MAPEI recently introduced Mapeguard® UM. This crack-suppression, waterproofing and vapor-pressure-equalizing underlayment membrane has been approved for use with latex-modified mortars as part of a warranted system for installation of ceramic tile and natural stone. Mapeguard UM equalizes vapor pressure, so it can be applied over young concrete in fast-track construction or concrete with high relative humidity. The lightweight membrane can also be applied over single-layer plywood floors. 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. The engineered cavity design – including the mesh-fabric top layer – allows easy single-pass filling of the surface core with less mortar, reducing the amount of mortar needed and making the installer’s job easier. www.mapei.com
