KST Roofing Solutions Slope Builder is a thin-coat cementitious, slurry coating designed for building up low-lying areas in flat and low slope roof systems. When combined with the fluid applied roof system it will provide protective waterproofing solutions over concrete, modified bitumen, BUR, metal, polyurethane foam and most single ply membranes. The Just-add-water formulation creates an easy to use mix that allows for viscosity adjustments needed for various applications.