How to Fix a Crack in Drywall

Small cracks can be fixed with mesh tape and joint compound, while larger cracks may need fiberglass tape or even cutting out and replacing the damaged section.

1. Assess before you repair. Remove any loose drywall pieces around the crack using a putty knife. Wipe the area clean with a damp cloth. If the crack is wider than 1/8 inch or keeps reopening, you likely have structural movement that needs addressing before cosmetic repair.
2. Seal the fracture line. For cracks under 1/8 inch, press self-adhesive mesh tape directly over the crack, extending about 2 inches beyond each end. The tape should lie flat without bubbles or wrinkles.
3. Strengthen wider gaps. For cracks 1/8 to 1/4 inch wide, apply a thin layer of joint compound first, then embed fiberglass tape into the wet compound. This creates a stronger repair than mesh tape alone.
4. Build the first layer. Using a 6-inch putty knife, spread joint compound over the tape in smooth, even strokes. The compound should extend about 6 inches beyond the tape on each side. Feather the edges so they blend into the surrounding wall.
5. Smooth the surface. Allow 24 hours for complete drying. Lightly sand any ridges or imperfections with 120-grit sandpaper. The goal is smoothness, not removing all the compound.
6. Blend into the wall. Using an 8-inch knife, apply a second coat of joint compound, extending it wider than the first coat. This coat should be thinner and smoother than the first. Feather the edges carefully.
7. Prime and perfect. After another 24 hours, sand lightly with 150-grit paper until the repair blends seamlessly with the wall. Prime the repaired area before painting to ensure even color and texture.