Other Skilled Trades Roofing 2 — Questions and Answers
Question 1: Which roofing material is most appropriate for a flat or very low-slope roof?
- 3-tab asphalt shingles
- Cedar shakes
- Built-up roofing (BUR) or modified bitumen (Correct answer)
- Clay tile
Correct answer: Built-up roofing (BUR) or modified bitumen
Built-up roofing (BUR) and modified bitumen membranes are designed for flat and low-slope roofs because they create a continuous waterproof membrane rather than relying on water shedding.
Question 2: What does the term 'headlap' refer to in shingle installation?
- The overlap of shingles along the ridge
- The amount one course of shingles overlaps two courses below it (Correct answer)
- The distance between the drip edge and first shingle course
- The overhang of shingles beyond the fascia
Correct answer: The amount one course of shingles overlaps two courses below it
Headlap is the distance that a shingle overlaps the top edge of shingles two courses below, ensuring triple coverage in the most critical areas of each shingle course.
Question 3: When installing step flashing along a vertical sidewall, each piece of step flashing should be at minimum how wide (on the wall)?
- 2 inches
- 4 inches (Correct answer)
- 6 inches
- 8 inches
Correct answer: 4 inches
Step flashing pieces should extend at least 4 inches up the vertical wall surface to adequately direct water away from the wall-roof junction.
Question 4: What is the correct nailing pattern for standard 3-tab asphalt shingles?
- 2 nails per shingle, one at each end
- 4 nails per shingle in the nail strip zone (Correct answer)
- 6 nails per shingle staggered across the full width
- 3 nails per shingle at 12-inch intervals
Correct answer: 4 nails per shingle in the nail strip zone
Standard installation requires 4 nails per shingle placed within the manufacturer-specified nail strip, which provides adequate holding power without splitting the shingle.
Question 5: A roof ventilation system requires balanced intake and exhaust. Where is intake ventilation typically located?
- Ridge vents
- Soffit vents (Correct answer)
- Gable-end vents
- Power attic fans
Correct answer: Soffit vents
Soffit vents at the eave (low point) serve as intake, drawing cooler outside air in at the bottom while ridge or gable vents exhaust hot air out at the top.
Question 6: What type of roofing nail should be used for most asphalt shingle applications?
- Smooth shank aluminum nails
- Ring-shank or screw-shank galvanized steel nails (Correct answer)
- Stainless steel brad nails
- Copper clout nails
Correct answer: Ring-shank or screw-shank galvanized steel nails
Ring-shank (annular ring) galvanized roofing nails have superior holding power and resist corrosion, making them the standard choice for asphalt shingle installation.
Question 7: How should ice and water shield (self-adhering membrane) be installed on a roof in a cold climate?
- Only at the ridge to prevent ice dams
- Along the eaves and in valleys before underlayment is applied (Correct answer)
- Over the top of all shingles as a final waterproofing layer
- Beneath the roof deck between rafters
Correct answer: Along the eaves and in valleys before underlayment is applied
Ice and water shield is installed at eaves and valleys under all other materials, providing a self-sealing barrier in the areas most vulnerable to ice dam backup and water infiltration.
Other Skilled Trades Roofing 2
Which roofing material is most appropriate for a flat or very low-slope roof?