Installing a bathroom ceiling is the exact same process as installing a drywall ceiling anywhere else in the house, except you don't use regular drywall. Wetrock is a form of drywall that is manufactured with an oil mixed into the gypsum that makes it moisture-resistant, so it's ideal for high-moisture areas like the bathroom. Wetrock is significantly heavier than drywall, so recruit an assistant to help you install the bathroom ceiling.
Instructions
1. Measure the ceiling in a perpendicular direction to the ceiling joists, from one end out to the last joist that's within 8 feet. Take the measurement from the starting wall to the middle of the width of the joist.
2. Transfer the measurement to a piece of wetrock. Stand the piece on its long edge with a T square at the mark. Run a utility knife along the T square, scoring the piece. Snap it at the line, then cut away the paper on the back to separate it.
3. Lift the cut piece to the ceiling with your assistant, standing on the scaffold set between two ladders. Set the cut end against the starting wall and the factory edge on the middle of the width of the joist.
4. Secure the board by shooting galvanized drywall screws every 6 to 8 inch along each of the joists that are behind it.
5. Hang the rest of the wetrock over the whole ceiling in staggered courses, starting off the end of the first one. All cuts should face the walls, not adjacent pieces of wetrock. The sheets are sized to fit correctly on standard joists. Make sure there are no four-way intersections between the sheets. Use a jigsaw to cut out any necessary holes for ceiling fixture or vents.
6. Lay adhesive mesh tape along each of the lines between the wetrock sheets. Cover the tape with joint compound, using your drywall knife. Cover all the screw holes as well. Get the compound flat and smooth. Let it set for 8 hours.
7. Apply a second, thinner coat of joint compound over the taped lines and screw holes. Let it set and repeat a third time. Sand the compound flat and smooth. Paint the ceiling.
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