Torchflex TP-HD-FF-Base Heat Welded Base Sheet is constructed using a tough composite reinforcement of non-woven polyester strengthened with a glass fiber scrim in both machine and cross directions. The mat is coated with SBS polymers and premium quality asphalt both top and bottom. Covered with a thin micro-perforated film on both surfaces, the top film of the product melts during the application to the adjoining heat welded cap sheet while the bottom film dissolves during heat welding to the substrate. Torchflex TP-HD-FF-Base can be used as the “lay-flat” base sheet in a layered membrane construction system.
