By Gene and Katie Hamilton
Step 1 : Cut and fit cement board panels for subfloor
These panels are difficult to handle so wear leather work gloves and eye protection. Lay out the cement board and cut it to fit the room allowing for a 1/4-inch gap around the perimeter and about 1/8-inch gap between the panels. Use a metal straightedge and a carbide cutter or utility knife and cut the material by scoring it on both sides and then snapping the cut piece with a short snapping motion. Kneel on the panel near the score line and use your weight to lift the edge up to snap it. Wear knee pads to protect your chins.
Step 2 : Secure the cement board with thinset ashesive and screws
Mix thinset adhesive according to the manufacturer's directions and allow it to set. Spread the adhesive with a trowel on the floor one section of cement board at a time. Use a trowel to spread enough adhesive on the floor for one section of cement board, then place the board in position on the thinset.
Then screw the cement board to the underlayment with cement board screws spaced every 4-inches. Install the other panels in the same way.
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