Description:
G.A.P. 30 Split felt is a 18” underlayment product that is manufactured from superior quality organic felt that is saturated with asphalt.

Documents:
Product Data Sheet

Product Use:
G.A.P. 30 18” Split underlayment is applied over the roofing deck before installation of Wood shake shingles.

Material Performance:
ASTM D 4869 Type 1