Water-resistant drywall is used in bathrooms
Drywall installers use a special water-resistant drywall in bathrooms. A common brand is manufactured by United States Gypsum (USG) and is colored green to distinguish it from ordinary drywall. Since the USG brand of drywall is called sheetrock, the green variety is commonly known as greenrock. It is finished with drywall tape and joint compound in the same way as regular drywall, and is repaired the same way. Because of moisture in the bathroom, cover repairs with water-resistant paint as soon as you have made them.
Instructions
1. Patch small holes and cracks with mud. Spread it on with a drywall blade, then scrape off the excess and let it dry overnight. Re-coat to completely hide the repair, let the mud dry, then sand it lightly before repainting.
2. Fill larger holes with patching compound, and then cover them with drywall tape before re-mudding. Mix patching compound with water until it is the consistency of peanut butter, then spread it in the hole and wait 30 minutes for it to set. Cover the hole with fiberglass mesh tape, spread mud over the tape and scrape the excess away with the blade. Top-coat the repair with two more coats of mud.
3. Cut out a rectangular section around damaged drywall with a drywall knife. Cut back to the studs on either side of the repair and use a utility knife to trim the edges so that 1/2 of the faces of the studs are exposed on either side.
4. Cut out a new piece of greenrock to fit in the hole and screw it to the exposed studs with drywall screws and a drill. Spread mud around the edges of the new section and lay moist paper drywall tape on top of the mud. Scrape along the surface of the tape to flatten it and remove excess mud. Let the mud dry overnight.
5. Top-coat the taped seams with two coats of mud, letting the first dry overnight before applying the second. Scrape each coat flat with the blade, feathering the edges of the mud into the wall to hide the seams.
6. Repair bubbling or separating drywall tape by cutting out the damaged tape with a utility knife. Spread mud over the cut out area, and lay new tape on top. Top-coat and finish with two more coats of mud.
7. Sand all repairs lightly with 120-grit sandpaper after the last coat of mud has dried, then paint all exposed mud with wall primer and a paintbrush.
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