Flintlastic APP Base T is designed for use as a base ply for APP modified bitumen roofing systems. Flintlastic APP Base T will provide additional strength and improved handling and pliability when used as an anchor set over nailable, non-nailable and insulated substrates or as a first ply. It is suitable for use in the construction of various types of membranes for both new construction and reroofing over a variety of substrates.