Replace damaged drywall with a new section.
Drywall panels, composed of pressed gypsum particles and covered with paper, form a smooth surface for walls and ceilings. Unfortunately, when exposed to water or frequent dampness, drywall can rot, discolor and even crumble. Fixing damaged drywall includes removing the rotted section and replacing it with new drywall. You'll need some basic drywall tools and the ability to measure accurately.
Instructions
Replace Rotted Section
1. Locate the studs beneath the drywall on both sides of the rotted section. You may do this by tapping on the drywall and listening for a "solid" sound, or by using an electronic stud locator.
2. Replace the damaged section with new drywall.
Measure a rectangle around the rotted section, starting at the stud closest to one side and ending at the stud on the other side. Allow about 2- or 3-inches above and below the rotted section.
3. Cut a new piece of drywall to the measurements and then hold the new piece over the rotted area, using it as a template and tracing the shape of the new section onto the wall.
4. Cut along the lines with the utility knife and pry the old drywall away from the wall.
5. Fit the new drywall section into the hole you just cut. It should fit easily, since you used it as a template to cut out the old drywall. The sides should extend over the studs.
6. Install drywall screws through the new drywall and into the studs beneath. Insert a screw every 8 inches.
Tape and Finish
7. Cut four pieces of drywall mesh tape to fit the seams all the way around the new section, but do not overlap the tape.
8. Scoop out about ½ cup of premixed joint compound and apply it to the seam, pressing and smoothing the compound through the mesh with a 6-inch taping knife. Repeat until the entire seam is filled with compound and smoothed flush with the wall.
9. Switch to a 10-inch taping knife while the compound is still wet and smooth it further, using long strokes with the wide end of the knife while exerting gentle pressure.
10. Allow the joint compound to dry before sanding away rough spots with a drywall sander and apply an additional coat of drywall compound, using only the 10-inch taping knife.
11. Repeat the process a third time and let dry completely before sanding smooth with the drywall sander and painting or wallpapering to match your existing wall.
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