RPM Mats are the lightweight alternative to backerboard, saving you time and energy. Thinner installation (RPM = 5/16" vs. Backerboard = 1/2") helping you match up a variety of flooring materials. Thermal Break over concrete slab. Lightweight and durable recyled materials makes RPM Mats simple to use Easy and mess-free to cut with a utility knife right on the job site. Provide a customizable grid to evenly run floor heating wire under floors. Heating wire sits below RPM studs, keeping you off the wire and unable to trip or pull out the heating wire during installation. Reduces risk of damage to heat wire and integrity of floor heating system. Wire stays below trowel level when spreading leveling cement. Can be used with any brand of heat wire.