Mapeguard UM 35 [NA] is an uncoupling, crack-isolation, waterproofing and vapor-management membrane made from high-density polyethylene (HDPE) with a rough surface and polypropylene fabric backing. Mapeguard UM 35 [NA] is designed for installing ceramic and stone tile, including over existing noncushioned resilient flooring, ceramic tile and stone tile. 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) on center.
Suitable Substrates: Concrete | Young (green) concrete that is cured and able to suitable to support tile installation traffic as determined by the project design professional, construction manager or general contractor | Cementitious mortar beds, self-leveling underlayment and leveling coats | Industry-approved exterior-grade plywood and APA SturdI-Floor, Exposure 1 OSB (interior, dry areas only). Plywood underlayments must be a Group 1 exterior-grade plywood CC-plugged or better, conforming to APA classification and U.S. Product Standard PS 1-95 or a “SELECT” or (SEL-TF) CANPLY classified exterior-grade plywood conforming to CSA-0121 standard for Douglas fir for direct bond (interior, residential and light commercial floors and countertops in dry conditions only) | Approved backer units – see manufacturer’s installation guidelines | Cement terrazzo (interior only) | Existing ceramic tile or stone (interior only) | Existing vinyl flooring – vinyl composition tile (VCT), non-cushioned paper-backed/felt-backed sheet vinyl and luxury vinyl tile/plank (LVT/LVP) | Epoxy terrazzo (with appropriate bond testing – interior only) | Gypsum underlayment or lightweight concrete (When using Mapeguard UM 35 [NA] over gypsum-based floor patching or leveling compounds, reference Technical Bulletin titled “Tiling over gypsum").
