How to Lay a Stone Tile Floor

Number the sections, set them aside, then vacuum the floor. Mix a batch of thinset: Use polymer-modified thinset on plywood and unmodified thinset on cement-based substrates. Starting at a corner, spread the mix evenly over a 6-foot section as wide as the membrane, then comb it into long parallel furrows with a ¼-inch notched trowel, as shown.