How to Repair Wall Cracks Repairing a Plaster Wall Crack
Step 1Press gently on the wall near the crack to see if it gives. If it’s easy to press down or if the wall flexes at all, the plaster has likely come apart from the lath.This requires reattaching the two together and cannot be fixed by a simple patch job. Contact a professional for help.
Step 2
Widen the crack using a putty knife if it’s less than 1/4 inch (6.4 mm) wide. It sounds counterproductive but scoring (lightly scratching) the crack creates a wider surface for the joint compound to more easily adhere to.
Step 3
Spread a coat of joint compound over the crack. Do so with a 4 in (10 cm) taping knife. Use a setting-type compound instead of drywall compound as it is stronger and can affix to plaster more securely.Apply in thin layers.
Dampening the crack before applying the compound will remove any loose particles and help the compound hold better.
Step 4
Press fiberglass mesh tape firmly into the wet compound over the crack. Cut the strips to size with scissors. This self-adhesive tape will prevent the crack from growing.Let dry.
For the setting-type compound to dry thoroughly, your room should be between 55 and 70 °F (13 and 21 °C).
Step 5
Apply 3 layers of compound over the taped area. Let each coat dry completely in between. With each additional layer, extend the compound another 2 to 3 inches (5.1 to 7.6 cm) outside the previous layer’s edges. Your last layer should extend 12 inches (30 cm) beyond the original area.Lightly sand each layer with a fine sandpaper to remove bumps in between coats.
Use a feathering technique when applying the compound. With the knife at a 70-degree angle, start at the center and pull the knife to the outside edges of each coat, increasing pressure the further away from the middle you get.
Step 6
Paint over the patched area to match the rest of the wall. If you can see a raised section where you did your repair, sand it flush to the wall before painting so it blends seamlessly.
It’s smart to wait at least 24 hours prior to painting to ensure the compound is completely dry.
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