![]() ![]() Starting at the eave, apply 36-inch-wide sheets of underlayment, overlapping successive sheets 19 inches. TABLE R905.1.1(2) UNDERLAYMENT APPLICATION ROOF COVERINGįor 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 MPHĪSTM D226 Type I ASTM D4869 Type I, II, III or IV ASTM D6757ĪSTM D226 Type II ASTM D4869 Type IV ASTM D6757ĪSTM 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 IV MAXIMUM ULTIMATE DESIGN WIND SPEED, V ult < 140 MPH TABLE R905.1.1(1) UNDERLAYMENT TYPES ROOF COVERING An approved underlayment for the applicable roof covering for maximum ultimate design wind speeds, V ult, less than 140 miles per hour shall be applied over the entire roof over the 4-inch-wide (102 mm) membrane strips.
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