Gorilla Guard is a mechanically attached polymeric roof underlayment used in steep slope roofing. Underlayment is manufactured as a woven sheet coated on both sides. Underlayment rolls have approximate dimensions of 250ft x 48in. Underlayment is mechanically attached.
Ratings
ASTM D8257
Product has met specification requirements of ASTM D8257.
ASTM E108 (Fire)
Product has met Class A requirements of ASTM E108 when installed over minimum 3/8in thick APA-rated plywood decks with allowable roof covers of asphalt shingles (ASTM D3462). Slope is unlimited.