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Repairing Drywall Cracks In Corners



Cut it to size and screw it into place, spacing the screws every 6 in. Taping the edges of the patch drywall to make it invisible is the trickiest part of the how to fix drywall job. Buy a gallon tub of drywall compound and a roll of paper tape.

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  1. Drywall finishing—or taping and mudding—is by far the most challenging part of drywall installation, and it's where amateur drywallers run into the most problems.But while the skill of perfect finishing comes only through practice, there are several common mistakes amateurs make that are easily corrected with a better technique or material, or both.
  2. A lot of cracks in drywall happen at corners of openings such as window and doors. These can result from the building settling but they are usually caused by shifting framing members which may be missing fasteners or don’t have enough fasteners.
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17

Buy a fresh tube of paintable silicone caulking.

Adobe master collection 5.5 key. Caulking is useless once it becomes dry.

27

Apply a thin bead of caulk into the crack.

Be sure to get the caulk actually inside the crack.

37

Smooth out the caulk bead.

You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.

Repairing Drywall Cracks In Corners Of Wood

47

Smooth out the caulk bead.

You can use a wet finger if the crack is small enough. If not, use a 5-in-1 tool or a putty knife.

57

Clean away excess caulk.

Wipe the excess caulk away from the outside of the crack. Rubbing alcohol works great.

67

Paint over the patch with primer.

Don’t skip this step or you’ll end up with a permanently goofy-looking, non-matching area.

77

Apply touch up paint to the patch in your wall color.

This is why you saved that half a gallon of leftover wall paint.

Written by Chris Deziel; Updated December 10, 2018

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  • 1 Fix a Bad Seam in a Wall
  • 2 Repair a Painted Drywall Seam
  • 3 Make Perfect Corners for Sheetrock Walls
  • 4 Appply Joint Compound After Drywall Hanging

Inside drywall corners are a bit more difficult to finish than flat seams, and an inexperienced worker may fail to spread enough mud or to sufficiently scrape the tape. The result is tape that bubbles and separates. This problem isn't very difficult to fix, but you may have more trouble if cracks appear in the corners. Corner cracks often signify that the walls are shifting and will eventually reappear if you simply coat them with mud. Even if you can't stabilize the walls, you can fortify the drywall corners so they don't crack as easily.

Bubbling and Separating Tape

  1. Cut out bubbles and separating tape with a utility knife. Cut away all the loose tape, leaving only tape that is still firmly attached to the wall.

  2. Scrape off dry, loose joint compound, or mud, with a 4-inch drywall knife. It's important to remove all of it -- even small particles can cause streaking when you recoat.

  3. Spread a new coat of mud over each damaged area. All-purpose, pre-mixed mud works well, but you can also make your own by mixing powdered joint compound with water in a bucket. The mud should be as thick as peanut butter.

  4. Lay paper drywall tape over each repair. Dip the tape in water before you apply it to make it adhere and flatten better. Scrape the tape flat and recoat it immediately with mud. Scrape that mud flat and let the repair dry overnight.

  5. Recoat once or twice more, using a wider knife to scrape each coat and progressively flatten the seam. Let each coat dry before applying the next, and sand the final coat with 120-grit sandpaper. Prime the repair with drywall primer before you paint it.

Cracks

  1. Slide a paint scraper under a section of cracked tape and lift it, then pull off the tape. Scrape off all the mud from both walls forming the corner so you can lay new tape.

  2. Prepare a small amount of setting-type, or hot, mud. Pour some powder into a mudding tray, add water and stir until it is lump-free and about the consistency of honey. You can mix it thinner than the non-setting variety because it doesn't shrink and is best applied in thin coats.

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  3. Spread the hot mud on both walls that form the corner with a 4-inch drywall knife. Cut enough fiberglass mesh drywall tape to cover the seam, crease it lengthwise and lay it on top of the mud. Spread another coat of mud on top of the tape and scrape it flat.

  4. Let the hot mud dry completely, which takes from 6 to 10 hours, then recoat it with two or three coats of non-setting mud, scraping each coat flat and letting it dry before applying the next. Sand and prime the final coat before you paint it.

  5. Things You Will Need

    • Utility knife

    • 4-, 6- and 8-inch drywall knives

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    • Non-setting mud

    • Paper drywall tape

    • 120-grit sandpaper

    • Drywall primer

    • Paint scraper

    • Hot mud

    • Mudding tray

    • Fiberglass mesh tape

    Tip

    Both fiberglass mesh tape and hot mud resist cracking, so the combination should provide a permanent repair unless the shifting of the walls is extreme.

    Hot mud is difficult to sand, so it's important to scrape it flat before it stiffens.

    Warning

    Determine the setting time of the hot mud by reading the instructions on the container and mix only as much as you can use in that time. Don't spread it if it begins to stiffen, and be sure to clean your tools and tray before it sets.

References (2)

About the Author

Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. As a landscape builder, he helped establish two gardening companies.

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Deziel, Chris. 'How to Repair Drywall Inside Corners.' Home Guides | SF Gate, http://homeguides.sfgate.com/repair-drywall-inside-corners-41595.html. 10 December 2018.
Fixing wall corners
Deziel, Chris. (2018, December 10). How to Repair Drywall Inside Corners. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/repair-drywall-inside-corners-41595.html

Repairing Drywall Cracks Inside Corners

Deziel, Chris. 'How to Repair Drywall Inside Corners' last modified December 10, 2018. http://homeguides.sfgate.com/repair-drywall-inside-corners-41595.html
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