water used for mixing: add approx. 24% of water on a part of ISOLCOLL US05 consumption: a 50-lb. bag covers about 75 to 90 square feet with a 1/4†x 1/4†x 1/4†notched trowel, and 55 to 65 square feet with a 1/4†x 3/8†x 1/4†notched trowel floor grouting: ≈ 48 hours set to light foot traffic: ≈ 48 hours ready to use: ≈ 8 days porcelain mosaic tile shear strength: ≥ 1.38 N/mm² glazed wall tile shear strength: ≥ 2.07 N/mm² quarry tile shear strength: ≥ 1.03 N/mm²