General description The Dura Underfloor Heating Membrane Original Heat Mat Decoupling Roll is designed to provide a reliable and effective solution for underfloor heating installations. Manufactured by Isola, this yellow decoupling mat has a proven track record of performance, having been tested and tiled for over fifteen years. This mat creates an isolating layer beneath the tiles, preventing any cracks in the foundation from impacting the tiles above, allowing for installation even on old or problematic foundations.