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The Schluter Kerdi Board is a 1/2-inch waterproofing and vapor-retardant panel for tile installations. It is a rigid board, not a thin sheet, so it does two jobs at once: it builds out the wall and seals it against moisture. The core is modified polyethylene (PEVA) with non-woven polypropylene on both faces to bond thin-set mortar. It suits bathrooms, showers and wet areas where you want a flat, waterproof substrate before tiling. Compared with liquid-applied coatings or thin sheet membranes, it saves a step but costs more and needs Schluter's washers and sealants at seams and fasteners.
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Schluter KERDI-BOARD is a bonded waterproofing and vapor-retardant membrane. It comes in a 48" x 96" size and is used with ceramic and stone tile coverings.
The KERDI membrane is pliable and applied in sheets. It has limited crack-bridging capabilities. Its modified polyethylene (PEVA) core has non-woven polypropylene on both sides, which anchors the membrane in the thin-set mortar.
