Underfloor heating

Both water-fed and electric floor heating can be included in a LEWIS floor. LEWIS Dovetailed sheeting should be laid onto the bearing wooden construction loosely (do not fasten!). Because of shrinking and crawling that occur at variable temperatures, it is important that the LEWIS floor is kept about 10 mm free from the perimeter. The underfloor heating pipes can be attached to the top flange of the LEWIS sheeting using tape, self-tapping LEWIS clips or the LEWIS clip rail system, depending on the installation. Reppel recommends a mortar coverage on the UFH pipes of 20-25 mm. With a heating pipe of 16 mm, the total thickness of the LEWIS floor is only 52-57 mm.