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How To Fix Drywall Cracks In Corners

How to repair drywall cracks in the corners

How To Fix Drywall Cracks In Corners

Drywall is a typical building material that is used in the construction of walls and ceilings in many homes and structures. Unfortunately, it is prone to cracking, especially in corners where two drywalls meet. These cracks may not be attractive and can make you think twice about the dignity of a wall or ceiling. However, repairing drywall cracks in the corners is a simple cycle that should be possible with just a few devices and materials.
In this article, we will consider the tools associated with the repair of drywall cracks in the corners. We’ll explain the tools and materials you’ll need, as well as the procedures you’ll use to repair fractures.

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Tools & Materials

Drywall saw
Sabre saw
Electronic Stud Detector
Metal scissors
Corner moldings for drywall
Fiberglass drywall tape
Wooden bolts
Drywall screws and/or nails

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Surface Crack

Unlike plaster, drywall has a seamless paper coating that rarely cracks or cracks. When a crack occurs, it is usually located in the seam where two sheets of drywall meet, and is easy to repair.

If the gap is in a vertical or horizontal seam, slightly widen the gap with the angle of a paint scraper, utility knife or chisel to see if the crack goes completely through the paper covering the seam (Fig. 1). And when the tape comes off the wall surface. If the tape is intact and well glued, the crack is likely caused by the drying and shrinkage of the old drywall seam. Just fill the crack with a new link. When applying the mass, hold the knife at an angle of 70 degrees and hit the crack. Make sure the knife is clean by scraping both sides along the edge of the pan. Let the grout dry completely and then lightly rub the area (Fig. 2). Wipe off the powder and paint on it.

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Deep fault repair

If the tear passes through the paper sewing tape or if the tape has come off the wall, use a razor to cut the tape about 6-12 inches from both ends of the damage (photos 1 and 2). Remove the tape, but be careful not to tear the lid off the drywall. Scrape off the loose mass and use a razor or drywall saw to widen the crack through the wall surface into the bolt cavity (Fig. 3). Avoid removing tight, well-welded joints outside the crack itself.

Fill the crack with a new drywall compound and apply a thin layer of the mixture to the surface of the wall where the old tape was removed. While the joint is still wet, place a strip of fiberglass tape over the seam, which closes the gap between the edges of the existing tape (Fig. 4). Gently smooth out wrinkles with a spatula and place the foil on top of the composition.

After the mixture has dried, apply a second thin layer of the mixture to the sealed area. Cover with tape and allow the edges of the new joint to narrow or “open” towards the surface of the surrounding wall (Fig. 5). The drywall composition should be applied in several thin layers, since thicker layers are very difficult to smooth out and eventually lead to cracking.

When the second layer is well dry, rub lightly to smooth out dents. Then use a wide (8 to 12 inches) grout knife to completely cover the pavement with the third and final layer. Try to mix this layer with the wall surface as seamlessly as possible. After drying, rub slightly, wipe off the powder and repaint the entire area.

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Why are there cracks in the corners of the walls?

Natural subsidence of the building, impact damage, water damage or general wear and tear can cause cracks in the corners of the walls. You can take appropriate measures to repair and prevent future damage if you understand the cause of the cracks. Before proceeding to the repair, let’s discuss the most common causes of damage to drywall corners.

Impact damage

Accidents happen, and sometimes the corners of drywall can be affected. Moving furniture, rough body or even an improper elbow can lead to dents, cracks and holes in drywall.

Water damage

Leaks from plumbing or the ceiling can damage water in drywall. If left unchecked, water damage can cause mold growth, weaken drywall and lead to big problems.

To wear

Drywall can wear out over time, especially in high traffic areas. The corners are especially susceptible to crumbling, cracking or peeling of paint.

Frequently Asked Questions (FAQs)

How can you tell whether a drywall crack is severe?

While most drywall cracks are cosmetic in nature and can be easily repaired, some cracks may indicate a more serious problem, such as structural damage or water leakage. If the cracks are accompanied by other signs of damage, such as swollen walls, mold or mildew odor, it is important to consult a professional to assess the situation.

Is it possible to repair a damaged drywall corner without replacing the corner roll?

Yes, you can repair minor damage to the drywall corner by applying the joint directly to the damaged area without replacing the corner roll. However, if the corner board itself is damaged or the damage is serious, it is better to replace it.

What type of board should I use for repairs?

Both metal and plastic corner moldings are suitable for drywall repair. Metal corner molds are more durable and can provide better protection against future damage, while plastic corner molds are easier to work with and less susceptible to rust.

How long do I have to wait between grouting and grinding?

The drying time of joint joints may vary depending on the manufacturer’s specifications, humidity and temperature. In general, it is best to wait at least 24 hours before rubbing to ensure that the mass is completely dry.


With the appropriate equipment and supplies, repairing damaged drywall corners is a simple task that you can complete. You may get your drywall corners back to how they were by following the instructions in this article and avoiding more damage. You may get a result that looks professional by being a little patient and paying attention to the details. For both experts and do-it-yourselfers, Timothy’s Toolbox has a comprehensive selection of drywall equipment that will make it simple for you to finish your drywall repair chores. Visit our collection right now!

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