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Kerdi-Board is a waterproof tile substrate: an extruded polystyrene core faced with a cement-free reinforcing layer that bonds directly to thinset. This is the full 4-by-8 sheet at 1/2 inch thick, so it covers a wall section in one piece and cuts with a utility knife instead of a saw. It screws straight to framing with Kerdi-Board screws and washers, and seams are sealed with Kerdi-Band and thinset. Compared with cement board it is far lighter and needs no taping-and-mudding step, but it costs more per sheet and demands Schluter's own fasteners and banding to keep the waterproofing intact.
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Pros and DIYers who use Kerdi-Board praise its light weight and fast installation compared with cement board. Complaints center on the added cost of the proprietary screws, washers and banding and on the care needed to seal seams properly.
Kerdi-Board is a lightweight tile substrate and building panel. It gives tile a flat, dimensionally stable base on walls, floors, and shower surrounds. The core is extruded polystyrene.
The panel is a full 4-by-8 sheet, 1/2 inch thick, 48 inches wide and 96 inches long. It cuts with a utility knife, so it is lighter and less messy to work with than cement board.
To install, fasten the panel to studs with Kerdi-Board screws and washers. Seal the seams with Kerdi-Band and thinset before setting tile.
