Mapei Mapeguard UM Underlayment Membrane (323 sq. ft. Roll)

Mapei Mapeguard UM Underlayment Membrane (323 sq. ft. Roll)

Mapei’s Mapeguard UM is a lightweight uncoupling mat for use under ceramic tile and stone installations and can also work as a waterproofing and vapor-pressure-equalizing underlayment. This versatile underlayment membrane can perform on the most challenging substrate surfaces, such as young concrete and single-layer 3/4″ plywood floors, in both commercial and residential applications. 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.

Features:

• Prevents transmission of in-plane substrate cracks up to 1/8″ (3 mm)
• Recommended for use with polymer-modified mortars
• 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 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
• Light green, translucent color shows mortar coverage under membrane
• Reduced “roll memory” and unique tri-layer construction keep membrane flat
• Easy to cut with standard utility knife
• Chalk and laser lines easily visible on surface
• Mesh-fabric top layer makes it easy to fill cavities with mortar

Suitable Substrates:

• Concrete
• Cement mortar beds, self-leveling underlayment and leveling coats
• Young (green) concrete
• Industry-approved exterior-grade plywood and APA Sturd-I-Floor, Exposure 1 OSB (interior, dry areas only)
• Approved backer units – see manufacturer’s installation guidelines
• Cement terrazzo (properly prepared interior only)
• Existing ceramic tile or stone (properly prepared interior only)
• Radiant-heat systems
• Existing, properly prepared vinyl flooring – vinyl composition tile (VCT), non-cushioned paper-backed/felt-backed sheet vinyl, luxury vinyl tile/plank (LVT/LVP)
• Epoxy terrazzo (with appropriate bond testing – interior only)
• Gypsum underlayment or lightweight concrete