CSLB C-39 Roofing ContractorSteep-Slope RoofingEasy
A roofer is installing a new asphalt shingle roof on a residential property. The roof has a standard pitch of 4:12. When nailing the shingles, what is the maximum distance from the shingle's butt edge that the nails should be placed to ensure they are covered by the succeeding course and provide proper fastening?
- A1 1/4 inches
- B3/4 inch
- C5/8 inch
- D1 inch
Show answer & explanationAnswer & explanation
Correct answer: D. 1 inch
For standard asphalt shingles, nails should be placed approximately 1 inch above the shingle's cut-out or butt edge. This ensures they are covered by the headlap of the next course and provide secure fastening.
Why the other options are wrong
- A. 1 1/4 inches is too high; nails might be exposed to the weather, leading to leaks or premature wear.
- B. 3/4 inch is too close to the butt edge and might be visible or less effective in securing the shingle.
- C. 5/8 inch is too close to the butt edge; nails would likely be visible or less effective.
Asphalt Shingle Nailing Vertical Placement
The vertical placement of nails on an asphalt shingle is critical to ensure they are covered by the next course and provide maximum holding power.
- Nails should be placed in the nailing zone, typically 1 inch above the butt edge/cut-out.
- Proper placement prevents exposure to weather and allows for shingle sealing.
- Too high or too low placement can compromise performance.
Memory trick: Nail's height: one inch's might, keeps the shingle tight.