ASHI Interiors, Insulation & Ventilation 3 — Questions and Answers
Question 1: An ASHI inspector tests a bedroom window and finds it cannot be opened. From a life-safety perspective, what is the PRIMARY concern?
- Energy loss due to non-operable windows
- Loss of emergency egress in case of fire (Correct answer)
- Reduced natural ventilation and air quality
- Non-compliance with local building aesthetic codes
Correct answer: Loss of emergency egress in case of fire
Sleeping rooms must have at least one operable window or door for emergency egress; a window that cannot open eliminates this required escape route in a fire.
Question 2: What does a home inspector look for when assessing the R-value adequacy of wall insulation without destructive testing?
- Measure the exterior temperature with a laser thermometer
- Check for visible gaps, compression, or moisture damage around outlets and switches (Correct answer)
- Calculate R-value from the home's utility bills
- Verify insulation color matches the manufacturer specification
Correct answer: Check for visible gaps, compression, or moisture damage around outlets and switches
Inspectors can remove outlet cover plates to observe insulation presence, thickness, and condition in wall cavities as a non-destructive indicator of insulation quality.
Question 3: Which ventilation system is MOST effective at maintaining good indoor air quality in a very tight, well-sealed modern home?
- Passive stack ventilation through interior partition walls
- Natural infiltration through gaps in the building envelope
- Mechanical balanced ventilation such as an HRV or ERV (Correct answer)
- Intermittent kitchen and bathroom exhaust fans only
Correct answer: Mechanical balanced ventilation such as an HRV or ERV
A Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV) provides continuous controlled fresh air exchange while recovering energy, making it ideal for tight homes.
Question 4: A home inspector notices that fiberglass batt insulation in the attic is compressed under heavy storage boxes. What is the effect on insulation performance?
- Compression increases density and therefore increases R-value
- Compression reduces the air pockets and significantly lowers R-value (Correct answer)
- Compression has no effect because fiberglass does not rely on air space
- Compression causes fiberglass to off-gas harmful chemicals
Correct answer: Compression reduces the air pockets and significantly lowers R-value
Fiberglass batts rely on trapped air pockets for their thermal resistance; compression eliminates these air spaces and can reduce the effective R-value by 50% or more.
Question 5: An inspector finds that bathroom exhaust fans duct into the attic space rather than to the exterior. What is the MAIN deficiency?
- The fan motor will overheat without exterior airflow
- Moisture-laden air dumped into the attic promotes mold and rot (Correct answer)
- Fan noise will be amplified through the attic structure
- Exhaust odors will enter living spaces through attic bypasses
Correct answer: Moisture-laden air dumped into the attic promotes mold and rot
Bathroom exhaust fans must terminate outside the building; venting into the attic deposits warm, humid air that condenses on cold surfaces, promoting mold growth and wood decay.
Question 6: During an interior inspection, an inspector finds that several interior walls have no insulation and separate the heated living space from an unheated sunroom. What is this classified as?
- A code violation requiring immediate remediation
- A thermal bypass allowing heat loss from the conditioned envelope (Correct answer)
- Normal construction practice for sunroom additions
- An exterior wall condition outside the scope of inspection
Correct answer: A thermal bypass allowing heat loss from the conditioned envelope
Walls separating conditioned from unconditioned space function as thermal boundaries and should be insulated; missing insulation creates a thermal bypass reducing energy efficiency.
Question 7: What condition would cause an inspector to report that a crawl space has inadequate ventilation?
- Presence of a sump pump in the crawl space
- Net free vent area is less than 1/150 of the crawl space floor area (Correct answer)
- Crawl space height exceeds 36 inches
- Vents are located on only two opposing walls
Correct answer: Net free vent area is less than 1/150 of the crawl space floor area
Traditional vented crawl spaces require a net free vent area of at least 1/150 of the crawl space floor area to provide adequate cross-ventilation and moisture control.
ASHI Interiors, Insulation & Ventilation 3
An ASHI inspector tests a bedroom window and finds it cannot be opened.
From a life-safety perspective, what is the PRIMARY concern?