Products / DerbiBase

DerbiBase is an 80 mil (2.0 mm) smooth-surfaced APP modified bitumen membrane designed as a base or ply sheet, mid-reinforced with a heat resistant non-woven fiberglass mat. Performance Roof Systems describes it as a completely waterproof base ply for field and flashings when its side and end laps are heat welded. The product page lists PERMASTIC Cold Adhesive, heat welding or mechanical fastening; the data sheet lists a roll of 66.4 by 39.4 inches weighing 96 lb for 200 square feet of net coverage.