Mapei Ultralite Pro White Mortar 25 lb

This is Ultralite Pro White Mortar, a lightweight polymer-enriched mortar meeting ANSI A118.4HET and A118.11, ISO 13007 C1TES1. A 25 lb bag gets you 75 to 90 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 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 2 hours. Light traffic at 24 to 48 hours, general traffic at 72 hours, heavy traffic at 7 days. Grout after 24 hours. Bond coat from 3/32" up to 1/2". Approved substrates are cured concrete, masonry, cement board, exterior-grade plywood indoors, existing tile and terrazzo, and VCT or cutback residue indoors. Keep it off hardwood, OSB, metal, moisture-sensitive stone, resin-backed tile, and pools or spas. The lightweight body is the point: a 25 lb bag covers what a standard 50 lb bag does, so it is half the weight up a staircase for the same floor. We keep it in Mississauga and Barrie, so you can pick it up with the tile.