Easy to handle and apply
Resists leakage caused by water backup behind ice dams, or from wind-driven rain
Resists cracking, drying out, and rotting
Has a slip resistant embossed surface to maximize traction and safety for installers
Protects under all standard sloped roof coverings such as slate, tile, cedar shakes, metal, and conventional asphalt shingles
Re-roofable as it can be applied over the old underlayment (except for the Grace granular underlayment) in retrofit applications
Isolates metal roof components from new corrosive wood preservatives