Henry 604 - 25# Fiberglass Base Sheet is a heavy duty asphalt coated sheet with a heavyweight, non-woven fiberglass mat, suitable for use in fire retardant membrane assemblies, built-up roofing systems, base sheets and ply sheets. It has a coating layer of asphalt on each side that reacts with Henry Cold Application Cement solvents to provide excellent adhesion without decreased tensile strength.

Features:

• Has lay lines appropriate for normal roofing side laps
• Provides coated base and ply sheet for BUR
• Prevents sticking in the roll with sand lightly sprinkled on sheet surface