Prodeso Underfloor Heat System Membrane, PDESH PRODESO HEAT MEMBRANE is a polypropylene uncoupling, crack isolation, waterproofing membrane, with rounded square shaped reliefs. These reliefs form a channel specially designed to embed and hold the heat cables ran under the tiling Uncoupling: Prodeso Heat Membrane compensates for the longitudinal movement between the subfloor and the tile preventing breakage and making it possible to install underfloor electric heating even on problematic substrates such as wood and cracked substrates. Vapor Management: unique and patented design allows for air pockets to form between the subfloor and the membrane itself. A vapor cycle will balance the vapor content of the substrate, protecting the tile from potential damage and making it possible to install underfloor electric heating even on substrates that are not perfectly cured or are moisture sensitive such as wood, concrete, and gypsum based subfloors. Waterproofing: Polypropylene membrane and as such is naturally waterproof. For indoor installations in areas that are prone to water damage such as bathrooms and kitchens, the perimeter, corners, and seams of the Prodeso Heat Membrane need to be waterproofed utilizing PROBAND 150/250 waterproofing foil tape (doublesided Polypropylene foil tape) and modified (ANSI A118.11) or unmodified (ANSI 118.1) thin sets. Load distribution: unique and patented designs allows loads to be evenly distributed from the tile covering to the subfloor. Each rounded square relief has a central cavity shaped like an inverted pyramid. When filled with thin-set this inverted pyramid becomes an incompressible structure.