How to install ceramic floor tile: 1. Mix thinset mortar in a bucket to the consistency recommended by the manufacturer. 2. Starting at the reference line cross in the middle of the room, spread the mortar with the thin side of the trowel in areas about 3 feet by 3 feet. Make sure that the reference lines are not obscured. 3. Apply the mortar using the notched side of the trowel held at a 45 degree angle. Comb the mortar in one straight direction to ensure uniform application. 4. Remove excess m