Mapei Ultraflex L F T Gray 50 lb

Ultraflex L F T Gray is a medium-bed mortar for large format tile. On paper that is ANSI A118.4HET, A118.11 and A118.15HET, ISO 13007 C2TES1P1. A 50 lb bag gets you 85 to 95 sq ft with a 1/4" x 1/4" square-notch. Step up to a 1/4" x 3/8" square-notch and it drops to 65 to 75 sq ft, which is why the notch matters more than the bag count. You get 30 to 35 minutes of open time. Pot life is 4 hours. No foot traffic for 24 to 48 hours, general traffic at 3 days, heavy traffic at 7 days. Grout walls after 8 to 16 hours and floors after 24 hours. It builds a bond coat from 3/32" up to 1/2", which is what makes it a medium bed rather than a thin set. It is approved over cured concrete, masonry, cement board, foam backer board, exterior-grade plywood and existing tile indoors. Keep it off hardwood, OSB, metal, moisture-sensitive stone, resin-backed tile, and transparent or translucent glass tile. Non-sag, so large tile does not slide down a wall while it sets. It does not level an uneven floor though, and the substrate has to be flat first. Both the Mississauga and Barrie stores carry it.