Description:
G.A.P. ASTM 15 D226 Type 1 roofing felt is a widely accepted underlayment product that is manufactured from superior organic felt and is saturated with asphalt.

Documents:
Product Data Sheet

Product Use:
GAP ASTM 15 D226 roofing felt is an underlayment that is applied over the roofing deck before installation of asphalt shingles.

Material Performance:
ASTM D 226 Type 1