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How to Fix Cracks in Plaster Walls

How to Fix Cracks in Plaster Walls

How to Fix Cracks in Plaster Walls

A crack in a plastered wall can be intimidating and even cause concern. While the sudden appearance of a crack in a previously intact wall should always be taken with a grain of salt, they are relatively easy to repair on their own.(Plaster Walls)

Whether they occur after the installation of the foundation, sudden changes in temperature, or even just a bump or dent when moving heavy objects, there are many reasons that can cause cracks in the walls.

See how professional decorators repair cracks in plaster walls with instructions so simple that even the DIY amateur can handle them.

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How to seal cracks in wall plaster

Like plaster ceiling repairs, this DIY project requires only six tools, and you can do it yourself with a little time and patience, says Don Reed, a home builder at RealCraft. Learning this skill is also important if you want to maintain the integrity of your walls, she adds.

Steps Recommended by Experts

You run the danger of making the damage worse if you let the fractures spread, particularly if water or moisture seeps in. This can worsen the issue by causing mold damage, and cracks can also spread to other places.

Connect the crack

Use a utility knife or a painter’s 5-in-1 tool to cut around the edges of the cracks, easily open the crack, and remove loose material. While opening the tear may seem counterintuitive, you’ll need to enlarge the area to glue the seam joint. Do not forcibly scratch at the crack. Be careful and drive slowly. Use a store-bought vacuum cleaner to remove all crumbs and dust from the crack.


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Cut Drywall Paper Tape

Measure and cut one or more lengths of drywall tape to match the tear. Drywall begins to dry quickly, so cutting off the tape prematurely will speed up this work and prevent accidental folding, folding, or bumping. Use scissors or a utility knife to cut the tape, as tearing off the tape by hand will result in a shredded edge.

Pull on the connection of the seams

If necessary, mix the drywall joint. Pick up a small area with a 6-inch drywall knife and run a thin layer of seam over the crack to create a path slightly wider than paper tape. Immediately proceed to the next stage, as the joint dries quickly.

Apply tape to the crack

Manually place the tape on top of the dirt, then use a 6-inch knife to smooth it out in one or two passes. The goal is to straighten the belt and ensure full contact with the joint, without creases or air pockets. Be careful not to overexert yourself and tear the tape. Allow the joint to dry completely.


Hairy or arachnoid cracks: These small cracks are often thinner than a nail and often only harm the look of your room. You can fix them if you want to prevent them from spreading or leave them alone.

Straight cracks: These cracks, which move horizontally, vertically, or diagonally, are often caused by foundation subsidence and plaster moving with the walls of your home, says Don Reed, a building contractor.

If all of the cracks appear to be in the same spot and facing the same way, your home may have settled. Despite the fact that it’s not a major deal, you should employ someone right away to come to your institution and make sure everything is going as planned.

Convex cracks: A convex crack does not protrude from the wall, as the name suggests, but it is a large crack with smaller cracks leading away from it. This is often caused by a process called delamination, in which the outer layer of plaster is separated from the inner layer of plaster. If you have these, you may need to remove and replace the outer layer of plaster.

Cracks: If you have a crack in a plaster wall accompanied by paint or wallpaper bubbles, then you may have a leaking pipe in the wall that needs to be repaired urgently. In this case, it is better to call a professional plumber to fix the cause of the problem before fixing the crack.


Cracked walls can be a big problem for homeowners, but with these tips, you can prevent them from appearing in the first place. Remember to use high-quality materials, pay attention to proper installation, maintain a constant temperature and humidity, solve foundation problems and do not hang heavy objects on the walls. By following these tips, you’ll be able to keep your walls looking good for years to come.

Frequently Asked Questions

What is the best aggregate for cracks in plaster?

Filling cracks in ceilings and walls is important to keep your home great and prevent future problems.

But which plaster crack filler works the best?

To choose the best option for you, you need to do a little research. For example, you’ll need a long-lasting putty that can be sanded for excellent results. Also, any filling you choose should be fine and the same color as your ceiling or walls.

How do you seal deep cracks in British plaster walls?

When it comes to deep cracks, it’s hard not to worry about further consequences for the structural integrity of your home. The truth is that these cracks can be repaired on their own, but if they come back or become particularly deep, you may need to hire a specialist to treat them.

Are you wondering how to fix large cracks in plaster walls in the UK?

Use the advice below: To gently remove any debris or lumps of plaster from the deep fracture, use a chisel or knife. Before applying plaster of Paris, fill with newspaper to give the crack additional rigidity. Cover the fissure with a layer of plaster after covering it with newspaper. After the plaster has dried, apply another coat and continue until the crack and the wall or ceiling are level.

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