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A Step-By-Step Guide to Repairing Cracked Plaster Walls

wall crack

Cracked plaster walls can be an eyesore and a sign of structural problems in your home. Fortunately, repairing them is a relatively straightforward process that most homeowners can do with just a few tools and materials. 

Below is a step-by-step guide on how to repair cracked plaster walls.

Step 1: Assess the Damage

Before you start repairing the plaster walls, it’s essential to assess the damage. You need to know the extent of the damage, and whether it’s a small crack or a large hole. If the crack is less than 1/8 inch wide, it’s considered a hairline crack and can be repaired using simple methods. On the other hand, if the crack is wider than 1/8 inch, it requires more extensive repairs.

Step 2: Gather the Necessary Tools and Materials

Once you have assessed the damage, you need to gather the necessary tools and materials. The tools required for repairing plaster walls include a putty knife, sandpaper, a paintbrush, and a plastering trowel. The materials required include plaster, joint compound, drywall tape, and paint.

Step 3: Prepare the Surface

Before repairing the plaster, you need to prepare the surface. Start by removing any loose plaster around the crack. Use sandpaper to smooth out the edges of the crack and remove any debris. Next, clean the area around the crack using a damp cloth. This will ensure that the repair materials adhere to the surface.

Step 4: Apply the Plaster

Once the surface is prepared, it’s time to apply the plaster. Apply a thin layer of plaster over the crack, using a putty knife. Smooth out the plaster using a plastering trowel. If the crack is wider than 1/8 inch, you’ll need to use drywall tape to strengthen the repair. Apply a layer of joint compound over the drywall tape, and smooth it out using a putty knife.

Step 5: Let the Plaster Dry

Allow the plaster to dry completely. The drying time will depend on the thickness of the plaster, but it’s usually around 24-48 hours. Avoid touching or disturbing the repair during this time.

Step 6: Sand the Surface

Once the plaster is dry, use sandpaper to smooth out the surface. Sand the surface until it’s even and smooth. This will ensure that the repaired area blends in with the rest of the wall.

Step 7: Prime the Surface

Before painting, it’s essential to prime the surface. Priming will help the paint adhere to the wall and prevent any future cracking. Use a paintbrush to apply primer to the repaired area. Wait for the primer to dry completely before painting.

Step 8: Paint the Wall

Once the primer is dry, it’s time to paint the wall. Use a paintbrush or roller to apply paint to the repaired area. Make sure to match the paint colour with the rest of the wall to ensure a seamless finish.


Repairing cracked plaster walls is a relatively simple process that most homeowners can do. It’s essential to assess the damage, gather the necessary tools and materials, and prepare the surface before applying the plaster. Repairing cracked plaster walls is an important maintenance task that can prevent further damage to your home’s structure and enhance its aesthetic appeal.

If you live in Brisbane and need professional help repairing your plaster walls, We Plaster & Recruit has you covered. We are plasterers in Brisbane with years of experience and expertise in plastering services, and we can help you with all your plastering needs. Get in touch with us today to repair those cracks in a snap!

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