Mapeguard UM is a lightweight waterproofing and vapor pressure-equalizing underlayment membrane from MAPEI. It provides crack suppression for use under ceramic tile and stone installations, for both residential and commercial applications. Mapeguard UM is designed to perform over challenging substrates, such as young concrete and single-layer 3/4-inch plywood subfloors with joist spacing of up to 19.2 inches on center. The uniquely engineered, tri-layered design of Mapeguard UM absorbs lateral stress from the substrate without transferring this force to the tile or stone, which maintains exceptional bonds.

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