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Mapegard UM is an uncoupling membrane, that can be used to waterproof a floor by applying Mapeguard ST sealing tape at the seams and at the floor to wall junction. In this video I explain how this tile underlayment works and how to install it on a plywood subfloor. A polymer modified thinset is used to install the uncoupling membrane to the plywood, the thinset must meet ANSI A 118.11 standards, Mapei Ultraflex 2 is such a thinset and is the one I used in this application. The tile installed on the mat was a large format tile, so I used Mapei Ultraflex LFT as my Mortar. In my opinion, an uncoupling membrane like Mapegard UM is far superior to a cement backer board, which has none of the benefits that Mapegaurd provides such as lightweight, waterproofing and vapor pressure-equalizing as well as crack suppression. It can also be installed on Young concrete and single-layer 3/4" plywood subfloors with joist spacing of up
to 19.2". The design incorporates a surface mesh which is heat welded to the mat, which in conjunction with the cavity design of the mat, makes it easy to fill. All tile installed by Sal DiBlasi, Elite-tile Company, in the Boston North Shore area. This video contains affiliate links, which means I will receive a small commission if you click on the product link.
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