![]() Cap nail shank and cap staple legs shall have a length sufficient to penetrate through the roof sheathing or not less than 3/ 4 inch into the roof sheathing. The cap nail shank shall be not less than 0.083 inch for ring shank cap nails and 0.091 inch for smooth shank cap nails. Minimum thickness of the outside edge of plastic caps shall be 0.035 inch. Power-driven metal caps shall have a minimum thickness of 0.010 inch. Metal caps shall have a thickness of not less than 32-gage sheet metal. ![]() Underlayment shall be attached using metal or plastic cap nails or cap staples with a nominal cap diameter of not less than 1 inch. The underlayment shall be attached with corrosion-resistant fasteners in a grid pattern of 12 inches between side laps with a 6-inch spacing at the side laps. End laps shall be 4 inches and shall be offset by 6 feet. For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be one layer applied in the following manner: underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 4 inches. ![]() Starting at the eave, apply 36-inch-wide sheets of underlayment, overlapping successive sheets 19 inches, and fastened sufficiently to hold in place. End laps shall be 4 inches and shall be offset by 6 feet.Īpply in accordance with the manufacturer's installation instructions.įor roof slopes from two units vertical in 12 units horizontal (2:12), up to four units vertical in 12 units horizontal (4:12), underlayment shall be two layers applied in the following manner: apply a 19-inch strip of underlayment felt parallel to and starting at the eaves. ![]() For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion, parallel to and starting from the eaves and lapped 2 inches. Starting at the eave, apply 36-inch-wide strips of underlayment felt, overlapping successive sheets 19 inches. Same as Maximum Ultimate Design Wind Speed, V ult < 140 mph except all laps shall be not less than 4 inches.įor roof slopes from two and one-half units vertical in 12 units horizontal (2 1/ 2:12), up to four units vertical in 12 units horizontal (4:12), underlayment shall be a minimum of two layers applied as follows: starting at the eave, apply a 19-inch strip of underlayment parallel with the eave. For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be one layer applied in the following manner: underlayment shall be applied shingle fashion, parallel to and starting from the eave and lapped 2 inches, Distortions in the underlayment shall not interfere with the ability of the shingles to seal. Distortions in the underlayment shall not interfere with the ability of the shingles to seal. Starting at the eave, apply 36-inch-wide sheets of underlayment, overlapping successive sheets 19 inches. MAXIMUM ULTIMATE DESIGN WIND SPEED, V ult ≥ 140 MPHĪSTM D6380 Class M mineral-surfaced roll roofingįor roof slopes from two units vertical in 12 units horizontal (2:12), up to four units vertical in 12 units horizontal (4:12), underlayment shall be two layers applied in the following manner: apply a 19-inch strip of underlayment felt parallel to and starting at the eaves. MAXIMUM ULTIMATE DESIGN WIND SPEED, V ult < 140 MPH
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