CSLB C-39 Roofing ContractorSteep-Slope RoofingEasy
A contractor is installing a new asphalt shingle roof. To ensure proper fastening and prevent blow-offs, how far from the bottom edge of the shingle should the nails be placed?
- A3 inches to 3 1/2 inches
- B1 inch to 1 1/2 inches
- C2 inches to 2 1/2 inches
- D1/2 inch to 3/4 inch
Show answer & explanationAnswer & explanation
Correct answer: B. 1 inch to 1 1/2 inches
Nails for asphalt shingles should be placed 1 inch to 1 1/2 inches above the butt edge (bottom) of the shingle. This placement ensures the nails penetrate the underlying shingle and are covered by the next course.
Why the other options are wrong
- A. Nails placed too high would likely miss critical fastening areas and compromise the roof's integrity.
- C. Nails placed too high might miss the underlying shingle or be too close to the top edge.
- D. Nails placed too low may not hold the shingle securely or may be exposed.
Asphalt Shingle Nailing
Proper nailing of asphalt shingles involves specific placement and quantity of fasteners to ensure wind resistance and watertightness.
- Nails should penetrate through the shingle and decking.
- Placement is critical for wind uplift resistance.
- Incorrect nailing can void warranties.
Memory trick: Nail it right, for a roof that's tight.