Waterproof floors
The subfloor must be a durable and reliable base for costly equipment, tile and natural stone finishing,
particularly for luxurious bathrooms and kitchens. A LEWIS® waterproof floor consists of 16 mm thick LEWIS®
Dovetailed Sheeting and a finishing with fine gravel concrete of = 20 mm. The fine gravel concrete can be
finished monolith flat so that the floor thickness remains limited to 36 mm with a total own weight of
0.618 kN/m2 (61.8 kg/m2)
If LEWIS® Dovetailed Sheeting is finished with a lightweight fine gravel concrete, the total own weight at a floor thickness of 36 mm is only 0.45 kN/m2 (45 kg/m2).
The profile
The profile of LEWIS® Dovetailed Sheeting has optimised geometrics so that the collaboration between the sheet and the fine gravel concrete ensures the floor's highest possible bearing capacity. The dovetail profile also ensures permanent ventilation in the floor cavity. The wood of the lower constructions is able to keep on breathing, which prevents suffocation and wood rot, and vermin will not find breeding ground. There will be no permanent damage in the case of a calamity whereby water penetrates into the floor cavity in spite of all provisions. Natural ventilation ensures that the construction will be entirely dry again within 3 to 4 months maximally. LEWIS® Dovetailed Sheeting has a unique well-closing fitting form that enables plastic concrete mortars and liquid floor screeds to be applied to the sheets without mortar leakages.
Waterproof connection points
Good and durable waterproof connection points are crucial. At the spots of wall and floor connection points, shower drains and any conduits, a waterproof connection point must be made on the LEWIS® concrete floor, using sealing tape + sealing paste.
Under floor Heating
Both water-fed and electric floor heating can be included in a LEWIS® floor onto the dovetailed sheeting. LEWIS® Dovetailed Sheeting should be laid onto the bearing construction loosely. 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 rising work. Depending on the design, conduits may be mounted onto the upper flange of the LEWIS® Dovetailed Sheeting using tape or saddles and parkers.
Ceramic Tiles / Natural Stone / Terrazzo
A LEWIS® floor is an excellent base for applying tiles, natural stone, terrazzo, decorational gravel, etc. onto a wooden bearing construction. By applying a thin concrete floor with LEWIS® Dovetailed Sheeting onto a wooden construction, a durable, rigid, non-springing under floor is created.