Drywall Cracks in Corners of Walls and What to Do

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Corners of drywall are slightly more difficult to handle than flat layer, and less experienced workers may not be able to spread enough mud or scrape the tape sufficiently. As a result, the tape is bubbling and separating. This problem is not difficult to solve, but other problems can arise due to cracks appear in the corners. Drywall cracks in corners of walls often indicate that the wall is swaying and will eventually reappear when you covered them with mud. Even if you can’t harden the wall, you can strengthen the corners of the drywall so that they don’t crack quickly.

The Causes of Cracks in Drywall

The Causes of Cracks in Drywall

Most of the cracks in the drywall are found at the intersection of two drywalls. Because tape and drywall mud are used, the seams are usually not visible. The seams are filled with mud and covered with tape. The pressure on the seams causes them to crack. These cracks typically appear around high pressure areas such as door frames, windows, and corners.

This pressure can come from a variety of sources. Changes in temperature can cause the drywall to expand in contraction, resulting in stress that cracks the seams. The building always sags, they can put pressure on the walls and damage the plaster. If the building is built on fill-dirt, the sagging may be worse. This softer base material at the foundation causes more sagging and more movement.

Installation can be improved to prevent cracking of drywall. It is best to use a better mixture of mud or tape. However, no action can be taken for some cracks. The seams are just too strong that some pressure will be simply too much for the seam to bear without cracking.

Another problem that can arise with in the drywall is the popping of nails. The nails holding the drywall to the studs began to come out. This will cause the surface of the drywall to dimpling. Fortunately, this annoying problem is easy to prevent or fix.

How To Prevent Drywall Cracks

How To Prevent Drywall Cracks

Proper installation is the best way to avoid cracks in the walls. If you want the seams to be as strong as possible, then there are no shortcuts. To keep the seams strong and prevent cracking, you should use the proper drywall mud and tape.

There are various types of drywall mud. Some drywall mud are more sticky than the others. Sticky mud works best for the first layer. Lower-quality mud can be used for the second and third layers. For the first layer, find fast-setting “hot” mud or general-purpose drywall materials. Then use a light mud on the top layer. The strongest crack-resistant layer is made with the right amount of mud.

It is also important to use the correct tape. The drywall layer is traditionally covered with a paper tape. You can also use fiberglass mesh tape. In general, paper tape is believed to be stronger and more resistant to prevent cracking. Unless you want to use “hot” fast-setting drywall mud, avoid using mesh tape.

By choosing a high quality wood for your nails, you can avoid serious damage. Dirty bumps on the nails might be the cause, it can be prevented by using high-quality wood. Also, nails can be installed before hanging the dry wall to prevent them from falling off. The more nails you use, the less pressure you can get and prevent the nails from falling into the bud.

If Necessary, Do a Quick Structural Inspection of The House

How to Repair Drywall Inside Corners

The first step is to get out of the house and walk; check:

  • Cracks in the foundation or whether it is bent or curved or sloping.
  • Cracks in the facade or plaster (some small cracks usually occur).
  • Is the roof is sagging or bent?
  • If you have a basement, check to see if the wall is cracked or bent.

Walk in the interior:

  • Is the floor level or sloping?
  • Is the door stick to the floor?
  • Are there any doors or windows that stick?
  • Look for loosed ceilings and curved walls.

Depending on the situation and its degree, the above factors may indicate a structural problem. If so, you may need to address some of these issues to prevent cracking from reappearing.

Who Can Repair Cracks in Drywall?

Drywall Cracks in Corners of Walls

DIY enthusiast, homeowner, handyman, drywall taper or painter can repair cracks in drywall. For most cracks, a painter would be the right person to seal and cover the cracks. In some cases, you may need a trained drywall contractor or maintenance personnel who can tape and mud joints. There are wide range of products that you can use, such as mesh tape, mesh patch kits, drywall mud, and caulking compounds. Depending on the texture of the walls, homeowners may find it difficult to adapt to existing texture pattern. In this case, it is better to cooperate with an experienced drywall contractor. However, most of the small cracks can be filled and repainted so that they are not easily visible. Applying a little drywall mud or spackle is not very effective, and even natural expansion and contraction due to temperature changes can cause further cracks.

How to Repair Drywall Inside Corners

Fixing Bubbling and Separating Tape

Use a knife to cut the bubbles and separate the tape. Cut off all the loose tape, leaving only the tape that is still firmly attached to the wall.

Use a 4-inch drywall cutter to scrape loose, dry mud or joint compound. It is important to remove everything, when repainting, even small particles can cause scratches.

Apply a new layer of mud on each damaged area. General purpose premixed mud works well, but you can also make your own mud by mixing powdered joint compound in a bucket of water. The mixed mud must be as thick as peanut butter.

Use paper drywall tape over every repair. Soak the tape in water before laying it, it will stick and flatten. Wipe the tape evenly and immediately cover it with mud again. Scrape off the mud flat and let the recovery dry overnight.

Reapply once or twice, using a wider knife to scrape each coat and gradually smooth the seams. Before applying the next coat, allow each coat to dry and then sand the last coat with 120-grit sandpaper. Before painting, use drywall primer to prime.

Fixing Cracks

Slide the paint scraper under the torn tape, lift it up, and then remove the tape. Scrape all the mud off the two walls that make up the corner so you can put on the new tape.

Use a 4-inch drywall knife to spread the hot mud on the two walls that form the corners. Cut enough fiberglass drywall mesh tape to cover the seam, fold lengthwise, and lay over the mud. Apply another coat of mud to the top of the tape and then scrape it flat.

Allow the hot mud to dry completely, which takes 6-10 hours, and then re-coat with two to three coats of non-setting mud. Scrape and dry each coat before applying the next. Before painting, the final coating is must be sanded and primed.

Tools and Materials

  • Utility knife
  • 4-, 6- and 8-inch drywall knives
  • Paint scraper
  • Mudding tray
  • Paper drywall tape
  • Fiberglass mesh tape
  • Hot mud
  • Non-setting mud
  • 120-grit sandpaper
  • Drywall primer

Repairing Tips

Hot mud is difficult to sand, so it is important to smooth it out before it hardens.

Both the fiberglass mesh tape and hot mud are crack resistant, so the joint should provide a permanent fix unless the wall shift is extreme.


Determine how long the hot mud will settle by reading the instructions on the bag and mixing only what you can use at that time. Do not overdo it if it starts to harden, and make sure to clean the knife and the appliances on the tray before it hardens.

How to Repair Drywall Cornerbead

How to Repair Drywall Cornerbead

Fixing Hairline Cracks and Loose Cornerbead

This common damage can occur in a 90 degree metal cornerbead as well as a bullnose cornerbead. Scrape off any loose plaster from the metal corners. Use a sharp trowel or utility knife to remove any loose plaster mix. With the sharp tip of the knife, slide the knife up and down moving towards the edges of the corners.

After completely removing a small portion, move the flat edge of the knife to push out any remaining loose compound. Make sure the drywall cornerbead are fully set. To check for loose areas, press the edge. If there is any movement, drywall nails should be installed at the edges. If you apply too much force to drive the nail into the corner, the metal edge will distort. An electric stapler can be used instead of nails.

Now that you have the area ready, proceed to completion. Fiberglass tape is the best option for this type of repair. The best drywall compound most suitable for repairing drywall cornerbead is a setting type compound, which should be provided in the form of a powder.

Place the self adhesive fiberglass tape in the center over the edge of the cornerbead and put it on the wall. Apply a thick coat of drywall compound to embed the tape. The additional compound coating should be thinner and wider to smooth the edges. Finally, sand lightly with a medium-fine sanding block. Then apply a texture that matches your existing final result.

Fixing Dented or Damaged Metal Cornerbead and Bullnose Cornerbead

If the drywall cornerbead are dented or badly damaged, they may need to be replaced. No need to replace all the dents, all you need is a little imagination and a quick-setting drywall compound.

Small dent in the bullnose cornerbead.

Spread the setting type compound in two layers. Use a 3 or 6 inch drywall knife and pull the compound through the dent, around the corner. Spread the sand around the corners in a circle. The idea is to reshape the corners. Don’t move up or down. This creates a flat point. Apply a primer after sanding. You can use aerosol primer. If necessary, apply additional compound and reapply primer before painting.

Replace damaged area of of drywall cornerbead.

Section replacement is the only option in the event of severe damage. It can be cut with a hacksaw and then removed. The replacement piece must be fit exactly. Otherwise, you will see the difference. Another option is to replace the entire piece of cornerbead. This is a great option for real improvements. Both options require not only loosening and removing, but also cutting the tape used during installation. The reinstalled cornerbead needs to be nailed and glued for permanent renovation.

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