CSLB C-39 Roofing ContractorSteep-Slope RoofingMedium
A roofer is installing a new asphalt shingle roof on a residential property. The roof has a 5:12 slope. When placing the nails for each shingle, what is the recommended vertical placement from the butt edge of the shingle for proper fastening and wind resistance?
- A5 inches to 6 inches above the butt edge
- B1/2 inch to 1 inch above the butt edge
- C3 inches to 4 inches above the butt edge
- D7 inches to 8 inches above the butt edge
Show answer & explanationAnswer & explanation
Correct answer: A. 5 inches to 6 inches above the butt edge
For standard asphalt shingles, nails should be placed approximately 5 5/8 inches to 6 inches above the butt edge of the shingle. This ensures that the nails penetrate the shingle above the cutout and below the sealing strip, securing both layers effectively.
Why the other options are wrong
- B. Nailing too close to the butt edge would expose the nails and potentially allow water intrusion.
- C. This range is too low; nails would not properly secure the top edge of the shingle below the sealing strip.
- D. Nailing too high (7-8 inches) would place nails above the sealing strip or too close to the top edge, reducing effectiveness.
Asphalt Shingle Nailing Placement
The precise vertical and horizontal positioning of fasteners on an asphalt shingle to ensure proper securement, weather resistance, and wind uplift resistance.
- Crucial for shingle performance.
- Must penetrate both shingle layers.
- Avoids nailing through cutouts or sealing strips.
Memory trick: Five-and-a-half to six, for the shingle to fix.