Modiflex MP-HD-SS-Base Fully Adhered 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. Coated top and bottom with select SBS polymers and premium quality asphalt, both sides of the product are sand covered to allow application via mopping or an IKO-approved cold process adhesive. Modiflex MP-HD-SS-Base is an excellent choice for the “lay flat” base sheet in a layered membrane construction system.