KERDI is the gold standard for shower waterproofing — a thin, pliable polyethylene membrane bonded in thin-set to your substrate before tiling. It creates a continuous waterproof barrier over any surface you can tile: cement board, drywall, concrete block, or existing tile.

This 3'3" width is the standard roll format used for wall waterproofing in showers, tub surrounds, and steam rooms. The fabric face bonds directly to thin-set on both sides — one coat to the wall, tile goes into the second coat. No separate waterproof coat needed.

Pro Tip: KERDI is one of those products where the installation quality varies wildly. The membrane works perfectly when properly embedded in thin-set — but if you stretch it across a gap or press it in dry spots, you've lost the waterproofing. Embed it fully, press it flat, and make sure your corners and pipe penetrations are sealed with KERDI-KERECK corners and KERDI-SEAL collars. Those three details account for 90% of shower leak callbacks.

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