Home Inspector Test Home Inspector Roofing Systems and Materials 2 — Questions and Answers
Question 1: What is the minimum recommended slope for asphalt shingles to prevent water infiltration?
- 2:12 (Correct answer)
- 4:12
- 1:12
- 6:12
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 2: Which type of roofing material is most commonly associated with 'cupping' as a defect?
- Wood shingles
- Asphalt shingles (Correct answer)
- Metal panels
- Clay tiles
Correct answer: Asphalt shingles
Cupping in asphalt shingles occurs when the edges curl upward, typically caused by moisture imbalance or improper ventilation.
Question 3: A home inspector observes granule loss concentrated near the downspouts. What does this most likely indicate?
- Normal weathering from rainfall
- End-of-life shingle deterioration (Correct answer)
- Improper gutter slope
- Wind damage
Correct answer: End-of-life shingle deterioration
Heavy granule accumulation near downspouts indicates the shingles are shedding their protective coating, signaling the end of their useful life.
Question 4: What is the primary purpose of roof crickets or saddles?
- To support ridge caps
- To divert water around chimney bases (Correct answer)
- 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 5: When inspecting a flat roof, a home inspector finds blistering in the membrane. What is the most likely cause?
- UV degradation
- Trapped moisture or air beneath the membrane (Correct answer)
- Improper slope installation
- Thermal expansion of the deck
Correct answer: Trapped moisture or air beneath the membrane
Blistering in flat roof membranes is caused by trapped moisture or air that expands with heat, separating layers of the roofing material.
Question 6: Which flashing material is considered incompatible with copper gutters due to galvanic corrosion?
- Lead flashing
- Aluminum flashing (Correct answer)
- Stainless steel flashing
- Copper flashing
Correct answer: Aluminum flashing
Aluminum and copper create a galvanic couple, accelerating corrosion of the aluminum when they contact each other in the presence of moisture.
Question 7: What does a home inspector look for when assessing roof valley construction?
- Proper shingle color matching
- Open, closed, or woven valley with adequate flashing (Correct answer)
- Number of roofing nails used
- Presence of ridge ventilation
Correct answer: Open, closed, or woven valley with adequate flashing
Valleys are high-volume drainage zones requiring open, closed, or woven construction with proper metal flashing to prevent leaks.
Home Inspector Test Home Inspector Roofing Systems and Materials 2
What is the minimum recommended slope for asphalt shingles to prevent water infiltration?