Tar Asphalt Products 40 Base Felt Secure Grip40 BASE ...
Tar 40# Base ASTM Secure Grip is an organic 40# base sheet made with No 27 organic felt, manufactured with recyclable cardboard. It is coated on both sides with our weatherproofing grade asphalt, then surfaced with high quality copper slag. 40# Secure Grip is used as an underlayment and also as a base sheet for residential and commercial roofing.