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A Veteran-Owned Company
A Veteran-Owned Company

Mapeguard UM Underlayment Membrane for Ceramic, Wood and Vinyl Flooring

by Mapei
$91.99 USD
SKU 2850905


  • For waterproofing, crack isolation and vapor pressure-equalizing beneath tile and stone installation
  • Prevents transmission of in-plane substrate cracks up to 1/8" (3 mm)
  • For use with polymer-modified mortars
  • Works on difficult substrates such as green concrete, and single layer 3/4" plywood (with joist spacing up to 19-1/5" on center)
  • Unique cavity design will fill in single pass to create a better bond
  • For residential and commercial use
  • Approved for radiant-heating applications


Mapeguard UM is a tri-layered waterproofing membrane roll that provides uncoupling by absorbing lateral force from the substrate without transferring the force to the tile or stone installation. Mapeguard UM has reduced "roll memory" making it easy to handle and lay flat on a variety of different substrates. Mapeguard UM is a light green, translucent color which allows the user to see the mortar coverage that is being spread onto the membrane.


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