Home Inspector Test Home Inspector Roofing Systems and Materials 5 — Questions and Answers
Question 1: What does a home inspector look for when evaluating roof ventilation adequacy using the 1:150 rule?
- One square foot of vent area for every 150 square feet of attic floor area without a vapor barrier (Correct answer)
- One vent per 150 linear feet of ridge
- 150 CFM of powered ventilation per 1,000 square feet
- One soffit vent per 150 square feet of roof area
Correct answer: One square foot of vent area for every 150 square feet of attic floor area without a vapor barrier
The 1:150 ratio requires 1 square foot of net free ventilation area for every 150 square feet of attic floor space when no vapor barrier is present.
Question 2: Which condition is a home inspector MOST likely to find in a roof with insufficient attic ventilation?
- Premature shingle aging and potential for ice dam formation (Correct answer)
- Excessive solar reflectance of roofing material
- Structural rafter cracking from wind loads
- Gutter overflow from debris accumulation
Correct answer: Premature shingle aging and potential for ice dam formation
Poor attic ventilation traps heat and moisture, causing shingles to age prematurely from heat below and increasing the risk of ice dams in cold climates.
Question 3: What is the term for the triangular roof shape formed when two gable roofs intersect at a right angle?
- Mansard roof
- Hip roof junction
- Intersecting gable (cross gable) (Correct answer)
- Gambrel junction
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 4: A home inspector finds that roof shingles have been installed over two existing layers of roofing. What concern should be documented?
- Color mismatch between layers
- Excess weight and possible building code violation limiting re-roofing layers (Correct answer)
- Incompatible granule colors affecting heat absorption
- Third layer voids manufacturer warranty only
Correct answer: Excess weight and possible building code violation limiting re-roofing layers
Most building codes limit roofs to two layers of asphalt shingles; a third layer adds excessive weight and prevents proper inspection of the deck.
Question 5: What type of roof damage is most commonly associated with hailstorm events on asphalt shingle roofs?
- Raised shingle tabs from wind uplift
- Bruised or dented shingles with localized granule loss creating soft spots (Correct answer)
- Longitudinal cracking along shingle tabs
- Uniform color fading across the entire roof surface
Correct answer: Bruised or dented shingles with localized granule loss creating soft spots
Hail impact bruises asphalt shingles, knocking off granules and creating soft spots in the mat that accelerate water infiltration and shingle failure.
Question 6: When inspecting a slate roof, which deficiency is considered most serious?
- Minor surface staining from algae
- Slipped, broken, or missing slates exposing the felt underlayment (Correct answer)
- Small efflorescence deposits at mortar joints
- Slight variation in slate color across the roof
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 7: What is the main reason home inspectors check for proper clearance between roofing materials and wood siding or trim?
- To ensure proper aesthetic appearance
- To prevent moisture wicking into wood causing rot at the roof-wall junction (Correct answer)
- To maintain required fire separation distances
- To allow for thermal expansion of metal components
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.
Home Inspector Test Home Inspector Roofing Systems and Materials 5
What does a home inspector look for when evaluating roof ventilation adequacy using the 1:150 rule?