Apa Rated Sheathing 40 20 Exposure 1
Discover the advanced building solutions and high-performance construction materials LP has been delivering to the industry for over 50 years. U When sheathing thicker than 1532 is used under fiber glass-type shingles shingle underlayment is not required for a UL Class A. Rated Sheathing 19 32 In Apa Southern Yellow Pine Syp Rated Sheathing Softwood Plywood Plywood Company Texas FOR FIRE-RATED PREPARED ROOFING u UL classified underlayment is required under Class A fire-resistant shingles when plywood or non-veneer OSB WB etc APA sheathing is at least 38 thick but less than 1532.
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