should reference the fault code chart typically printed inside the furnace panel.

Question 2: During inspection, the inspector notices the furnace burners produce a lazy yellow or orange flame rather than a sharp blue flame. What does this indicate?

The heat exchanger is oversized
The thermostat is set too high
Incomplete combustion due to improper air-fuel mixture, possibly indicating a dirty burner or restricted air supply (Correct answer)
The furnace is operating at peak efficiency

Correct answer: Incomplete combustion due to improper air-fuel mixture, possibly indicating a dirty burner or restricted air supply

A properly adjusted gas burner burns with a blue flame; yellow or orange flames indicate incomplete combustion, which can produce carbon monoxide.

Question 3: What is the standard minimum headlap for asphalt roof shingles?

2 inches (Correct answer)
1 inch
3 inches
4 inches

Correct answer: 2 inches

A 2-inch minimum headlap is required for standard asphalt shingles to ensure water cannot penetrate between courses.

Question 4: A home inspector observes that a long span beam in a great room has a visible camber (upward bow) at mid-span. How should this be interpreted?

Camber indicates the beam was installed upside down and must be replaced
Any visible bow in a beam is a code violation regardless of direction
Camber is typically intentional in engineered beams to offset expected deflection under load (Correct answer)
Upward camber always indicates that the beam is overloaded and about to fail

Correct answer: Camber is typically intentional in engineered beams to offset expected deflection under load

Engineered beams are often manufactured with a deliberate upward camber so that once loaded, they deflect back to a level or near-level position.

Question 5: An inspector finds that the grading around a home's foundation slopes toward the building. What is the recommended correction?

Re-grade so the soil slopes away at least 6 inches over the first 10 feet (Correct answer)
Add window wells to basement windows
Install interior drain tile
Apply waterproof coating to the interior wall

Correct answer: Re-grade so the soil slopes away at least 6 inches over the first 10 feet

Positive drainage requires the grade to fall at least 6 inches within the first 10 feet from the foundation to direct surface water away and prevent basement seepage.

Question 6: A home inspector finds a service panel with circuit breakers labeled "FPE Stab-Lok." This finding should be reported as a significant safety concern primarily because these panels are known for which of the following?

Using an outdated grounding method that is no longer code-compliant.
Containing asbestos insulation, which is a respiratory hazard.
Being susceptible to water intrusion due to poor case design.
A high rate of manufacturing defects causing breakers to fail to trip. (Correct answer)

Correct answer: A high rate of manufacturing defects causing breakers to fail to trip.

Federal Pacific Electric (FPE) Stab-Lok panels and breakers have a well-documented history of failing to trip during an overcurrent or short-circuit event. This failure can lead to wiring overheating, creating a substantial risk of fire. Independent testing has shown a high failure rate for these breakers, making their presence a major safety hazard.

Question 7: A home inspector observes that a metal roof has exposed fasteners. What concern should be noted?

Potential for leaks as fastener sealants degrade over time (Correct answer)
Improper color selection
Violation of fire rating requirements
Incompatibility with underlayment

Correct answer: Potential for leaks as fastener sealants degrade over time

Exposed fastener metal roofs rely on neoprene washers and sealants that degrade over time, eventually allowing water infiltration at each fastener point.

Question 8: Why is spray foam insulation sometimes flagged as a concern in attics even when properly installed?

It reduces the R-value of the assembly over time
It can conceal the roof sheathing, preventing visual inspection of moisture damage or rot (Correct answer)
It always voids roof warranties
It reduces attic storage space

Correct answer: It can conceal the roof sheathing, preventing visual inspection of moisture damage or rot

Spray foam applied to roof sheathing in an unvented attic covers the wood, making it impossible for an inspector to visually detect moisture damage, rot, or sheathing defects.

Question 9: What does the acronym "HVAC" stand for?

Home Ventilation and Cooling
Household Air Quality and Conditioning
Heating and Ventilation Control
Heating, Ventilation, and Air Conditioning (Correct answer)

Correct answer: Heating, Ventilation, and Air Conditioning

HVAC is a widely recognized industry acronym that stands for Heating, Ventilation, and Air Conditioning. It encompasses the systems and technologies used to control the temperature, humidity, and purity of the air within an enclosed space. The goal of HVAC systems is to provide thermal comfort and maintain acceptable indoor air quality for occupants.

Question 10: What is the minimum slope required for a 3-inch horizontal drain pipe per the International Plumbing Code?

1/16 inch per foot
1/4 inch per foot
1/2 inch per foot
1/8 inch per foot (Correct answer)

Correct answer: 1/8 inch per foot

A 3-inch horizontal drain requires a minimum slope of 1/8 inch per foot (approximately 1%) to ensure adequate flow.

Question 11: What is the purpose of a 'let-in brace' in wood-frame wall construction?

A horizontal block between studs at mid-height to prevent buckling
A diagonal board notched into studs to provide lateral (shear) resistance (Correct answer)
A metal strap installed at the wall corner for seismic uplift resistance
A horizontal board used to space studs at the correct interval

Correct answer: A diagonal board notched into studs to provide lateral (shear) resistance

A let-in brace is a diagonal 1x4 board notched flush into studs to stiffen the wall against racking caused by lateral (wind or seismic) loads.

Question 12: Which type of roofing material is most commonly associated with 'cupping' as a defect?

Clay tiles
Metal panels
Asphalt shingles (Correct answer)
Wood shingles

Correct answer: Asphalt shingles

Cupping in asphalt shingles occurs when the edges curl upward, typically caused by moisture imbalance or improper ventilation.

Question 13: Please check the statement that best describes a report written following an examination of a vacant property:

Pre-closing inspection is recommended. (Correct answer)
The plumbing system is not available to inspect at this time.
Unable to determine the total condition of the electrical system at this time.
The plumbing system is not available to inspect at this time.

Correct answer: Pre-closing inspection is recommended.

When inspecting a vacant property, systems like plumbing or electrical may be shut off, making a full assessment impossible. Recommending a pre-closing inspection ensures that all systems can be tested once utilities are active, providing a complete picture of the property's condition before the sale is finalized. This allows for a comprehensive evaluation.

Question 14: What does the term 'material defect' mean in the context of a home inspection report?

A defect that costs more than $500 to repair
Any defect that requires a building material to be replaced
A defect visible only with specialized equipment
A condition that has a significant adverse impact on the value of the property or that poses an unreasonable risk to people (Correct answer)

Correct answer: A condition that has a significant adverse impact on the value of the property or that poses an unreasonable risk to people

A material defect is defined by its impact on safety, habitability, or property value — not simply by repair cost or visibility.

Question 15: Which of the following best describes 'polybutylene' piping, which may be found in homes built between 1978 and 1995?

A blue-tinted copper alloy used for hot water lines
A gray plastic pipe that became prone to micro-fractures and leaks, leading to widespread recalls (Correct answer)
A high-density polyethylene pipe used for main water service
A flexible corrugated stainless steel tubing for gas lines

Correct answer: A gray plastic pipe that became prone to micro-fractures and leaks, leading to widespread recalls

Polybutylene pipe reacts with oxidants in public water supplies, causing it to flake and crack from the inside out, often resulting in catastrophic leaks.

Question 16: What is 'negative grading' and why does a home inspector flag it?

A retaining wall that leans inward
Ground that slopes toward the foundation, directing surface water against the house (Correct answer)
Insufficient concrete strength in the footing
A foundation that is below the frost line

Correct answer: Ground that slopes toward the foundation, directing surface water against the house

Negative grading means the surrounding soil or landscaping slopes toward the foundation rather than away, channeling rain and surface water toward the structure and increasing moisture intrusion risk.

Question 17: A home inspector notes missing insulation baffles at the eaves. Why is this a deficiency?

Baffles are cosmetic only and not required
Baffles are only required in new construction
Baffles improve R-value directly
Without baffles, insulation can block soffit vents and restrict ventilation (Correct answer)

Correct answer: Without baffles, insulation can block soffit vents and restrict ventilation

Insulation baffles (rafter vents) maintain a clear airflow channel from soffit vents to the attic; without them, blown-in or batt insulation can block the intake vents.

Question 18: Which type of foundation crack is generally considered most serious in a poured concrete foundation?

Horizontal cracks in the middle of the wall (Correct answer)
Vertical cracks near the center of the wall
Diagonal cracks at corners of window openings
Hairline shrinkage cracks

Correct answer: Horizontal cracks in the middle of the wall

Horizontal cracks in foundation walls indicate lateral soil or hydrostatic pressure bowing the wall inward, which is a serious structural deficiency requiring professional evaluation.

Question 19: Please indicate the component that SHOULD NOT be included in the reports of the house inspections:

Address of the property inspected
Status of the home as occupied or vacant
Remaining life expectancy of appliances (Correct answer)
Weather conditions at time of inspection

Correct answer: Remaining life expectancy of appliances

Home inspections focus on the current condition and function of systems and components, identifying defects. Estimating the remaining life expectancy of appliances, while potentially useful, is generally outside the scope of a standard home inspection and can be speculative. Inspectors typically report on whether an appliance is functional or defective at the time of inspection, not its future lifespan.

Question 20: What type of insulation is typically required to be covered with a thermal barrier (such as drywall) when installed in living spaces?

Spray polyurethane foam (SPF) (Correct answer)
Rigid mineral wool board
Mineral wool batt
Fiberglass batt

Correct answer: Spray polyurethane foam (SPF)

Spray polyurethane foam is combustible and must be covered with an approved thermal barrier like ½-inch drywall to limit fire spread in occupied spaces.

Question 21: Which of the following best describes step flashing?

A pre-formed metal cap placed over a ridge
Flashing installed at roof valleys only
Individual L-shaped metal pieces interwoven with shingles at a vertical wall (Correct answer)
A continuous piece of metal run along a horizontal wall-roof junction

Correct answer: Individual L-shaped metal pieces interwoven with shingles at a vertical wall

Step flashing consists of individual L-shaped metal pieces installed one per shingle course where a roof meets a vertical wall, directing water onto the shingles.

Question 22: What is pyrite-induced heaving in a foundation context?

Frost heave in cold climates
Expansion of pyrite-bearing fill material when oxidized, causing slab or basement floor upheaval (Correct answer)
Settlement from poorly compacted fill
Damage from tree root intrusion under the slab

Correct answer: Expansion of pyrite-bearing fill material when oxidized, causing slab or basement floor upheaval

When fill containing pyrite (iron sulfide) is used beneath a slab, it can oxidize and expand, causing upward heaving of the concrete floor or foundation.

Question 23: During a plumbing inspection, what does a 'trap' in a drain line primarily prevent?

Water hammer in supply pipes
Debris clogs in main drain lines
Pipe freezing in cold climates
Sewer gases from entering the living space (Correct answer)

Correct answer: Sewer gases from entering the living space

A plumbing trap holds a water seal that blocks sewer gases, including potentially toxic methane and hydrogen sulfide, from entering the home.

Question 24: Which component is responsible for distributing treated water throughout a house's plumbing system?

Drain pipe
Water heater
Water supply line (Correct answer)
Faucet

Correct answer: Water supply line

The water supply lines, also known as distribution pipes, are the network of pipes responsible for carrying treated, potable water throughout a house. These lines connect from the main service line, through the water heater (for hot water), and then distribute water to all fixtures and appliances. They are fundamental for delivering water for drinking, bathing, and other household uses.

Question 25: An inspector observes that a 3-inch horizontal drain pipe has a slope of 1/2 inch per foot. What concern should the inspector note?

There is no concern; 1/2 inch per foot is always acceptable
The slope is too shallow and will cause slow drainage
The slope is too steep and solids may separate from liquid, causing clogs (Correct answer)
A 3-inch pipe requires a minimum 1/2-inch slope

Correct answer: The slope is too steep and solids may separate from liquid, causing clogs

Excessive slope causes water to run ahead of solids, leaving waste behind to accumulate and eventually clog the pipe.

Question 26: What is the primary function of an expansion tank on a residential water heater?

To filter sediment from the water supply
To preheat cold water before it enters the tank
To accommodate the increased volume of water as it heats and expands in a closed system (Correct answer)
To reduce water hammer in supply lines

Correct answer: To accommodate the increased volume of water as it heats and expands in a closed system

When a backflow preventer or check valve creates a closed system, heated water has nowhere to expand; an expansion tank absorbs that extra volume to prevent pressure buildup.

Question 27: An inspector finds a sub-panel in a detached garage with the neutral and ground buses bonded together. What is the issue?

The bond is required only if the garage is on a separate meter
There is no issue as long as the main panel also has a bond
Bonding neutral and ground in a sub-panel creates a parallel neutral path and shock hazard on metal enclosures (Correct answer)
Sub-panels in detached structures always require bonded buses

Correct answer: Bonding neutral and ground in a sub-panel creates a parallel neutral path and shock hazard on metal enclosures

In a sub-panel, neutral and ground must remain separate; bonding them creates a return current path on grounding conductors and metal enclosures, causing shock risk.

Question 28: A homeowner conducting a self-guided virtual inspection shows the inspector a GFCI outlet in the kitchen but does not test it. What should the inspector instruct the homeowner to do?

Simply verify the GFCI outlet is present and move on
Press the TEST button to trip the outlet, verify it loses power, then press RESET to restore it (Correct answer)
Replace the outlet immediately since it was not tested
Check if the outlet is within 6 inches of the sink

Correct answer: Press the TEST button to trip the outlet, verify it loses power, then press RESET to restore it

GFCI outlets must be functionally tested — visual presence alone does not confirm the device will trip when it detects a ground fault.

Question 29: Please indicate what the abbreviation EIFS means:

Exterior insulation and finish system (Correct answer)
Exterior insulation for security
Exterior installation for security
Exterior installation of finishing system

Correct answer: Exterior insulation and finish system

EIFS stands for Exterior Insulation and Finish System. It is a non-load bearing building cladding system that provides exterior walls with an insulated finished surface and waterproofing. Understanding this abbreviation is crucial for home inspectors to properly identify and assess this common building material.

Question 30: While inspecting a newly installed bathroom sink, you notice the trap arm, which is a 1 1/2-inch pipe, connects to the vent stack only 2 inches from the trap weir. This installation is a defect because:

The trap arm must be at least 6 inches long.
The trap arm must slope upwards towards the vent.
A 1 1/2-inch pipe is too small for a bathroom sink.
The vent connection is too close, creating a prohibited crown vent. (Correct answer)

Correct answer: The vent connection is too close, creating a prohibited crown vent.

Plumbing codes require a minimum distance between the trap weir and the vent to prevent siphoning. This minimum distance is two times the pipe's diameter. For a 1 1/2-inch pipe, the minimum trap arm length is 3 inches (1.5 x 2). An installation with only 2 inches creates a 'crown vent,' which is prohibited because it can easily become clogged and lead to the trap siphoning dry.

Question 31: Which of the following best describes how a home inspector documents a furnace that is functional but has a minor safety concern such as a missing blower door panel?

Note it as a safety hazard requiring correction, with a recommendation to consult a licensed HVAC technician (Correct answer)
Do not report it since the furnace still produces heat
Recommend immediate replacement of the entire furnace unit
List it as informational with no action required

Correct answer: Note it as a safety hazard requiring correction, with a recommendation to consult a licensed HVAC technician

A missing blower door affects combustion air balance and safety; it should be documented as a safety deficiency requiring correction by a qualified technician.

Question 32: What is the minimum recommended slope for asphalt shingles to prevent water infiltration?

1:12
6:12
4:12
2:12 (Correct answer)

Correct answer: 2:12

Asphalt shingles require a minimum slope of 2:12 (2 inches of rise per 12 inches of run), though steeper slopes are preferred.

Question 33: While inspecting a recently remodeled kitchen, a home inspector notes that a new 125-volt, 15-amp receptacle is installed 18 inches from the edge of the kitchen sink to serve a countertop appliance. Which safety device is MOST likely required for this receptacle?

An Arc-Fault Circuit Interrupter (AFCI).
A surge protector.
A Ground-Fault Circuit Interrupter (GFCI). (Correct answer)
A dedicated 20-amp circuit.

Correct answer: A Ground-Fault Circuit Interrupter (GFCI).

The National Electrical Code (NEC) requires Ground-Fault Circuit Interrupter (GFCI) protection for virtually all receptacles serving kitchen countertops in dwelling units. GFCIs are designed to protect people from electric shock by quickly shutting off power if they detect an imbalance in the current, which can occur if electricity finds a path to ground through a person, especially in potentially wet locations like kitchens.

Question 34: What is the standard net free area ventilation ratio required by most US building codes for attic ventilation?

1:100
1:200
1:300
1:150 (Correct answer)

Correct answer: 1:150

Building codes generally require a minimum of 1 square foot of net free ventilation area for every 150 square feet of attic floor space.

Question 35: When inspecting a home built in the 1960s, a home inspector finds that the roof is framed with rafters but there are no collar ties or ridge beam — only a non-structural ridge board. What is the likely consequence over time?

Without collar ties, outward thrust causes the walls to spread and the ridge to sag (Correct answer)
Non-structural ridge boards are acceptable in warm climates with no snow
Ridge boards alone are sufficient to carry all rafter loads without collar ties
The absence of collar ties only affects the roof's ability to resist snow loads

Correct answer: Without collar ties, outward thrust causes the walls to spread and the ridge to sag

Without collar ties to resist horizontal thrust, rafter loads push the top of the walls outward, allowing the ridge to drop over time.

Question 36: What condition is described when an inspector reports that wood structural members show signs of 'checking'?

Longitudinal cracks along the grain caused by uneven drying or seasonal movement (Correct answer)
Dark staining from water infiltration
Decay fungi visible on the wood surface
Insect galleries running through the wood grain

Correct answer: Longitudinal cracks along the grain caused by uneven drying or seasonal movement

Checking refers to surface cracks that run parallel to the wood grain, caused by differential shrinkage as lumber dries; minor checking is cosmetic but deep checking can reduce structural capacity.

Question 37: What does an inspector look for when evaluating recessed light fixtures in an insulated ceiling?

Trim style and finish
Bulb wattage compliance
The brand and age of the fixture
Whether they are rated IC (insulation contact) or non-IC (Correct answer)

Correct answer: Whether they are rated IC (insulation contact) or non-IC

Non-IC-rated recessed fixtures must maintain clearance from insulation; covering them with insulation creates a fire hazard and requires IC-rated fixtures instead.

Question 38: A home inspector notes that the roof deck shows sagging between rafters. What is the most likely cause?

Ventilation ridge cap failure
Inadequate decking thickness or rafter spacing (Correct answer)
Excessive granule accumulation
Improper shingle installation

Correct answer: Inadequate decking thickness or rafter spacing

Sagging between rafters (also called racking) typically results from decking that is too thin for the rafter spacing, or from structural rafter damage.

Question 39: A home inspector sees moss growing on the north-facing slope of a roof. What is the primary structural concern?

Moss adds weight that can break shingles
Moss indicates improper attic ventilation only
Moss retains moisture that accelerates shingle deterioration and decay (Correct answer)
Moss growth is cosmetic and poses no structural risk

Correct answer: Moss retains moisture that accelerates shingle deterioration and decay

Moss holds moisture against the roof surface, accelerating the breakdown of shingle granules and potentially causing wood rot in the underlying deck.

Question 40: When inspecting a forced-air furnace system, an inspector notes that the metal flue pipe has a horizontal run of 8 feet before it enters the chimney. For proper drafting of exhaust gases, this horizontal pipe should:

Have a continuous upward slope towards the chimney (Correct answer)
Be perfectly level to ensure even flow
Be insulated to maintain high gas velocity
Have a downward slope away from the chimney

Correct answer: Have a continuous upward slope towards the chimney

The flue vent for a standard-efficiency furnace must have a continuous upward slope from the furnace to the chimney, typically a minimum of 1/4 inch per foot of horizontal run. This upward slope helps the hot, buoyant exhaust gases to vent naturally and prevents condensation from running back into the furnace.

Question 41: What does a double-tapped breaker mean, and why is it a concern?

Two breakers sharing one neutral wire
A breaker installed upside down in the panel
A breaker rated for double the normal amperage
Two wires connected to one breaker terminal, risking poor contact and overheating (Correct answer)

Correct answer: Two wires connected to one breaker terminal, risking poor contact and overheating

Most breakers are rated for only one wire; two wires can cause loose connections, arcing, and inadequate overcurrent protection.

Question 42: A home inspector notices that multiple floor joists have been notched at mid-span to accommodate plumbing pipes. What is the primary structural concern?

Notching only affects fire resistance ratings
The concern is purely aesthetic with no structural implication
Mid-span notching significantly reduces the joist's bending strength (Correct answer)
Notching at mid-span is acceptable if pipes are properly insulated

Correct answer: Mid-span notching significantly reduces the joist's bending strength

Notching floor joists at mid-span removes material from the highest-stress zone, drastically reducing their load-carrying capacity.

Question 43: What is the primary function of a fireplace damper that a home inspector verifies during an inspection?

Control airflow and prevent conditioned air loss when the fireplace is not in use (Correct answer)
Support the weight of the flue liner above
Filter smoke particles before they exit the flue
Direct combustion gases toward the chimney cap

Correct answer: Control airflow and prevent conditioned air loss when the fireplace is not in use

A damper controls the flue opening to regulate draft and prevents heated or cooled air from escaping through the chimney when the fireplace is not in use.

Question 44: Which of the following is the BEST evidence that a crawl space ground cover vapor barrier is functioning properly?

The barrier is stapled to the joists above
The barrier is 4 mil polyethylene
The barrier covers at least 6 inches up the walls and is continuous with no gaps (Correct answer)
The barrier is white in color

Correct answer: The barrier covers at least 6 inches up the walls and is continuous with no gaps

A properly installed ground cover vapor barrier should be continuous, overlap at seams, and run up the foundation walls at least 6 inches to prevent ground moisture from entering the crawl space.

Question 45: A home inspector observes diagonal cracking emanating from the corners of window openings on an exterior wall. This pattern MOST commonly indicates:

Normal shrinkage of framing lumber over time
Excessive roof live loads transmitted to the wall
Differential foundation settlement causing wall racking (Correct answer)
Improper window casing installation

Correct answer: Differential foundation settlement causing wall racking

Diagonal cracks from window corners are a classic sign of differential foundation movement causing the wall framing to rack.

Question 46: An inspector finds an outdoor receptacle with a cover that is only rated for 'closed while in use.' What is inadequate about this?

Outdoor outlets do not need covers if they are under an overhang
Current NEC requires 'in-use' (bubble) covers that protect the outlet even while a cord is plugged in (Correct answer)
Closed-while-in-use covers meet all current NEC requirements
Only metal covers are acceptable for outdoor outlets

Correct answer: Current NEC requires 'in-use' (bubble) covers that protect the outlet even while a cord is plugged in

NEC now requires in-use covers that maintain a weatherproof seal even with a cord plugged in, since flat covers leave the outlet exposed to moisture during use.

Question 47: Which of the following best describes a 'king stud' in window or door framing?

The center stud of a wall panel used as a reference for layout
A stud that is doubled to carry extra point loads from above
A full-height stud running from sole plate to top plate alongside a jack stud to support the header (Correct answer)
A stud installed diagonally to provide lateral bracing at openings

Correct answer: A full-height stud running from sole plate to top plate alongside a jack stud to support the header

King studs run the full height of the wall on each side of an opening, bearing on the top plate and anchoring the jack studs that directly support the header.

Question 48: Spalling bricks observed on a chimney exterior during a home inspection most commonly indicate what condition?

The chimney is structurally too tall relative to its base width
Chronic moisture intrusion causing freeze-thaw deterioration inside the brick (Correct answer)
The bricks were laid in an incorrect bond pattern during original construction
The mortar mix used was too strong relative to the brick hardness

Correct answer: Chronic moisture intrusion causing freeze-thaw deterioration inside the brick

Spalling occurs when water absorbed into porous brick freezes, expands, and breaks away the brick face, indicating a long-standing moisture problem.

Question 49: An inspector observes a 'S-trap' configuration under a bathroom sink drain. Why is this a deficiency?

S-traps are only allowed on two-story homes
S-traps require special tools to clean
S-traps are prohibited because they reduce water flow
S-traps can siphon their water seal, allowing sewer gases to enter the home (Correct answer)

Correct answer: S-traps can siphon their water seal, allowing sewer gases to enter the home

The S-trap's shape causes the water to siphon out of the trap as it drains, destroying the water seal that blocks sewer gases; a P-trap with proper venting is the code-compliant alternative.

Question 50: A home inspector finds that roof rafters are pulling away from the ridge board. What framing deficiency does this MOST likely indicate?

Excessive attic insulation compressing the rafters
Ridge board installed at the wrong elevation
Overloading of the ridge board from above
Insufficient collar ties or rafter ties allowing outward thrust (Correct answer)

Correct answer: Insufficient collar ties or rafter ties allowing outward thrust

Without adequate collar ties or rafter ties, horizontal outward thrust from roof loads causes rafters to spread and pull away from the ridge.

Question 51: Which of the following best describes 'hydrostatic pressure' as it relates to foundation inspection?

Pressure from expanding clay soils during dry periods
Internal air pressure differences in a sealed basement
The weight of the structure pushing down on the foundation
Water pressure exerted against foundation walls and floors by saturated soil or a high water table (Correct answer)

Correct answer: Water pressure exerted against foundation walls and floors by saturated soil or a high water table

Hydrostatic pressure is the lateral and upward force exerted by water-saturated soil or groundwater against foundation walls and slabs, a leading cause of basement water intrusion.

Question 52: An online inspector is evaluating a home's HVAC system remotely. What is the best method for the homeowner to demonstrate the system's operation?

Run the system through a full heating and cooling cycle while filming the registers and thermostat (Correct answer)
Show the inspector the equipment brand label only
Point the camera at the outdoor condenser unit only
Read the HVAC manual aloud to the inspector

Correct answer: Run the system through a full heating and cooling cycle while filming the registers and thermostat

Observing airflow at registers, thermostat response, and audible operation during a full cycle provides the inspector with functional performance data.

Question 53: During a home inspection, you observe a kitchen sink drain that makes a 'gurgling' sound after water has been drained and a faint sewer gas odor is present. What is the MOST likely cause of these issues?

The supply line water pressure is too high.
A blocked or improperly installed vent stack. (Correct answer)
The P-trap is installed backward.
The drain line has an excessive slope.

Correct answer: A blocked or improperly installed vent stack.

The vent stack's primary functions are to allow sewer gases to escape to the exterior and to introduce air into the DWV system to prevent a vacuum. Gurgling sounds and sewer odors are classic signs that the vent is blocked or improperly installed, causing negative pressure that siphons water from the P-trap, breaking the water seal that normally blocks sewer gas.

Question 54: An inspector finds that a sump pump discharge pipe terminates just outside the foundation wall. Why is this deficient?

The pipe must be buried for aesthetics
Water can drain back toward the foundation and re-enter the sump (Correct answer)
It reduces pump motor life
It creates a tripping hazard

Correct answer: Water can drain back toward the foundation and re-enter the sump

Sump discharge must terminate far enough from the foundation—typically at least 10 feet—so discharged water cannot percolate back into the soil around the basement.

Question 55: A gas furnace is installed in a garage. Which additional safety requirement applies to this installation?

The furnace burner and ignition sources must be elevated at least 18 inches above the floor (Correct answer)
A carbon monoxide detector must be hardwired directly to the furnace control board
The furnace must be rated for outdoor use
The gas line must be stainless steel in a garage environment

Correct answer: The furnace burner and ignition sources must be elevated at least 18 inches above the floor

In garages, furnaces must be elevated 18 inches above the floor to keep ignition sources above the level where gasoline vapors (which are heavier than air) can accumulate.

Question 56: A home inspector notes that the main electrical service panel is located inside a bathroom closet. Why is this a concern?

Moisture in bathrooms can damage electrical components and create shock hazards (Correct answer)
Building codes require panels to face magnetic north for safety
Panels in closets use more electricity than those in open spaces
Bathroom panels are only allowed in homes built before 1978

Correct answer: Moisture in bathrooms can damage electrical components and create shock hazards

Electrical panels must not be located in bathrooms because moisture and steam create shock and corrosion hazards, and is prohibited by the NEC.

Question 57: What is the correct installation orientation for kraft-faced fiberglass batt insulation in an exterior wall?

Kraft facing can face either direction
Kraft facing toward the interior (warm-in-winter side) (Correct answer)
Kraft facing toward the exterior
Kraft facing should be removed before installation

Correct answer: Kraft facing toward the interior (warm-in-winter side)

Kraft facing acts as a vapor retarder and must face the warm-in-winter side (interior) to prevent moisture from migrating into the wall cavity.

Question 58: Which section of a home should be prioritized first during a remote video walkthrough to assess structural integrity?

Window treatments
Kitchen appliances
Foundation and basement (Correct answer)
Interior paint colors

Correct answer: Foundation and basement

The foundation and basement reveal critical structural issues such as cracks, water intrusion, and settlement that affect the entire home.

Question 59: What is the correct installation sequence for pipe boot (plumbing stack) flashing?

Install boot only on low-slope roofs
Install boot over shingles below, then shingle over the top portion of the boot (Correct answer)
Install boot under all surrounding shingles
Caulk the pipe penetration without a boot flashing

Correct answer: Install boot over shingles below, then shingle over the top portion of the boot

Pipe boots are installed so shingles below overlap the boot's base, while shingles above slide under the top of the boot flange to create a water-shedding overlap.

Question 60: A home inspector notices the furnace flue pipe has a downward slope toward the furnace. What is the concern?

It reduces heating efficiency only
Condensation will damage the heat exchanger
The pipe will overheat and warp
Combustion gases may backdraft into the living space (Correct answer)

Correct answer: Combustion gases may backdraft into the living space

Flue pipes must slope upward (minimum 1/4 inch per foot) toward the chimney so combustion gases draft properly and do not back-flow into the home.

Question 61: A furnace located in a bedroom closet requires combustion air. What is the most common compliant solution for this confined space?

Installing a larger return air grille in the closet door
Providing two openings connecting to the outdoors or to adjacent spaces with adequate volume
Using a sealed-combustion (direct-vent) appliance that draws combustion air from outside (Correct answer)
Leaving the closet door open during furnace operation

Correct answer: Using a sealed-combustion (direct-vent) appliance that draws combustion air from outside

A sealed-combustion furnace draws all combustion air directly from outdoors through a dedicated pipe, making it ideal for confined installations.

Question 62: Which condition requires reporting as a safety defect when inspecting a gas furnace's gas supply line?

A flexible connector longer than 3 feet inside a confined space (Correct answer)
Sediment trap installed in the supply line
Shutoff valve located within 6 feet of the furnace
Black iron pipe used for the main supply

Correct answer: A flexible connector longer than 3 feet inside a confined space

Flexible gas connectors must not exceed the manufacturer's specified length (typically 3–6 feet) and should not pass through walls, floors, or ceilings.

Question 63: What is the primary purpose of roof crickets or saddles?

To divert water around chimney bases (Correct answer)
To support ridge caps
To anchor ridge vents
To reinforce valley flashing

Correct answer: To divert water around chimney bases

Crickets (saddles) are small peaked structures built behind wide chimneys to divert water around the chimney base and prevent ponding.

Question 64: A home inspector observes a 4-inch cast iron soil stack that has significant horizontal crackling and scaling on its exterior. What is the recommended action?

Note it as a material deficiency and recommend evaluation by a licensed plumber (Correct answer)
Replace only the visible section
This is normal aging and requires no action
Apply a sealant coat immediately

Correct answer: Note it as a material deficiency and recommend evaluation by a licensed plumber

Exterior scaling and cracking of cast iron indicates corrosion and potential structural failure; a licensed plumber should evaluate for replacement.

Question 65: What is the term for the horizontal boards or sheet material that form the outer covering of a roof to which shingles are attached?

Fascia
Soffit
Purlins
Roof deck (sheathing) (Correct answer)

Correct answer: Roof deck (sheathing)

The roof deck or sheathing is the structural surface (typically OSB or plywood) fastened to the rafters over which underlayment and shingles are applied.

Question 66: Which of the following window defects is considered a safety hazard in rooms used as sleeping areas?

Cracked window sill paint
Broken window screen
Windows that do not open at least 5.7 square feet (Correct answer)
Fogged dual-pane glazing

Correct answer: Windows that do not open at least 5.7 square feet

Egress windows in sleeping rooms must provide a minimum 5.7 sq ft net clear opening so occupants can escape in an emergency.

Question 67: Why is it a hazard when junction boxes are left without covers inside a wall cavity?

Open boxes reduce circuit ampacity by 10%
The wires will lose voltage without a cover
Exposed wire connections can arc and ignite nearby combustible framing (Correct answer)
Uncovered boxes allow vermin to nest in the panel

Correct answer: Exposed wire connections can arc and ignite nearby combustible framing

Covers contain any arcing or heat from connections; without them, a failing splice can directly ignite wood framing.

Question 68: What does the term 'flashing' refer to in the context of a home inspection?

A roof vent with a rotating cap
Reflective attic insulation
Exposed wiring insulation
Thin metal or membrane strips that direct water away from joints and penetrations (Correct answer)

Correct answer: Thin metal or membrane strips that direct water away from joints and penetrations

Flashing is sheet metal or membrane material installed at roof intersections, chimneys, skylights, and other penetrations to prevent water infiltration.

Question 69: What is the purpose of a ground fault circuit interrupter (GFCI) outlet in a home?

To provide backup power during outages
To prevent power surges from damaging appliances
To regulate voltage to 110V in older homes
To cut power quickly when it detects an imbalance indicating a ground fault (Correct answer)

Correct answer: To cut power quickly when it detects an imbalance indicating a ground fault

GFCIs monitor current flow and trip within milliseconds when a ground fault is detected, preventing electric shock.

Question 70: When inspecting chimney flashing, which defect is most likely to result in water damage to the home interior?

Flashing that extends more than 4 inches up the chimney face
Flashing that is thicker than industry standard
Gaps, improper overlap, or failed sealant at the chimney-to-roof interface (Correct answer)
Use of aluminum flashing instead of copper

Correct answer: Gaps, improper overlap, or failed sealant at the chimney-to-roof interface

Gaps or failed seals at the chimney-roof interface allow water to penetrate directly into the attic and wall cavities, causing significant structural damage.

Question 71: What is suggested for polyurethane foam roofing repairs?

Elastomeric caulking (Correct answer)
Safety glazed
Isolate
Barometric damper

Correct answer: Elastomeric caulking

Polyurethane foam roofing is a flexible system that requires repair materials capable of accommodating movement without cracking. Elastomeric caulking is specifically designed for this purpose, providing a durable, waterproof, and flexible seal for cracks, punctures, or seams in foam roofing. Its elastic properties ensure the repair remains intact as the roof expands and contracts.

Question 72: A contractor has installed a water heater as an extra weight to a wood truss. Under what conditions does the IRC permit this?

None of the above
This is allowed only if the additional load has been verified as acceptable by a certified engineer (Correct answer)
This is never allowed
This is always allowed

Correct answer: This is allowed only if the additional load has been verified as acceptable by a certified engineer

Wood trusses are engineered components designed to support specific loads and configurations. Adding significant extra weight, such as a water heater, can compromise the structural integrity of the truss system. The International Residential Code (IRC) permits such modifications only if the additional load and its impact on the truss have been verified and approved by a qualified design professional, such as a certified engineer, to ensure safety.

Question 73: What is the purpose of an ice and water shield membrane?

To provide a slip-resistant surface for roofers
To increase wind resistance of shingles
To prevent water infiltration from ice dams and wind-driven rain (Correct answer)
To add a reflective layer for energy efficiency

Correct answer: To prevent water infiltration from ice dams and wind-driven rain

Ice and water shield is a self-adhering membrane installed at eaves and valleys to block water from ice dams and wind-driven rain from entering the structure.

Question 74: Please indicate the window-related component of the house inspection report that is NOT required to be remarked on:

The condition of window screens
The condition of window treatments (Correct answer)
The absence of window panes
The absence of window screens

Correct answer: The condition of window treatments

Home inspectors are generally concerned with the functional components of windows, such as the presence of panes, screens, and the overall condition of the window unit itself (e.g., operational issues, seals). Window treatments like blinds or curtains are considered personal property or decorative items and are outside the scope of a standard home inspection.

Question 75: Which roof covering material is most susceptible to damage from foot traffic during an inspection?

Clay or concrete tiles (Correct answer)
Built-up roofing membrane
Metal standing seam panels
Asphalt shingles

Correct answer: Clay or concrete tiles

Clay and concrete roof tiles are brittle and crack easily underfoot, so inspectors should avoid walking on them and use binoculars or a drone when possible.

Question 76: Which of the following is a sign that bathroom exhaust fans are NOT properly vented?

Fan has a backdraft damper
Fan runs loudly
Moisture staining or mold near the fan or in the attic above (Correct answer)
Fan is ENERGY STAR rated

Correct answer: Moisture staining or mold near the fan or in the attic above

Moisture staining or mold near the exhaust fan or in the attic directly above indicates the fan is terminating in the attic rather than venting to the exterior.

Question 77: During a home inspection, the inspector tests all drains and finds that the kitchen sink drains slowly while all other fixtures drain normally. What is the most likely cause?

The vent stack is completely blocked
The main sewer line is partially blocked
The kitchen drain pipe is undersized
There is a localized blockage in the kitchen sink drain or trap (Correct answer)

Correct answer: There is a localized blockage in the kitchen sink drain or trap

A slow drain isolated to one fixture points to a local clog in that fixture's trap or branch drain rather than a main line or vent issue.

Question 78: What is the minimum required headroom clearance on a stairway according to most residential building codes?

6 feet 8 inches (Correct answer)
6 feet 6 inches
6 feet
7 feet

Correct answer: 6 feet 8 inches

Residential building codes typically require a minimum of 6 feet 8 inches of headroom measured vertically from the stair nosing to any obstruction above.

Question 79: During a home inspection, the inspector observes that wood structural members in the crawl space show evidence of wood-boring beetle activity. Which sign BEST distinguishes active infestation from old, inactive damage?

Darkened exit holes always mean the infestation is currently active
Fresh, powdery frass and clean exit holes indicate active beetles (Correct answer)
Any exit holes in lumber indicate an active infestation
Beetle damage is always active unless chemically treated

Correct answer: Fresh, powdery frass and clean exit holes indicate active beetles

Fresh, fine powdery frass and bright, clean-edged exit holes indicate active wood-boring beetles, while old holes are typically darker and lack fresh frass.

Question 80: When inspecting a clay tile roof, a home inspector finds several cracked tiles. What is the most appropriate recommendation?

Have a qualified roofer replace cracked tiles promptly (Correct answer)
Seal cracks with roofing caulk as a permanent fix
Replace the entire roof immediately
Monitor cracks annually without immediate action

Correct answer: Have a qualified roofer replace cracked tiles promptly

Cracked clay tiles should be replaced by a qualified roofer because cracks allow water infiltration that can damage the underlayment and structure below.

Question 81: What is the primary purpose of an HVAC system's air filter?

To cool the air in the summer
To remove odors from the air
To add humidity to the air
To remove dust and debris from the air (Correct answer)

Correct answer: To remove dust and debris from the air

The air filter in an HVAC system helps trap dust, debris, and allergens, improving indoor air quality and protecting the system's components.

Question 82: A home inspector finds that the rim joist (band joist) around the perimeter of a floor system has multiple large holes cut through it for plumbing and electrical runs. What structural concern does this raise?

Rim joists are non-structural and holes have no impact on the floor system
The rim joist provides lateral support to floor joist ends and resists shear; large holes reduce its effectiveness (Correct answer)
The concern is limited to energy efficiency, as holes allow air infiltration
Holes are acceptable in rim joists because floor joists carry all the shear loads

Correct answer: The rim joist provides lateral support to floor joist ends and resists shear; large holes reduce its effectiveness

The rim joist caps the floor joist ends, provides diaphragm shear continuity, and resists lateral forces; penetrations weaken this element.

Question 83: Which condition is considered a defect when inspecting a P-trap under a bathroom sink?

The trap outlet is higher than the trap inlet (Correct answer)
The trap is made of PVC
The trap has a clean-out plug
The trap is located within 24 inches of the vent

Correct answer: The trap outlet is higher than the trap inlet

A P-trap outlet higher than the inlet creates a 'S-trap' condition that allows siphoning and loss of the water seal.

Question 84: When inspecting an older home, a home inspector observes that the floor joists rest directly on the foundation sill plate but no metal anchor bolts are visible at the sill. What hazard does this present?

Anchor bolts are only required in seismic zones and are cosmetic elsewhere
Lack of anchor bolts causes moisture to wick into the sill plate
The floor and wall framing can slide or lift off the foundation during high winds or seismic events (Correct answer)
Without anchor bolts, floor joists will sag prematurely due to settlement

Correct answer: The floor and wall framing can slide or lift off the foundation during high winds or seismic events

Anchor bolts connect the sill plate to the foundation, preventing the entire structure from sliding or lifting off during lateral forces such as wind or earthquakes.

Question 85: Please mark the appropriate way of giving one's findings to a client after the completion of the home inspection:

Any of the above (Correct answer)
Verbally and in a written report
In a written report including photographs
In a written report

Correct answer: Any of the above

While a written report is standard and often legally required, providing findings verbally, especially immediately after the inspection, can help clarify issues for the client. Including photographs in the written report significantly enhances clarity and documentation. Therefore, a combination of these methods or any one of them (depending on specific regulations and client preference) can be appropriate for delivering findings.

Question 86: What is the minimum recommended clearance between a gas furnace and combustible materials in a typical residential installation?

6 inches
1 inch
18 inches
Varies by manufacturer — always check the nameplate (Correct answer)

Correct answer: Varies by manufacturer — always check the nameplate

Clearance requirements vary by furnace model and must be verified on the manufacturer's nameplate or installation manual.

Question 87: What is the term for the triangular roof shape formed when two gable roofs intersect at a right angle?

Gambrel junction
Intersecting gable (cross gable) (Correct answer)
Hip roof junction
Mansard roof

Correct answer: Intersecting gable (cross gable)

An intersecting or cross-gable roof is formed when two gable roof sections meet perpendicularly, creating a valley where they intersect.

Question 88: An inspector finds a furnace filter that is heavily clogged with debris. What is the most likely consequence if left uncorrected?

The thermostat will not call for heat
Increased gas pressure at the burners
The igniter will fail to reach ignition temperature
Reduced airflow causing overheating and possible heat exchanger damage (Correct answer)

Correct answer: Reduced airflow causing overheating and possible heat exchanger damage

A severely restricted filter reduces airflow across the heat exchanger, causing it to overheat, which can trigger the limit switch and over time crack the heat exchanger.

Question 89: The thermocouple or flame sensor in a gas furnace is designed to do what if it fails to detect a flame?

Signal the control board to lock out and stop gas flow (Correct answer)
Open the main gas valve wider
Increase gas flow to relight the burner
Activate the draft inducer to purge the combustion chamber

Correct answer: Signal the control board to lock out and stop gas flow

The flame sensor sends a signal proving ignition; if it fails to sense a flame within a set period, the control board shuts off the gas valve to prevent unburned gas accumulation.

Question 90: When inspecting a high-efficiency condensing furnace, the inspector finds the PVC vent pipe is not supported and sags between connection points. Why is this a defect?

Condensing furnaces do not require venting
Sagging can allow condensate to pool and block flue gas flow (Correct answer)
PVC pipe must be replaced with metal for all furnace applications
The pipe diameter is likely incorrect for the furnace BTU rating

Correct answer: Sagging can allow condensate to pool and block flue gas flow

Condensing furnace vent pipes must be properly supported and pitched to drain condensate; sagging creates traps that can block the flue and cause the furnace to shut down or back-draft.

Question 91: What does the term 'AFUE' stand for, and what does it measure?

Annual Fuel Utilization Efficiency — the percentage of fuel energy converted to heat (Correct answer)
Approved Furnace Utility Emissions — EPA carbon output standard
Annual Fuel Usage Estimate — the yearly cost of operating the furnace
Airflow Filtration and Duct Unit Efficiency — duct system leakage rating

Correct answer: Annual Fuel Utilization Efficiency — the percentage of fuel energy converted to heat

AFUE measures what percentage of fuel energy the furnace converts to usable heat over an entire heating season; a 95 AFUE furnace wastes only 5% of fuel.

Question 92: A home inspector tests the furnace and notices it cycles on and off very frequently without reaching the setpoint temperature. This is called:

Short cycling (Correct answer)
Delayed ignition
Downfiring
Rollout

Correct answer: Short cycling

Short cycling occurs when the furnace turns on and off more frequently than normal, often due to overheating, a dirty filter, or a faulty limit switch.

Question 93: Which of the following would NOT be considered a component of a residential Drain-Waste-Vent (DWV) system?

P-trap under a kitchen sink.
Horizontal cast iron soil pipe in the crawlspace.
Vent stack terminating through the roof.
Pressure relief valve on a water heater. (Correct answer)

Correct answer: Pressure relief valve on a water heater.

A DWV system is comprised of all the piping that removes sewage and greywater from a home. This includes drain lines, waste stacks, P-traps, and vent stacks. A pressure relief valve is a safety device for a pressurized vessel, like a water heater, and is part of the potable water supply system, not the gravity-fed DWV system.

Question 94: What does it mean when a home inspector finds reversed polarity on an outlet?

The outlet is wired with hot and neutral conductors swapped (Correct answer)
The outlet has no ground connection
The breaker amperage is too low for the circuit
The outlet has two hot wires and no neutral

Correct answer: The outlet is wired with hot and neutral conductors swapped

Reversed polarity places voltage on the neutral slot, leaving lamp sockets and switch-leg conductors energized when the device is off, creating shock risk.

Question 95: A home built in 1965 has ungrounded two-prong outlets throughout. A seller has replaced some with three-prong outlets without rewiring. What should the inspector note?

The added third prong is a false ground unless the circuit was rewired or a GFCI outlet was installed and labeled 'No Equipment Ground' (Correct answer)
Two-prong outlets must be replaced with three-prong outlets by law
The seller's upgrade is acceptable if done by a homeowner
Three-prong outlets are safe regardless of whether a ground wire exists

Correct answer: The added third prong is a false ground unless the circuit was rewired or a GFCI outlet was installed and labeled 'No Equipment Ground'

Installing a three-prong outlet on an ungrounded circuit creates a false sense of safety unless GFCI protection is added and the outlet labeled as having no equipment ground.

Question 96: What is the purpose of a ground fault circuit interrupter (GFCI) outlet?

To provide extra power to appliances
To protect against electrical fires
To prevent electric shocks (Correct answer)
To prevent overloading circuits

Correct answer: To prevent electric shocks

A Ground Fault Circuit Interrupter (GFCI) outlet is a critical safety device designed to protect individuals from severe electric shocks. It rapidly detects even small imbalances in the electrical current (ground faults) that indicate current leakage, and quickly shuts off power. This rapid response prevents potentially fatal shocks, especially in areas where water and electricity might mix, such as bathrooms, kitchens, and outdoor outlets.

Question 97: When inspecting a slate roof, which deficiency is considered most serious?

Slight variation in slate color across the roof
Small efflorescence deposits at mortar joints
Slipped, broken, or missing slates exposing the felt underlayment (Correct answer)
Minor surface staining from algae

Correct answer: Slipped, broken, or missing slates exposing the felt underlayment

Slipped, broken, or missing slates expose the underlayment directly to weather; the felt degrades quickly without the protective slate layer, leading to leaks.

Question 98: What is the recommended slope for a residential lot to ensure proper drainage?

45 degrees
2 percent (Correct answer)
90 degrees
30 degrees

Correct answer: 2 percent

A slope of around 2 percent (approximately 1/4 inch per foot) is commonly recommended for residential lots to facilitate proper drainage and prevent water accumulation.

Question 99: Please indicate which of the following is NOT necessary when filling out a report on a home inspection:

Comments on cosmetic features
An opinion of property location
Analysis of geological hazards
All of the above (Correct answer)

Correct answer: All of the above

Home inspection reports focus on the condition of the home's systems and components, identifying material defects. They typically do not include analysis of geological hazards, opinions on property location, or extensive comments on cosmetic features, as these fall outside the scope of a standard home inspection. Therefore, none of these are necessary inclusions.

Question 100: Which type of vent connects a fixture drain to the main vent stack without requiring its own separate vent pipe penetrating the roof?

Circuit vent
Wet vent (Correct answer)
Relief vent
Individual vent

Correct answer: Wet vent

A wet vent serves as both a drain and a vent for one fixture while providing venting for another, reducing the number of roof penetrations needed.

Question 101: When inspecting a factory-built prefabricated fireplace, what is the most critical defect a home inspector looks for?

Use of metal components instead of refractory masonry materials
Use of factory components rather than custom-fabricated parts
Missing clearances, damaged firebox panels, or unapproved modifications to the unit (Correct answer)
Installation of the unit on an exterior rather than interior wall

Correct answer: Missing clearances, damaged firebox panels, or unapproved modifications to the unit

Prefabricated fireplaces must maintain manufacturer-specified clearances and use approved components; damaged refractory panels or field modifications create serious fire hazards.

Question 102: You are looking over a residence. Each system component that is easily accessible must be observed and tested. Which of the following is not regarded as a feature that is easily accessible in a room?

The doorknob on the closet door
Nails or screws in the floor (Correct answer)
None of the above
A small window

Correct answer: Nails or screws in the floor

Home inspectors are required to observe and test readily accessible components of a residence. Easily accessible features include items that can be seen, operated, or tested without requiring tools or destructive methods, such as windows, doors, and visible fixtures. Nails or screws embedded in the floor are part of the building's structure or finish and are not considered easily accessible for routine inspection or testing.

Question 103: When inspecting a crawl space, what minimum clearance height is generally required between the ground and the floor joists?

24 inches
36 inches
12 inches
18 inches (Correct answer)

Correct answer: 18 inches

Most building codes and inspection standards require at least 18 inches of clearance in crawl spaces to allow for adequate access and moisture management.

Question 104: A home inspector notices that a load-bearing stud wall has been framed with 2x3 studs instead of 2x4 studs at 16 inches on center. What is the PRIMARY structural concern?

2x3 studs are only a concern if they are more than 8 feet tall
2x3 studs have significantly less load-carrying capacity and are not typically permitted for load-bearing walls (Correct answer)
2x3 studs are acceptable if the wall uses metal hangers at each joist
The main issue is that 2x3 studs cannot accept standard electrical boxes

Correct answer: 2x3 studs have significantly less load-carrying capacity and are not typically permitted for load-bearing walls

2x3 studs have substantially reduced cross-sectional area and column strength, making them inadequate for load-bearing applications under most building codes.

Question 105: When a home inspector operates the furnace and notices a strong smell of aldehydes or a sharp acrid odor from the supply registers, what should be suspected?

An oversized furnace for the space
A dirty air filter
A cracked heat exchanger allowing combustion gases into the airstream (Correct answer)
Duct leakage pulling in attic air

Correct answer: A cracked heat exchanger allowing combustion gases into the airstream

Aldehydes and acrid odors in supply air during furnace operation are classic indicators of a compromised heat exchanger leaking combustion gases.

Question 106: An inspector observes flexible armored cable (BX/AC) entering a panel without a proper connector. What is the hazard?

The cable will carry too much current
The armor prevents proper grounding of the panel
The cable will reduce panel voltage
The sharp metal armor edge can cut into wire insulation, causing a short or fire (Correct answer)

Correct answer: The sharp metal armor edge can cut into wire insulation, causing a short or fire

Without an anti-short bushing and proper connector, the cut metal armor edge can abrade wire insulation over time, creating a fault or fire.

Question 107: Every wall, fixture, or door must have at least ____ of clearance in front of the toilet.

48
21 (Correct answer)
7
4

Correct answer: 21

Building codes, including the International Residential Code (IRC), specify minimum clearances around plumbing fixtures to ensure comfort and accessibility. For a toilet, there must be at least 21 inches of clear space measured from the front edge of the toilet bowl to any opposing wall, fixture, or door. This ensures adequate room for use and movement within the bathroom.

Question 108: What hazard does improperly rated wire insulation in a high-temperature location (such as inside a luminaire) present?

Wires in luminaires always use the same insulation as branch circuits
High heat only affects aluminum wiring, not copper
Insulation can melt or char, causing a short circuit or fire within the fixture (Correct answer)
High temperature reduces wire resistance, increasing power draw

Correct answer: Insulation can melt or char, causing a short circuit or fire within the fixture

Using standard insulation rated at 60°C in fixtures that reach higher temperatures causes insulation breakdown, leading to shorts and potential fire.

Question 109: According to the '10-2-3 rule,' how high must a chimney extend above any portion of the roof within 10 feet horizontally?

4 feet
1 foot
3 feet
2 feet (Correct answer)

Correct answer: 2 feet

The 10-2-3 rule requires a chimney to extend at least 2 feet above any portion of the roof within 10 feet horizontally, and at least 3 feet above the point where it penetrates the roof.

Question 110: An inspector finds aluminum wiring connected directly to a standard copper-rated outlet. What is the primary hazard?

Aluminum wiring is incompatible with 120V circuits
Aluminum wiring carries too little current
Galvanic corrosion and loose connections can cause arcing and fires (Correct answer)
The wiring insulation will melt immediately

Correct answer: Galvanic corrosion and loose connections can cause arcing and fires

Aluminum and copper expand at different rates, leading to loose connections, oxidation, and arcing that can ignite fires.

Question 111: When should a home inspector recommend air quality testing for radon?

In all homes, particularly in geographic areas known for elevated radon levels (Correct answer)
Only in homes older than 50 years
Only in homes without a basement
Only if the basement smells like sulfur

Correct answer: In all homes, particularly in geographic areas known for elevated radon levels

Radon is a colorless, odorless gas and the second leading cause of lung cancer; testing is recommended especially in high-risk geographic regions.

Question 112: What does a home inspector check when evaluating a sump pump installation?

The electrical panel amperage only
The brand and model number
Only whether the pump turns on
The presence of a pit, functioning float switch, discharge line routing away from the foundation, and a check valve (Correct answer)

Correct answer: The presence of a pit, functioning float switch, discharge line routing away from the foundation, and a check valve

A complete sump pump evaluation includes the pit, float operation, check valve to prevent backflow, and confirming the discharge line terminates well away from the foundation.

Question 113: Which of the following is not a heating system that uses solid fuel?

An electric heater (Correct answer)
A coal furnace
A fireplace
A woodstove

Correct answer: An electric heater

Solid fuel heating systems generate heat by burning solid materials such as wood (e.g., woodstoves, fireplaces) or coal (e.g., coal furnaces). An electric heater, in contrast, operates by converting electrical energy directly into heat through resistance. Therefore, an electric heater does not use solid fuel and belongs to a different category of heating systems.

Question 114: Please indicate the inspection report statement that best fits this description: "Debris and leaves are clogging gutters. Debris must be removed to avoid roof damage."

A correct description of a relationship between components.
Appropriate suggestion for a remedy to correct a problem. (Correct answer)
Inappropriate suggestion for a remedy to correct a problem.
Incorrect description of a relationship between components.

Correct answer: Appropriate suggestion for a remedy to correct a problem.

This statement accurately describes a problem (clogged gutters) and provides a clear, actionable remedy (remove debris) along with the reason for the remedy (avoid roof damage). This is a standard and appropriate way for a home inspector to report findings and offer solutions that guide the client on necessary maintenance or repairs.

Question 115: Please indicate the following for the test for carbon monoxide accumulation that should be performed during a house inspection:

All of the above (Correct answer)
Recommendations if deficiencies are found
Equipment one used to perform the test
Findings of the test in each room tested

Correct answer: All of the above

When performing a carbon monoxide test, a thorough report should include details about the equipment used, the findings for each area tested, and any recommendations if deficiencies are found. This provides a comprehensive record of the test and its implications for client safety, ensuring transparency and proper guidance.

Question 116: A home inspector notes that downspout extensions are missing and gutters discharge directly at the foundation. The primary concern is:

Concentrated water discharge that saturates soil adjacent to the foundation, increasing risk of water intrusion and settlement (Correct answer)
Gutter system aesthetic appearance
Ice dam formation in winter
Splash erosion of landscaping only

Correct answer: Concentrated water discharge that saturates soil adjacent to the foundation, increasing risk of water intrusion and settlement

Gutters without extensions concentrate roof runoff directly at the foundation, overwhelming drainage capacity and increasing hydrostatic pressure and moisture intrusion risk.

Question 117: What is the purpose of a condensate neutralizer on a high-efficiency furnace?

To measure condensate volume for efficiency calculations
To remove mineral deposits from the heat exchanger
To raise the pH of acidic condensate before it enters the drain system (Correct answer)
To prevent condensate from freezing in cold climates

Correct answer: To raise the pH of acidic condensate before it enters the drain system

Condensing furnace condensate is mildly acidic (pH 2.9–6.5) and can corrode drain lines; a neutralizer raises pH to acceptable levels before disposal.

Question 118: When inspecting a crawl space, what clearance between the ground and the bottom of the floor joists is typically required by code?

18 inches (Correct answer)
12 inches
6 inches
24 inches

Correct answer: 18 inches

Most building codes require a minimum of 18 inches of clearance between the ground and the bottom of the floor joists in a crawl space to allow inspection and maintenance access.

Question 119: A home inspector finds that a doubled floor joist supporting a bearing wall above has a large knot located on its tension (bottom) face at mid-span. What is the structural significance?

Knots on the tension face at mid-span are particularly serious because they significantly reduce tensile strength at the highest-stress location (Correct answer)
Knots on the bottom face have no structural significance as long as the wood is dry
A doubled joist compensates for any single knot regardless of size or location
Knots are only a concern on compression members, not tension members

Correct answer: Knots on the tension face at mid-span are particularly serious because they significantly reduce tensile strength at the highest-stress location

The bottom face of a floor joist at mid-span experiences maximum tensile stress, and a knot there acts as a stress concentration that can initiate fracture.

Question 120: Which insulation material has the highest R-value per inch?

Fiberglass batt
Closed-cell spray foam (Correct answer)
Open-cell spray foam
Cellulose

Correct answer: Closed-cell spray foam

Closed-cell spray polyurethane foam achieves approximately R-6 to R-7 per inch, the highest of common insulation types.

Question 121: In wildfire-prone regions, what additional chimney component does a home inspector flag as missing if not present on the chimney cap?

A secondary rain cover installed above the primary chimney cap
A spark arrestor screen to prevent burning embers from escaping the flue (Correct answer)
A wind deflector to improve draft in high-wind conditions
An insulated cap cover to retain heat during cold weather

Correct answer: A spark arrestor screen to prevent burning embers from escaping the flue

In areas with wildfire risk, many state and local codes require spark arrestor screens on chimney caps to prevent burning embers from escaping and igniting nearby vegetation or structures.

Question 122: An inspector finds NM cable (Romex) run through a metal stud without a plastic bushing or grommet. What is the hazard?

Metal studs reduce the cable's ampacity by 50%
NM cable cannot be used in metal-framed walls at all
The cable will corrode where it contacts metal
Sharp metal edges can cut into the cable insulation over time, causing a short or arc fault (Correct answer)

Correct answer: Sharp metal edges can cut into the cable insulation over time, causing a short or arc fault

Metal stud knockouts have sharp edges that can abrade Romex insulation with building movement, eventually causing a fault.

Question 123: A home inspector finds a zero-clearance fireplace connected to a listed double-wall Class A all-fuel chimney. How should this be reported?

Acceptable if the installation meets manufacturer specifications and applicable codes (Correct answer)
A defect, because zero-clearance fireplaces always require a masonry chimney
A defect requiring immediate correction regardless of installation conditions
A defect, because double-wall chimneys cannot be used with zero-clearance fireplaces

Correct answer: Acceptable if the installation meets manufacturer specifications and applicable codes

Zero-clearance fireplaces are commonly and acceptably installed with listed Class A all-fuel chimneys when the installation follows manufacturer specifications and local codes.

Question 124: An inspector in a basement observes a steel support column (lally column) that is not perfectly vertical and shows significant rust and flaking at its base. This condition should be reported as a defect PRIMARILY because:

The column is undersized for the beam it is supporting.
The rust is a cosmetic issue but should be painted.
The concrete floor is likely cracked beneath the column's base plate.
The lean indicates a potential shift in load, and corrosion can significantly reduce the column's load-bearing capacity. (Correct answer)

Correct answer: The lean indicates a potential shift in load, and corrosion can significantly reduce the column's load-bearing capacity.

A leaning or tilted steel column indicates a potential shift in the foundation or the load it supports, which is a serious structural concern. Furthermore, significant rust and flaking, especially at the base where moisture often collects, can severely weaken the steel and compromise its structural integrity and load-bearing capacity, potentially leading to collapse.

Question 125: What is the minimum recommended clearance between the bottom of a wood structural member and the ground in a crawl space?

36 inches
18 inches (Correct answer)
12 inches
6 inches

Correct answer: 18 inches

A minimum of 18 inches of clearance between wood framing and soil in a crawl space is required to prevent moisture damage and pest intrusion.

Question 126: What condition is a home inspector describing when they note 'checks' in dimensional lumber framing members?

Longitudinal surface cracks along the grain caused by uneven drying of the wood (Correct answer)
Insect boring damage along the length of the member
Separation of the wood fibers perpendicular to the grain from overload
Mechanical damage from hammer strikes during installation

Correct answer: Longitudinal surface cracks along the grain caused by uneven drying of the wood

Checks are surface-level cracks running parallel to the grain that develop as lumber dries and shrinks; they are typically acceptable unless they are deep and extensive.

Question 127: Which foundation type is most susceptible to moisture intrusion because it sits partially or fully below grade?

Full or partial basement (Correct answer)
Crawl space with vented foundation
Slab-on-grade
Pier and beam

Correct answer: Full or partial basement

Full and partial basements are below grade and are subject to hydrostatic pressure and water infiltration through walls and floor slabs, making moisture management critical.

Question 128: A plumbing vent runs the danger of ___________ if it rises excessively over the roof line.

Shower
Venting
Flue Liner
Frost Closure (Correct answer)

Correct answer: Frost Closure

If a plumbing vent pipe extends too far above the roof line, it becomes more exposed to cold temperatures and wind. This increased exposure can lead to condensation inside the pipe freezing and accumulating, potentially causing a 'frost closure' that blocks the vent. A blocked vent can lead to plumbing system issues like slow drains, gurgling noises, and sewer gas odors.

Question 129: A home inspector finds that a second-floor bedroom was added above a garage, but the garage door header appears to be a single 2x10. What is the likely concern?

A single 2x10 is typically undersized to carry the additional live and dead loads from the floor above (Correct answer)
A single 2x10 header is standard and adequate for any garage door opening
The concern is fire separation between the garage and living space, not structural
The header material is incorrect; only engineered lumber is allowed over garage openings

Correct answer: A single 2x10 is typically undersized to carry the additional live and dead loads from the floor above

A wide garage opening with an added floor above requires a much larger header or beam to carry the additional loads without excessive deflection.

Question 130: Which roofing condition is described as 'fish-mouthing'?

Granule loss exposing the mat
Moss growth lifting shingle tabs
Shingles with raised lower edges creating an opening (Correct answer)
Cracking along ridge caps

Correct answer: Shingles with raised lower edges creating an opening

Fish-mouthing occurs when the lower edge of a shingle lifts away from the surface below it, creating an open gap resembling a fish's mouth.

Question 131: What is the purpose of 'anti-tip brackets' on a freestanding kitchen range?

To stop the range from tipping forward when a heavy load is placed on an open door (Correct answer)
To prevent the stove from sliding on smooth flooring
To prevent children from turning the front burner knobs
To anchor the range to the gas line during earthquakes

Correct answer: To stop the range from tipping forward when a heavy load is placed on an open door

Anti-tip brackets anchor the rear leg of a freestanding range to prevent the appliance from tipping when someone sits or leans on an open oven door.

Question 132: What is the purpose of a vapor retarder installed on the warm side of insulation?

Improve R-value
Prevent moisture migration into wall or ceiling cavities (Correct answer)
Reduce air infiltration only
Act as a fire barrier

Correct answer: Prevent moisture migration into wall or ceiling cavities

A vapor retarder limits the movement of moisture-laden air from the conditioned space into insulated cavities where it could condense and cause damage.

Question 133: Which of the following materials is commonly used for roof flashing due to its durability, malleability, and corrosion resistance, often developing a distinctive green patina over time?

Aluminum
Galvanized Steel
Copper (Correct answer)
PVC (Polyvinyl Chloride)

Correct answer: Copper

Copper is a premium flashing material known for its long-term durability, excellent malleability for complex shapes, and superior resistance to corrosion. Over time, it develops a characteristic and protective green patina.

Question 134: Why is a missing knockout slug in an electrical panel a deficiency?

It allows pests, moisture, and accidental contact with live components inside the panel (Correct answer)
It prevents proper grounding of the panel enclosure
It voids the breaker warranties
It reduces the panel's amperage rating

Correct answer: It allows pests, moisture, and accidental contact with live components inside the panel

Open knockouts expose live bus bars and wiring to moisture, pests, and accidental touch, creating shock and fire risks.

Question 135: Which type of insulation is most commonly found loose-filled in older attics and may contain asbestos?

Cellulose
Spray foam
Fiberglass batts
Vermiculite (Correct answer)

Correct answer: Vermiculite

Vermiculite insulation, often mined from Libby, Montana, is commonly contaminated with asbestos and was widely used as loose-fill attic insulation.

Question 136: What does a home inspector verify about the non-combustible hearth extension in front of a fireplace opening?

That the hearth is decorative rather than functional in modern homes
That the hearth extends at least 16 inches in front of and 8 inches to each side of the firebox opening (Correct answer)
That the hearth was installed by a licensed contractor
That the hearth tiles match the surrounding floor finish

Correct answer: That the hearth extends at least 16 inches in front of and 8 inches to each side of the firebox opening

Hearth extensions must be non-combustible and extend a minimum of 16 inches forward and 8 inches laterally from the firebox opening to contain sparks and embers.

Question 137: What is the purpose of a weep hole in a brick veneer wall?

Provide a path for electrical conduit
Drain water that collects at the base of the wall cavity (Correct answer)
Improve brick veneer adhesion to the foundation
Allow air circulation behind the brick

Correct answer: Drain water that collects at the base of the wall cavity

Weep holes are open vertical joints at the base of a brick veneer wall that allow any water entering the cavity to drain out rather than accumulate and cause damage.

Question 138: A home inspector observes that a bathroom exhaust fan vents into the attic rather than outside. What deficiency does this represent?

Reduced attic insulation R-value
Reduced bathroom fan noise levels
A building permit violation only
Moisture introduction into the attic, promoting mold and rot (Correct answer)

Correct answer: Moisture introduction into the attic, promoting mold and rot

Bathroom exhaust fans must terminate at an exterior wall, roof cap, or soffit to expel humid air outside; attic termination deposits moisture that can cause structural damage.

Question 139: To what extent should water from the roof drainage system be discharged from the foundation?

>5 ft or into a drain pipe (Correct answer)
>3 ft or into a drain pipe
>2 ft or into a drain pipe
>4 ft or into a drain pipe

Correct answer: >5 ft or into a drain pipe

The distance from the foundation for roof drainage system discharge is often specified by local building codes, and the requirements may vary. However, a common guideline is to discharge the water at least 5 feet away from the foundation. Therefore, among the options provided, the closest one is:>5 ft or into a drain pipe.

Question 140: An online inspector notices standing water visible near the base of the water heater during a video walkthrough. What should be the recommended next step?

Advise the homeowner to wipe up the water and recheck in a week
Note it as cosmetic and move on
Suggest painting the floor to cover staining
Recommend an in-person plumbing inspection immediately (Correct answer)

Correct answer: Recommend an in-person plumbing inspection immediately

Standing water near a water heater can indicate a leak, pressure relief valve failure, or condensation issue requiring hands-on diagnosis.

Question 141: What does the inspector look for to identify a 'split bus' panel, and why can it be confusing?

A panel with two separate bus sections — one fed by a 240V main and one by large breakers — with no single main disconnect, requiring up to six breaker operations to shut off all power (Correct answer)
A panel where breakers are installed horizontally instead of vertically
A panel that has been modified to add a sub-panel inside
A panel where the bus bar is physically broken, indicating damage

Correct answer: A panel with two separate bus sections — one fed by a 240V main and one by large breakers — with no single main disconnect, requiring up to six breaker operations to shut off all power

Split-bus panels predate the single main disconnect rule; inspectors must identify them because multiple breaker operations are needed to de-energize the panel.

Question 142: An inspector observes that a home's main water shutoff valve is a gate valve rather than a ball valve. Why might this be noted as a concern?

Gate valves require annual lubrication
Gate valves can fail to fully close after years of disuse, making them unreliable in an emergency (Correct answer)
Gate valves are incompatible with copper pipe
Gate valves are too large for residential use

Correct answer: Gate valves can fail to fully close after years of disuse, making them unreliable in an emergency

Gate valves corrode internally over time and their stems can seize, meaning they may not fully open or close when needed in an emergency shut-off situation.

Question 143: Following the International Residential Code (IRC), rafters must be secured to ridge boards or gusset plates if the roof pitch is more than or equivalent to a specific angle. What angle is it at?

2/12
5/12
3/12 (Correct answer)
4/12

Correct answer: 3/12

The International Residential Code (IRC) specifies structural requirements for roof framing to ensure stability. Rafters must be securely fastened to the ridge board or gusset plates when the roof pitch is 3/12 or greater. This critical connection prevents the rafters from spreading outwards under the weight of the roof and helps maintain the structural integrity of the roof system.

Question 144: A home inspector observes that a toilet's wax ring seal shows signs of leakage at the floor. Which DWV component is most likely failing?

The soil stack
The trap arm
The closet flange (Correct answer)
The vent pipe

Correct answer: The closet flange

The closet flange connects the toilet to the drain system and supports the wax ring; flange damage or improper height causes wax ring failure and leakage.

Question 145: When inspecting a gas fireplace, what safety device does the home inspector verify is present and operational?

A manually operated damper above the firebox opening
A thermocouple or thermopile that shuts off gas flow if the pilot flame extinguishes (Correct answer)
An electric spark ignition system as the only ignition source
A decorative ceramic log set rated for the BTU output of the unit

Correct answer: A thermocouple or thermopile that shuts off gas flow if the pilot flame extinguishes

A thermocouple or thermopile senses pilot flame presence and interrupts gas flow if the flame goes out, preventing dangerous gas accumulation.

Question 146: Please indicate what should be done if rust is found inside the panel close to the wires during the installation of an electrical service:

One should remove as much of the rust as possible regardless of its location.
One should touch the wires to make sure they are safe to use.
One should describe the findings in their report and recommend an electrician examine the panel. (Correct answer)
Nothing should be done as long as the rust is not on the grounding bar.

Correct answer: One should describe the findings in their report and recommend an electrician examine the panel.

Rust inside an electrical panel, especially near wires, indicates moisture intrusion and potential corrosion, which can compromise safety and system integrity. A home inspector's role is to identify such issues and recommend further evaluation by a qualified professional, like an electrician, rather than attempting to fix it or ignore it. This ensures proper diagnosis and repair.

Question 147: A home inspector finds that insulation is installed against the foundation walls of a conditioned basement but no vapor barrier is present on the soil floor. What should be noted?

A dehumidifier is always an adequate substitute for a vapor barrier
The absence of a floor vapor barrier allows ground moisture to evaporate into the conditioned space, causing humidity problems (Correct answer)
Only the walls need vapor protection in a conditioned basement
This is acceptable — floor vapor barriers are not required in conditioned basements

Correct answer: The absence of a floor vapor barrier allows ground moisture to evaporate into the conditioned space, causing humidity problems

Ground moisture will evaporate through an unprotected concrete slab or soil floor into a conditioned basement, raising humidity levels and promoting mold growth even when walls are insulated.

Question 148: What is a 'cold joint' in a poured concrete foundation wall?

A crack caused by freezing temperatures during curing
A control joint intentionally cut into the slab
The joint between the footing and the foundation wall
A visible seam where two separate concrete pours meet, often a path for water infiltration (Correct answer)

Correct answer: A visible seam where two separate concrete pours meet, often a path for water infiltration

A cold joint forms when fresh concrete is poured against already-hardened concrete without proper bonding, creating a plane of weakness that commonly allows water infiltration.

Question 149: What is a 'hot roof' or unvented roof assembly?

A metal roof in direct sunlight
A roof assembly where insulation fills the entire rafter bay with no ventilation gap (Correct answer)
A roof with dark-colored shingles that absorbs more heat
A roof without ice-and-water shield

Correct answer: A roof assembly where insulation fills the entire rafter bay with no ventilation gap

An unvented (hot roof) assembly uses continuous insulation that fills the rafter cavity, eliminating the need for a ventilation channel because the roof deck stays above the dew point.

Question 150: During an inspection of a home built in 1968, a home inspector identifies solid strand aluminum branch circuit wiring. Which of the following represents the MOST significant hazard associated with this type of wiring?

Aluminum wiring emits a gas that can degrade insulation.
It is incompatible with modern high-amperage appliances.
Connections can loosen over time, leading to overheating and arcing. (Correct answer)
The wiring is prone to breaking during installation.

Correct answer: Connections can loosen over time, leading to overheating and arcing.

Solid strand aluminum wiring has a higher coefficient of thermal expansion than copper. This property, known as "cold creep," causes the wire to expand and contract more with temperature changes. Over time, this can lead to loose connections at terminals (outlets, switches, breakers), which increases resistance, causes overheating, and creates a serious fire hazard from arcing.

Question 151: A home inspector finds insulation installed in a crawl space with the vapor barrier facing down toward the ground. What should be noted?

The insulation R-value is the only concern
The vapor barrier should face upward toward the conditioned space (Correct answer)
Vapor barriers are not needed in crawl spaces
This is acceptable installation

Correct answer: The vapor barrier should face upward toward the conditioned space

In a vented crawl space, batt insulation with the vapor retarder should face up toward the subfloor (warm side) to prevent moisture from the ground from saturating the insulation.

Question 152: What is the purpose of a 'relief vent' in a drainage system?

To allow cleanout access at the base of a stack
To connect two parallel drain stacks
To relieve water pressure in supply lines
To provide additional air circulation to prevent pressure buildup in long horizontal runs (Correct answer)

Correct answer: To provide additional air circulation to prevent pressure buildup in long horizontal runs

A relief vent connects a drain stack to a vent stack partway up to relieve air pressure differentials in tall or complex drainage systems.

Question 153: What is creosote, and why does a home inspector flag its presence as a concern?

A masonry sealant applied to prevent water infiltration
Moisture condensation that accumulates on the flue walls
A chimney liner material that degrades with age
A combustible tar-like deposit from incomplete combustion that can ignite and cause chimney fires (Correct answer)

Correct answer: A combustible tar-like deposit from incomplete combustion that can ignite and cause chimney fires

Creosote is a highly flammable tar-like substance that forms from incomplete combustion and accumulates on flue walls, posing a serious chimney fire risk.

Question 154: What is the purpose of a circuit breaker in an electrical panel?

To prevent overload and short circuits (Correct answer)
To control home security systems
To measure energy usage
To regulate water flow

Correct answer: To prevent overload and short circuits

A circuit breaker is a vital safety device located in an electrical panel designed to protect electrical circuits from damage caused by overcurrent. It automatically interrupts the flow of electricity when an overload or a short circuit occurs. This prevents wires from overheating, which could lead to electrical fires or damage to appliances.

Question 155: A home inspector finds that attic insulation is blocking soffit vents. What is the primary concern?

Pest entry through vents
Restricted attic ventilation leading to moisture and heat buildup (Correct answer)
Fire hazard from insulation contact with wood
Reduced R-value of the insulation

Correct answer: Restricted attic ventilation leading to moisture and heat buildup

Blocked soffit vents prevent proper intake airflow, causing heat and moisture to accumulate in the attic, which can damage sheathing and shorten shingle life.

Question 156: Which condition indicates a Federal Pacific Electric (FPE) Stab-Lok panel is a safety concern?

The panel is surface-mounted rather than flush
Breakers have been documented to fail to trip under overcurrent conditions (Correct answer)
The panel lacks a main disconnect
All breakers are single-pole

Correct answer: Breakers have been documented to fail to trip under overcurrent conditions

FPE Stab-Lok breakers have a documented history of failing to trip, leaving circuits unprotected during overloads.

Question 157: A home inspector observes dark staining on attic rafters and sheathing with no visible roof leaks. What is the most likely cause?

Insect activity
Roof sheathing aging
UV degradation
Inadequate attic ventilation causing condensation (Correct answer)

Correct answer: Inadequate attic ventilation causing condensation

Dark staining on attic wood surfaces without active roof leaks typically indicates condensation from poor ventilation, which promotes mold and mildew growth.

Question 158: What material is NOT acceptable for use as a furnace flue connector in a Category I (negative pressure, non-condensing) gas appliance?

Type B double-wall vent pipe
PVC plastic pipe (Correct answer)
Stainless steel single-wall connector
Single-wall galvanized steel connector pipe

Correct answer: PVC plastic pipe

PVC is only approved for Category IV (positive pressure, condensing) appliances; using it on a Category I furnace is a code violation and safety hazard.

Question 159: What is the primary limitation of an online home inspection compared to an in-person inspection?

Inspector cannot communicate with the client
Inspector cannot physically touch or probe surfaces for hidden defects (Correct answer)
Inspector cannot see the exterior of the home
Inspector cannot review building permits

Correct answer: Inspector cannot physically touch or probe surfaces for hidden defects

Without physical access, an online inspector cannot probe for soft wood, test outlets directly, or detect issues that require tactile assessment.

Question 160: A home inspector should report the absence of tempered or safety glass in which of the following locations?

A sidelight window adjacent to an entry door within 24 inches of the door edge (Correct answer)
A skylight located in a cathedral ceiling
A picture window in the living room that is 5 feet off the floor
A transom window above a kitchen cabinet

Correct answer: A sidelight window adjacent to an entry door within 24 inches of the door edge

Building codes require safety glazing in hazardous locations including sidelight panels within 24 inches of a door, since a person could easily fall into this glass.

Question 161: During an electrical inspection, an inspector finds aluminum wiring used for branch circuits in a home built in the 1970s. What is the primary concern?

Aluminum expands and contracts more than copper, causing loose connections that can overheat and arc (Correct answer)
Aluminum wiring corrodes in humid environments only
Aluminum conducts electricity less efficiently than copper
Aluminum wiring cannot be used with standard breakers

Correct answer: Aluminum expands and contracts more than copper, causing loose connections that can overheat and arc

Aluminum's greater thermal expansion relative to copper causes connection points to loosen over time, increasing resistance, heat, and the risk of fire at outlets and switches.

Question 162: An inspector finds double-tapped breakers in a main electrical panel. Why is this a concern?

Double-tapping is only allowed on 20-amp breakers
It overloads the neutral bus and trips the main breaker
It violates the color-coding requirements for circuits
Multiple wires on a single breaker terminal can cause arcing and overheating (Correct answer)

Correct answer: Multiple wires on a single breaker terminal can cause arcing and overheating

Most breakers are designed for a single conductor; double-tapping can result in poor connections, arcing, and fire risk.

Question 163: What common defect does a home inspector look for in the chimney crown?

Too many coats of waterproof sealant
Excessive mortar thickness causing overhang
Cracks, spalling, or improper slope that allows water infiltration (Correct answer)
A crown that overhangs the chimney cap

Correct answer: Cracks, spalling, or improper slope that allows water infiltration

Cracked or improperly sloped chimney crowns allow water to enter the chimney system, leading to freeze-thaw damage, spalling, and flue liner deterioration.

Question 164: According to NFPA 211 standards, when should a home inspector recommend a Level 2 chimney inspection?

Only when the damper fails to open or close properly
When a real estate transaction occurs or after any change in use, fuel type, or following a chimney fire or event (Correct answer)
Only when visible creosote deposits are present inside the flue
Only for chimneys that are more than 20 years old

Correct answer: When a real estate transaction occurs or after any change in use, fuel type, or following a chimney fire or event

NFPA 211 specifies that a Level 2 inspection is required during real estate transactions and whenever the chimney system has experienced changes in use, fuel, or any event such as a chimney fire.

Question 165: During an attic inspection, a home inspector notices that the roof sheathing is pulling away from the top chord of several trusses. What does this indicate?

Normal thermal expansion of the sheathing panels during summer heat
Sheathing separation is always caused by pest damage to the truss top chord
Truss uplift or inadequate fastening of the sheathing to the truss top chord (Correct answer)
The sheathing was installed with the wrong panel orientation

Correct answer: Truss uplift or inadequate fastening of the sheathing to the truss top chord

Sheathing pulling away from truss chords indicates either insufficient nailing, truss uplift from seasonal wood movement, or structural distress in the truss.

Question 166: Which of the following is a potential safety concern associated with old lead-based paint?

Improved water resistance
Reduced fire resistance
Risk of lead poisoning (Correct answer)
Enhanced color durability

Correct answer: Risk of lead poisoning

Lead-based paint, commonly used in homes built before 1978, poses a significant health hazard, particularly to young children. When the paint deteriorates, chips, or turns into dust, it can be ingested or inhaled, leading to lead poisoning. Lead poisoning can cause severe developmental, neurological, and behavioral problems, making it a serious safety concern.

Question 167: A remote inspector observes white crystalline deposits on a basement wall. What does this most likely indicate?

Evidence of recent professional waterproofing treatment
Normal paint oxidation on concrete
Mineral buildup from a humidifier
Efflorescence caused by water migrating through the masonry wall (Correct answer)

Correct answer: Efflorescence caused by water migrating through the masonry wall

Efflorescence is a white salt deposit left behind when water moves through concrete or masonry, indicating active or past moisture intrusion.

Question 168: A home inspector observes compression wrinkles or 'web buckling' in the thin metal webs of manufactured I-joists (TJI joists). What does this indicate?

The joists have been overloaded or subjected to point loads that exceed their design capacity (Correct answer)
Wrinkled webs only affect acoustic performance, not structural integrity
Web buckling only occurs in wet conditions and self-corrects when the lumber dries
Web wrinkles are a normal manufacturing variation with no structural significance

Correct answer: The joists have been overloaded or subjected to point loads that exceed their design capacity

Web buckling in I-joists indicates the member has been overstressed, compromising its load-carrying capacity and requiring evaluation or replacement.

Question 169: Which of the following furnace components is a safety device designed to shut down the burners if the temperature in the plenum becomes excessively high, preventing damage to the heat exchanger?

Flame rollout switch
Gas valve
High-limit switch (Correct answer)
Pressure switch

Correct answer: High-limit switch

The high-limit switch is a safety control that monitors the temperature inside the furnace plenum. If the temperature exceeds a preset limit, typically due to a dirty filter or a malfunctioning blower motor restricting airflow, the switch will open the circuit to the gas valve, shutting off the burners to prevent the furnace from overheating.

Question 170: What is the minimum recommended R-value for attic insulation in a cold US climate zone (Zone 5–8)?

R-60
R-30
R-19
R-49 (Correct answer)

Correct answer: R-49

The US Department of Energy recommends R-49 to R-60 for attic insulation in cold climate zones 5–8.

Question 171: What liner material does a home inspector expect when a high-efficiency gas furnace has been connected to a previously wood-burning chimney that was relined?

Original clay tile liner left in place
Fiberglass-reinforced concrete liner cast in place
Rigid cast-iron pipe sections
Flexible aluminum or stainless steel liner rated for gas appliance condensate (Correct answer)

Correct answer: Flexible aluminum or stainless steel liner rated for gas appliance condensate

High-efficiency gas appliances produce acidic condensate that rapidly destroys clay liners; a properly rated flexible aluminum or stainless steel liner is required to handle the condensate.

Question 172: What hazard is created when an electrical panel is located inside a clothes closet?

Closet humidity will cause the panel to rust immediately
NEC prohibits panels in closets only if they face the wall
Clothing and stored materials can be ignited by arcing or heat from the panel (Correct answer)
The panel cannot be inspected properly due to darkness

Correct answer: Clothing and stored materials can be ignited by arcing or heat from the panel

NEC prohibits panels in clothes closets because combustible materials stored there create a fire risk from panel arcing or heat.

Question 173: Which electrical panel condition is most difficult to assess accurately during a remote video inspection?

Whether the panel door opens
The number of circuit breakers
The brand name on the panel cover
Heat discoloration or scorch marks on wiring (Correct answer)

Correct answer: Heat discoloration or scorch marks on wiring

Subtle heat discoloration and scorch marks may not be visible over video due to lighting, resolution, and camera angle limitations.

Question 174: What is the correct protocol when an online inspector cannot clearly see a component due to poor video quality or obstruction?

Document it as 'unable to assess' and recommend in-person follow-up (Correct answer)
Mark it as satisfactory to avoid alarming the client
Ask the homeowner to describe it verbally and report it as inspected
Skip it and assume no defect exists

Correct answer: Document it as 'unable to assess' and recommend in-person follow-up

Integrity requires documenting inaccessible or unclear areas honestly, protecting the inspector from liability and ensuring the client gets accurate information.

Question 175: What does a home inspector look for at the furnace's return air plenum connection to identify a potential indoor air quality hazard?

Return plenums should always be located on the supply side of the furnace
The plenum material should be sheet metal, not duct board
Gaps or unsealed connections that could draw in air from unconditioned spaces like crawl spaces or garages (Correct answer)
The plenum should be insulated to at least R-8

Correct answer: Gaps or unsealed connections that could draw in air from unconditioned spaces like crawl spaces or garages

Unsealed return air plenums can draw in mold spores, radon, pesticides, or carbon monoxide from crawl spaces, attics, or garages and distribute them throughout the home.

Question 176: What is the minimum diameter of a building drain that receives discharge from a toilet?

6 inches
4 inches
2 inches
3 inches (Correct answer)

Correct answer: 3 inches

A toilet (water closet) requires a minimum 3-inch drain to accommodate solid waste without clogging.

Question 177: What is the purpose of a Ground Fault Circuit Interrupter (GFCI) outlet?

To protect appliances from power surges
To reduce energy consumption in wet areas
To cut power when it detects current leaking to ground, preventing electrocution (Correct answer)
To regulate voltage fluctuations

Correct answer: To cut power when it detects current leaking to ground, preventing electrocution

A GFCI monitors current flow and trips within milliseconds if it detects even a small leakage path to ground, protecting people from shock in wet locations.

Question 178: What is the purpose of flashing in a roofing system?

To provide additional insulation
To prevent water infiltration (Correct answer)
To create an aesthetic finish
To reflect sunlight

Correct answer: To prevent water infiltration

Flashing consists of thin, impervious materials, typically metal, strategically installed at vulnerable areas of a roof, such as valleys, chimneys, skylights, and wall intersections. Its primary purpose is to divert water away from these critical points, preventing it from penetrating the roof system. This protection is essential to avoid leaks, water damage, and structural deterioration.

Question 179: A home inspector observes that a double top plate in a load-bearing wall is only lapped at one corner of the building. What does this indicate?

Lap joints in the top plate have no structural significance in wood framing
The top plate only needs to be continuous on exterior walls, not interior load-bearing walls
Double top plates only need to be lapped at corners; a single lap per corner is code-compliant
The top plate lap joints must be distributed around the building to tie wall sections together for lateral load transfer (Correct answer)

Correct answer: The top plate lap joints must be distributed around the building to tie wall sections together for lateral load transfer

Top plate laps must be staggered and distributed to continuously tie the wall framing together, transferring lateral forces across the entire perimeter.

Question 180: When conducting a virtual inspection of a bathroom, which area requires the homeowner to hold the camera closest to reveal the most critical information?

The mirror and vanity lighting
The towel bar and toilet paper holder
The ceiling exhaust fan cover
The base of the toilet and around the tub/shower surround (Correct answer)

Correct answer: The base of the toilet and around the tub/shower surround

The toilet base and tub/shower surround are common sites for water damage, caulk failure, and subfloor rot that require close-up video to assess.

Question 181: Which ventilation system type uses a single fan to both exhaust stale air and supply fresh air, balancing pressures in the home?

Exhaust-only ventilation
Natural ventilation
Supply-only ventilation
Balanced ventilation (HRV/ERV) (Correct answer)

Correct answer: Balanced ventilation (HRV/ERV)

Heat Recovery Ventilators (HRV) and Energy Recovery Ventilators (ERV) are balanced systems that simultaneously exhaust stale air and supply fresh outdoor air while transferring heat or energy between the streams.

Question 182: What condition is indicated by scorch marks or char around a breaker in the main panel?

Evidence of arcing or overheating that poses an immediate fire and shock hazard (Correct answer)
Normal discoloration from age and oxidation
The panel needs repainting but is otherwise functional
The breaker was recently reset after a trip

Correct answer: Evidence of arcing or overheating that poses an immediate fire and shock hazard

Char or scorching around a breaker indicates past arcing or sustained overheating, which can damage wiring and panel components and represents a serious fire hazard.

Question 183: A home inspector finds that a steel I-beam used as a basement girder is resting in a pocket in a concrete block foundation wall with only 1 inch of bearing. What is the concern?

One inch of bearing is acceptable for beams carrying only residential floor loads
Steel beams require no minimum bearing length because they distribute load evenly
The concern is corrosion at the pocket, not the bearing length
Inadequate bearing length can cause the beam to slip out of the pocket or crush the masonry beneath it (Correct answer)

Correct answer: Inadequate bearing length can cause the beam to slip out of the pocket or crush the masonry beneath it

Minimum bearing requirements (typically 3.5 inches for steel beams) ensure the concentrated load is distributed over enough masonry area without crushing or slipping.

Question 184: Which document should an online inspector review before conducting a virtual roof inspection to understand potential pre-existing conditions?

The homeowner's mortgage statement
The neighborhood HOA bylaws
The home's listing photos only
Prior inspection reports and maintenance records (Correct answer)

Correct answer: Prior inspection reports and maintenance records

Prior inspection reports and maintenance records reveal known defects, repair history, and conditions that may not be visible through a camera.

Question 185: A home inspector finds that a staircase has no visible structural support (carriage or stringer) on the open side — the treads appear to be only attached to the drywall. What is the concern?

Drywall attachment is acceptable for stairs with fewer than 10 risers
Floating stair designs without stringers are structurally sound if treads are at least 1.5 inches thick
The concern is limited to fire separation between the stairwell and adjacent rooms
Stair treads attached only to drywall lack adequate structural support and create a fall hazard (Correct answer)

Correct answer: Stair treads attached only to drywall lack adequate structural support and create a fall hazard

Stair treads must be supported by structural stringers or carriages; drywall cannot carry the concentrated live loads from foot traffic and represents a serious safety hazard.

Question 186: A home inspector finds that the garage door auto-reverse feature does not activate when the door contacts an object. What should be reported?

A cosmetic issue only
No action needed if the door is less than 10 years old
A normal variation in garage door operation
A safety deficiency requiring correction (Correct answer)

Correct answer: A safety deficiency requiring correction

Auto-reverse is a required safety feature; failure to activate when contacting an object is a serious safety deficiency.

Question 187: Which of the following is an inspector's ethical obligation when a client asks them to overlook a defect to help close a real estate deal?

Skip the item from the report but mention it verbally
Comply if the defect is minor and the client accepts the risk verbally
Transfer the file to another inspector without explanation
Refuse and document all defects accurately regardless of pressure from any party (Correct answer)

Correct answer: Refuse and document all defects accurately regardless of pressure from any party

Home inspectors have a professional and ethical duty to report all observed defects impartially, regardless of pressure from clients, agents, or sellers.

Question 188: What is the primary purpose of a pre-listing online home inspection from the seller's perspective?

To replace the buyer's right to conduct their own inspection
To allow the seller to avoid disclosing known defects
To identify and address defects before listing, potentially speeding up the sale and reducing buyer negotiation leverage (Correct answer)
To lower the home's appraised value for tax purposes

Correct answer: To identify and address defects before listing, potentially speeding up the sale and reducing buyer negotiation leverage

Pre-listing inspections give sellers advance knowledge of defects, allowing repairs that improve buyer confidence and reduce last-minute renegotiation.

Question 189: When inspecting a furnace, the inspector finds no sediment trap (drip leg) on the gas supply line. What is the significance?

A sediment trap is optional if a shutoff valve is present
It is required only on commercial installations, not residential
This only matters for propane systems, not natural gas
Without a sediment trap, debris and moisture can enter gas valve components, causing malfunction (Correct answer)

Correct answer: Without a sediment trap, debris and moisture can enter gas valve components, causing malfunction

A sediment trap (drip leg) catches debris and moisture before they can reach the gas valve or burner orifices; it is required by most codes on all gas appliance connections.

Question 190: What does the term 'cripple stud' refer to in wall framing?

A stud running diagonally for shear resistance
A stud that has been cut or damaged in the field
A doubled stud used to carry extra loads
A short stud above or below a door or window opening (Correct answer)

Correct answer: A short stud above or below a door or window opening

Cripple studs are short vertical members installed above window/door headers or below rough sills to fill framing between openings and top/bottom plates.

Question 191: Which of the following conditions would a home inspector report as a deficiency in chimney flashing?

Counter flashing embedded in mortar joints
Step flashing sealed with caulk instead of being properly lapped (Correct answer)
Flashing painted to match brick color
Use of lead-coated copper flashing

Correct answer: Step flashing sealed with caulk instead of being properly lapped

Step flashing must physically lap over the adjacent shingles — relying solely on caulk is not a proper installation and will fail as sealants degrade.

Question 192: What is the primary purpose of inspecting attic ventilation during a home inspection?

To confirm the attic insulation is the correct color
To check for unauthorized living space conversion
To ensure adequate airflow that prevents moisture buildup and ice dams (Correct answer)
To verify the attic meets fire egress requirements

Correct answer: To ensure adequate airflow that prevents moisture buildup and ice dams

Proper attic ventilation controls moisture and temperature, preventing condensation, mold, wood rot, and ice dam formation.

Question 193: During a winter inspection in a cold climate, you observe a significant ridge of ice along the eaves of a home. This is most likely caused by:

Clogged gutters and downspouts.
Excessively high winds blowing snow onto the roof edge.
Heat loss from the house into the attic, melting snow on the upper roof. (Correct answer)
Lack of a self-adhering ice and water shield membrane.

Correct answer: Heat loss from the house into the attic, melting snow on the upper roof.

Ice dams form when heat escapes from the living space into the attic, warming the underside of the roof deck. This causes snow on the upper portion of the roof to melt. The meltwater then runs down to the colder eaves, where it refreezes, creating a dam of ice.

Question 194: When a home inspector observes that a double-tapped breaker exists in the electrical panel, what does this mean?

A tandem breaker has been correctly installed
The panel has been double-grounded
Two breakers share one bus bar slot
Two circuit wires are connected to a single breaker terminal not rated for it (Correct answer)

Correct answer: Two circuit wires are connected to a single breaker terminal not rated for it

Double-tapping occurs when two conductors are inserted into a breaker terminal designed for only one, creating a poor connection that can cause overheating or arcing.

Question 195: What does 'thermal bridging' refer to in the context of building insulation?

A bridge connecting two insulated walls
The transfer of heat via radiant energy
Heat transfer through a conductive structural element bypassing insulation (Correct answer)
Air movement between insulated cavities

Correct answer: Heat transfer through a conductive structural element bypassing insulation

Thermal bridging occurs when a conductive material like a stud or metal connector creates a path for heat to bypass the insulation layer, reducing overall assembly R-value.

Question 196: What does 'galvanic corrosion' mean in the context of a home inspection?

Corrosion caused by high levels of chlorine in the water supply
Accelerated corrosion when two dissimilar metals are in contact in the presence of an electrolyte (Correct answer)
Chemical breakdown of plastic pipe due to UV exposure
Rust formation on steel fasteners exposed to exterior weather

Correct answer: Accelerated corrosion when two dissimilar metals are in contact in the presence of an electrolyte

Galvanic corrosion occurs when two dissimilar metals like copper and galvanized steel are joined, causing the less noble metal to corrode faster.

Question 197: A home inspector identifies a Built-Up Roofing (BUR) system on a commercial flat roof. When properly installed and maintained with multiple plies, what is the typical life expectancy of this type of roofing system?

5-10 years
40-50 years
10-15 years
20-30 years (Correct answer)

Correct answer: 20-30 years

A properly installed and maintained Built-Up Roofing (BUR) system, which consists of multiple layers of bitumen and reinforcing fabrics, typically has a life expectancy of 20 to 30 years. The number of layers (plies) directly impacts its longevity.

Question 198: What is the main reason home inspectors check for proper clearance between roofing materials and wood siding or trim?

To allow for thermal expansion of metal components
To maintain required fire separation distances
To ensure proper aesthetic appearance
To prevent moisture wicking into wood causing rot at the roof-wall junction (Correct answer)

Correct answer: To prevent moisture wicking into wood causing rot at the roof-wall junction

Direct contact between roofing materials and wood siding traps moisture, promoting rot and decay at the critical roof-wall junction.

Question 199: What roofing feature is designed to allow hot air to escape from an attic space at the highest point of the roof?

Gable vents
Soffit vents
Powered attic fans
Ridge vents (Correct answer)

Correct answer: Ridge vents

Ridge vents run along the peak of the roof, allowing hot air that rises to the apex of the attic to exhaust continuously.

Question 200: What is 'efflorescence' and what does it indicate to a home inspector?

White mineral deposits on masonry surfaces indicating water migration through the wall (Correct answer)
A type of foundation repair epoxy
Spalling caused by freeze-thaw cycles
Black mold on basement walls

Correct answer: White mineral deposits on masonry surfaces indicating water migration through the wall

Efflorescence is the white crystalline residue left when water carries dissolved salts through masonry and evaporates, indicating past or ongoing moisture intrusion.

National Home Inspector Examination (NHIE)

The NHIE assesses the knowledge and skills required to perform comprehensive home inspections, covering various systems and components of a residential property.

200

Questions

240 min

Time Limit

75%

To Pass

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