Mapei Ultralite S2 White 25 lb

Ultralite S2 White is a lightweight highly deformable mortar. On paper that is ANSI A118.4HE, A118.11 and A118.15HE, ISO 13007 C2ES2P2. Reckon on 75 to 90 sq ft from a 25 lb bag with a 1/4" x 1/4" square-notch. Step up to a 1/4" x 3/8" square-notch and it drops to 55 to 65 sq ft, which is why the notch matters more than the bag count. You get 30 minutes of open time. Pot life is over 4 hours, with 45 minutes to adjust a tile. Light traffic at 24 to 48 hours and heavy traffic at 7 days. Grout after 24 to 48 hours. Maximum embedded thickness is 3/8", which is thinner than Ultraflex LFT allows. S2 is the more flexible mortar, not the deeper one. Approved substrates are cured concrete, masonry, cement board, exterior-grade plywood indoors, existing tile and terrazzo, and Mapei uncoupling and waterproofing membranes. Keep it off hardwood, OSB, metal, moisture-sensitive stone, resin-backed tile, transparent or translucent glass tile, and pools or spas. S2 is the highest deformability class, which is why this is the one reached for under gauged porcelain panels and over substrates that move. In stock in Mississauga and Barrie.