PREMIUM MATERIAL - Made of premium Polyethylene & Polypropylene , Our polypropylene composite uncoupling membrane for heated floors provides supreme interior floor warming application. It meets the ASTM International Standards and will definitely keep moisture away. Install with a temperature zone electric floor heating cable and thermostat. WIDELY USED - This 1/4 inch Thick 3.3 FT x 41 FT adiant heated dimple uncoupling membrane can be used with any thinset mortar which can easily be laid on top of wood, OSB, concrete, backer board, cement or cement board, gypsum, both porcelain and ceramicetc. Perfect for your bath, shower, sauna, steam room, master bath, hallways. PERFECT WATERPROOFING LAYER - With high strength material provides strong adhesion and multi-layered waterproof protection this uncoupling membrane can protect moisture-sensitive substrates like wood, metal or asphalt. It also provides sound reduction and control, a thermal break, and vapor barrier. EASY TO USE - This tile underlayment membrane has an easy snap grid that allows heated cable to easily snap into place, while increasing heat retention. No need to wait for the mortar to cure. The underside anchoring fleece allows direct application on various surfaces with any unmodified thin set mortar. Fast, simple and hassle-free! CUSTOMER SERVICE - If your expectations are not met or you encounter any quality problems, please feel free to click "Contact Seller" to contact us, we will contact you as soon as we receive your message, and no more than 24 hours at the latest.