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I am patching some plaster with some drywall and have shimmed out the drywall. The issue is that the plaster isn't a consistent thickness. Some spots it's flush and others its off by 1/8". What's the right course of action to level these out? Paper or fiberglass tape with that big of a difference would make the bulge worse. Heard of a product called fibafuse that might be good for this? Recommendations?enter image description here

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With uneven work like that you will have to build up the sheetrock side I use a wide mud knife at least 12" when trying to cover uneven areas, as far as the kind of tape paper or fiberglass I use both but preferr fiberglass in this case as it helps reduce cracking. Also I would not do in 1 coat but use several thinner layers. For areas like this I will use "hot mud" because it sets quickly and in some cases as soon as the first layer is complete the starting area is dry just don't mix two much up or you may have a mud tray that turns into a brick before you get done. The last caution is hot mud is tough to sand so I will put my base coats on then a thin layer of topping mud very easy to sand but it takes a day to dry.

  • are you saying that in addition to tapering towards the low side I will have to build up a bit on the high side as well? – kaminsknator Dec 5 '18 at 21:01
  • You need to bridge the crack with mesh or paper or it will show, you may be able to sand some material down so the bump will not be noticeable but if you only fill the crack it will show later that's why we use paper or mesh. – Ed Beal Dec 5 '18 at 22:37
  • I believe he means build up wherever it's low. The picture is somewhat of an optical illusion, at first glance it appears that the drywall side is low but if you decipher the way the measuring tape is held between the two sides you can figure out the plaster side is the low side. – Platinum Goose Dec 6 '18 at 21:45
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I would sand down the plaster side, about 6-8 inches in from the joint, then add tape and feather out as normal. There really is no other way to mask the rise that would be seen from adding taping compound over the existing plaster. Save for adding a ridiculous amount of compound to the new drywall.

  • If the drywall is higher should I sand down the drywall side? – kaminsknator Dec 10 '18 at 16:49

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