How Do You Install Cement Board Around a Bathtub?
Cement board looks and feels something like sheetrock, but is a lot heavier and harder. This is because the board is made with cement instead of gypsum, which gives it a very rigid, immobile surface. Cement board is the preferred backing material today for tiling, since a layer of cement board is almost like installing the tile right on solid concrete, which prevents cracks and resists moisture. When tiling the wall around a tub, the cement board has to be secured directly to wall studs and the seams taped with mortar.
Instructions
1. Use an electronic studfinder to locate each stud in the wall around the tub. Mark the location of each stud, using a level and pencil to draw the vertical lines along the whole span of the wall.
2. Measure the main wall horizontally, at the bottom. Transfer the measurement to a piece of cement board. Also mark on the board the position of the studs, as indicated by your lines on the wall. Cut the board, using your jig saw.
3. Spread thinset mortar over the section of the wall where the board will go, using your notched trowel. Press the board into place. Use your screwgun to sink galvanized screws every foot or so along the lines that you marked to indicate the locations of the studs.
4. Repeat the process for each board and on each wall around the tub. Use your jig saw to cut out holes for the bath fixture on the wall, as needed. Cover the whole wall.
5. Lay mesh drywall tape on the seams where the cement boards meet each other. Spread mortar over the mesh tape, using your 6-inch drywall knife. Get the mortar smooth and flat.
6. Let the mortar dry overnight. Lightly sand it with a drywall sander to ensure there are no high spots. The wall is ready for tiling.
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