Repairing drywall cracks is a relatively simple DIY task. Here's a step-by-step guide to fix small and large cracks in drywall:
Materials You'll Need:
Joint compound (also called drywall mud)
Drywall tape (paper or fiberglass mesh)
Utility knife or drywall saw
Putty knife (various sizes)
Sandpaper or sanding block (fine-grit)
Primer
Paint
Painter's tape (optional)
Steps to Repair Drywall Cracks:
1. Assess the Crack
Small cracks (hairline cracks or cracks less than 1/4 inch wide) can usually be fixed without reinforcing the area with tape.
Large cracks (greater than 1/4 inch or cracks that appear in seams or corners) may require drywall tape to help strengthen the repair.
2. Prepare the Area
Use a utility knife or drywall saw to widen the crack slightly to create a V-shaped groove. This helps the joint compound adhere better to the surface.
Remove any loose drywall or debris around the crack to ensure a smooth, clean surface.
3. Apply Joint Compound (Drywall Mud)
For small cracks: Use a putty knife to apply a thin layer of joint compound over the crack. Spread the compound evenly across the area, feathering the edges so it blends with the surrounding wall.
For larger cracks: Apply a layer of joint compound over the crack, and then press drywall tape (either paper or fiberglass mesh) into the compound while it's still wet. Smooth the tape into place with the putty knife.
4. Smooth and Feather the Compound
After the first layer of joint compound has been applied, use your putty knife to smooth out the compound and remove any excess. For a smooth finish, feather the edges so that the compound blends seamlessly into the rest of the wall.
Allow the joint compound to dry completely. Drying time may vary depending on the thickness of the compound and the room’s humidity (usually 24 hours).
5. Sand the Area
Once the compound has dried, lightly sand the area using fine-grit sandpaper (220-grit or finer) until the surface is smooth and level with the surrounding drywall. Be careful not to sand too aggressively, which can damage the wall.
Wipe away the dust with a damp cloth or sponge.
6. Apply Additional Layers of Joint Compound
For deeper cracks or a more seamless finish, you may need to apply two or more layers of joint compound.
Each time you apply a new layer, let it dry fully, then sand it smooth before applying the next coat.
7. Prime the Area
Once the final layer of joint compound is smooth and dry, apply a coat of primer to the patched area. Primer helps seal the joint compound and ensures that the paint adheres properly.
Let the primer dry completely.
8. Paint the Patch
Once the primer is dry, you can paint the patched area to match the surrounding wall color. You may need to apply two coats of paint to achieve a seamless finish.
Additional Tips:
If the crack is located in a corner or along a seam, it’s often a good idea to use corner bead or tape for added strength, as these areas are more likely to crack again over time.
For ceiling cracks, you may need to use specialized ceiling joint compound (which is thicker) to avoid sagging or dripping.
If you notice recurring cracks or the cracks continue to reappear after repair, it could indicate underlying issues like settling foundation or moisture problems that need to be addressed before further repairs are made.
