Mapei Mapeguard UM Underlayment Membrane (323 Square Feet)

Mapeguard UM is a premium-performance, lightweight, waterproofing, and vapor-pressure-equalizing underlayment membrane that provides crack suppression for use under ceramic tile and stone installations, for both residential and commercial applications. It is designed to perform over challenging substrates, such as young concrete and single-layer 3/4" (19 mm) plywood subfloors with joist spacing of up to 19.2" (49 cm) in center. The unique 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.

• Prevents transmission of in-plane substrate cracks up to 1/8" (3 mm)
• Lightweight for easy handling and fast installation
• Fast Track Ready™: Approved for use over young (green) concrete and mortar beds
• Time-saving: Embed membrane then install tile immediately
• Engineered cavity design allows easy single-pass filling of the surface core with less mortar
• Uncoupling, waterproofing, and water vapor membrane up to 25 lbs. (11,3 kg) MVER and 100% relative humidity
• Compression resistance to support rolling loads
• Approved for radiant-heating applications
• The light green, translucent color shows mortar coverage under the membrane
• Reduced “roll memory” and unique tri-layer construction keep the membrane flat