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Plastering Central Coast

Feb 12

How to repair cracked plaster in 4 steps

Older homes often have lath and plaster walls. Plaster is a durable and good-looking surface, but there is one drawback: Plaster inevitably develops cracks.

Small plaster cracks have the unpleasant property of constantly reappearing. Therefore, it may be wiser to enlarge them and repair them properly once and for all.

Making a minor fault bigger may seem counterintuitive, but massive cracks in plaster are easier to fix than small ones. Use plaster that doesn't shrink as it dries, or buy a premixed plaster repair compound.


What you need:

Here are the tools you'll need to repair cracked plaster:

  • Utility knife
  • vacuum cleaner
  • Gypsum plaster or premixed gypsum repair compound
  • paintbrush
  • spatula or trowel
  • wooden block
  • Medium or fine-grit sandpaper
  • Primer and paint

1. Prepare the crack

Cut away the loose plaster with a box cutter. Rotate the knife to widen the opening and make it cleaner. Remove debris without compromising the structural integrity of the surrounding surface. Remove loose plaster and dust with a vacuum cleaner.


2. Mix and apply the plaster

Mix a thick plaster paste and water and wet the crack thoroughly with a brush dipped in water. Pack the plaster (or repair compound) into the wet crack to its full depth and smooth the surface with a trowel or spatula. Allow the filled crack to dry for at least 24 hours.


3. Sand and let dry

After the plaster has dried, lightly sand the area with medium or fine grit sandpaper wrapped around a wooden block. If the crack was wide, plaster it at least one more time to smooth the surface, re-wetting the plastered area each time. After the final plastering, let the area dry for at least 24 hours.


4. Sand, prime and paint

Lightly sand the area again and prime it with a thinned coat of paint or primer. After the primer has dried, paint the entire wall.


What is the difference between drywall and plaster?

Drywall is made of a softer material called gypsum that does not crack. When finishing the interior of a house, sheets of this material are nailed into the wood studs. On the other hand, plaster dries much harder than drywall and is more labour intensive and expensive.


What is the cost of hiring a plasterer?

The plastering cost depends on the size of the wall area to be plastered and the type of plastering, whether it is different types of plasterboard, partitions, wet plaster, decorative plaster or plaster repairs. Removing old plaster or adding special finishes can also drive up costs. 

Most plasterers will provide an estimate based on the square feet of wall area to be plastered. The estimate will depend on how many materials are needed, the cost of labour and how long the work will take overall.


Are you interested in wall plastering for your house?

A house reflects the kind of people who live in it. So beautifying the exterior walls of your home is certainly ideal for all homeowners. 

At Plastering Central, we offer plastering services for your home, whether it's a renovation or new construction. As an experienced painting company, we can deliver high-quality projects that meet your design expectations. So talk to us now and see how we can transform your home.

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