Patching 7/8" plaster with drywall?


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Old 04-21-17, 08:31 AM
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Patching 7/8" plaster with drywall?

We had to take down several large sections, about 6x4ft sections, in order to run updated electric. The problem is that the 3 layer plaster is 7/8in thick. What is my best solution to put up new even thickness drywall? Most of it will be hidden under our new kitchen cabinets. Thoughts? Thanks!
 
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Old 04-21-17, 08:37 AM
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Use whatever drywall you can to get the drywall just short of the plaster (maybe two layers of 3/8" or 1/2" and 1/4") and then you can fill in with setting or joint compound to match.
 
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Old 04-21-17, 08:37 AM
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You could do a layer of 1/4 and a layer of 5/8 sheetrock, then tape and mud the seams as usual.

Or two layers of 3/8 sheetrock, tape the seams and then 1/8 skim coat over the whole area.

The first method is usually easier for those of us that don't do rock all day; the second method probably gives a flatter surface if you are good at skim coating.

You may have to find a sheetrock or interior supply house to get 1/4 sheetrock; not all the box stores stock it. Or 3/8 for that matter.
 
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Old 04-21-17, 08:43 AM
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If you have a table saw I would rip some shimming material to bring the new drywall out to perfectly flush. Building out a large area like that with excess mud is a pain even with experience. Working with the wood is much easier.

If no table say then still can be done with multiple layers of something thin to achieve the required thickness.

Bud
 
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Old 04-21-17, 10:47 AM
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Use strips of 3/8" plywood on the studs and use " Sheetrock. You could buy a pre-cut 2'x4' or 4'x4' piece at BigBox to rip for your strips but a whole sheet might be as cheap.
 
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Old 04-21-17, 11:19 AM
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I'd shim and use 1/2"drywall [unless another size was handy] I prefer to have the drywall just shy of the plaster so I can skim coat and get a seamless repair.
 
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Old 04-22-17, 11:27 AM
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The shims are working great. Next question, I have never done drywall around metal mud rings. I assume I cover the box up to the ring like the picture shows? Since the sheetrock is thicker, do I just get a metal extender? I have used the plastic ones on my outlet boxes, but wasn't sure in this situation. Thanks for the help.

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Old 04-22-17, 12:54 PM
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Best thing to have done would have been to replaced the rings with deeper ones or even an adjustable ring. I don't know of an extension that works well on a metal mud ring; maybe someone else here knows of one.
 
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Old 04-22-17, 12:58 PM
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Any standard box extender will work just fine: https://www.amazon.com/ARLINGTON-IND...n+box+extender
 
 

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