How to Repair Drywall Seams
By Mark J. Donovan
||Question: Mark, I am finishing a back room in my home and I found your website via YouTube (www.youtube.com/HomeAdditionPlus) on how to tape and float drywall. Your video on how to repair drywall holes was very helpful too. Thanks for the help.
However, I still have one problem. One of the walls in my back room was already finished when we moved in. It was already painted and molding installed. The problem is that I can still see the drywall seams through the paint. Do you have any advice or information on your site as to how to repair a drywall seam. Thanks for any advice that you can provide. (JS)
Answer: JS, Cracks in drywall seams is a common problem that can easily be corrected, but admittedly with some work and mess required. Drywall seams can crack for a number of reasons. Drywall seams can crack because there was insufficient joint compound used when originally taping and mudding the seams, or if insufficient drywall nails or screws were used when installing the drywall. Also, just from the home naturally settling cracks can form.
One of the major advantages of drywall and joint compound is that with a little patience and practice you can usually achieve good results repairing drywall seams.
The slight 32nd of an inch depression, in the process, should be filled in with the tape and joint compound to achieve an overall flush finish with the rest of the drywall panel.
To repair drywall seams and to resolve your problem, rough up the joint area with 100 grit sandpaper so that you can create a good bonding surface for applying additional joint compound. Use a rag to dust off the seam.
Next, use a 10″ wide trowel and apply a couple of coats of joint compound over the drywall seam, applying a slightly heavier amount at the midpoint of the seam and flaring out at the edges. Allow the joint compound to thoroughly dry between applications of joint compound. When applying the final coat of joint compound, known as the skim coat layer, flare out the seams so that they are approximately 10-12 inches wide.
Alternatively you can use mesh tape. Mesh tape has a sticky surface so you can affix it directly to the seam without needing to first apply a thin layer of joint compound.
Apply two additional coats of joint compound over the newly taped drywall seam, flaring out the seam a little wider with each new application. Use a 10” wide drywall knife for applying these two coats and again make sure you allow the joint compound to fully dry in between applications.
After the third application of joint compound has thoroughly dried, use drywall sanding screen or sandpaper to flare out and blend the edges into the drywall panels. Again, wipe the dust off the wall and then apply a primer and paint.
For information on repairing a large drywall hole, see the “How to Repair a Large Drywall Hole” Ebook from HomeAdditionPlus.com. The “How to Repair a Large Drywall Hole” Ebook provides step-by-step instructions on how to repair your damaged wall so that it looks as good as new.
See HomeAdditionPlus.com’s Drywall Calculator
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Additional Drywall Installation Resources from Amazon.com
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