End laps shall be 4 inches and shall be offset by 6 feet.įor roof slopes from 2 1/ 2 units vertical in 12 units horizontal (2 1/ 2:12), up to 4 units vertical in 12 units horizontal (4:12), underlayment shall be not fewer than two layers applied as follows: starting at the eave, apply a 19-inch strip of underlayment parallel with the eave. 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. 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. End laps shall be 4 inches and shall be offset by 6 feet. For roof slopes of 4 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. TABLE R905.1.1(2) UNDERLAYMENT APPLICATION ROOF COVERINGįor roof slopes from 2 units vertical in 12 units horizontal (2:12), up to 4 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. ![]() TABLE R905.1.1(1) UNDERLAYMENT TYPES ROOF COVERINGĪREAS WHERE WIND DESIGN IS NOT REQUIRED IN ACCORDANCE WITH FIGURE R301.2.1.1ĪREAS WHERE WIND DESIGN IS REQUIRED IN ACCORDANCE WITH FIGURE R301.2.1.1ĪSTM D226 Type I or II ASTM D4869 Type I, II, III or IV ASTM D6757ĪSTM D226 Type II ASTM D4869 Type III or Type IVĪSTM D226 Type II ASTM D2626 Type I ASTM D6380 Class M mineral-surfaced roll roofingĪSTM D226 Type I or II ASTM D4869 Type I, II, III or IVĪSTM D226 Type I ASTM D4869 Type I, II, III or IVĪSTM D4869 Type I, II, III or IV ASTM D6757 Underlayment shall be attached in accordance with Table R905.1.1(3). Underlayment shall be applied in accordance with Table R905.1.1(2) using the application requirements for areas where wind design is not required in accordance with Figure R301.2.1.1. An approved underlayment complying with Table R905.1.1(1) for the applicable roof covering for areas where wind design is not required in accordance with Figure R301.2.1.1 shall be applied over the entire roof over the 4-inch wide (102 mm) membrane strips.
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