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. 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 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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