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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.

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    Off topic: Your new wiring doesn't meet code with respect to restraint (stapling). It's also not very neat. Quality wiring is pretty wiring. :) – isherwood Apr 21 '17 at 15:38
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Shim out the framing to get the drywall flush. I've often used 5/8" drywall with no shims, depending on the plaster thickness and patch configuration, but otherwise shim it.

1/8" hardboard is cheap and easy to work with. Or rip some scrap lumber to size. Staple it in place and be happy.

Update: After seeing your photo, I suggest re-cutting your edges with a circular saw and abrasive blade set to depth. You really want a nicer shape to work with. Snap or trace straight lines, level and down the center of studs. Use ear, eye, and respiratory protection.

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Exterior wall, no insulation? Rip the rest of the plaster and insulate, then drywall with no plaster to match. That's a very expensive wall unless you don't have either heat or air conditioning.

1/2" and 3/8" drywall happen to add up to 7/8" if you're pennywise and pound-foolish.

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  • I'm not sure it's a safe assumption that there wasn't insulation there to begin with and that there won't be again. – isherwood Apr 22 '17 at 18:30
  • There is no evidence of any insulation in this photo, including the places where it would remain if some had been removed where the plaster was removed. I looked at the picture at full scale looking for it before I wrote my answer. – Ecnerwal Apr 22 '17 at 22:47
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Agree with the advice to remove, insulate, and replace.

Couple of notes: add nail plates generously where wiring/plumbing is less than 1.5" from the surface of the stud.

Especially if you're tiling (and less so if it's just paint), pay attention to how straight the wall is at the bottom, middle, and top. Shim or shave as needed to get your studs all in the same plane.

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  • How does this address the question, which pertains to drywall thickness for patching? – isherwood Apr 22 '17 at 18:29
  • @isherwood -- it doesn't, and if you feel strongly about it, I'll happily delete it. Your answer (which got a vote from me) was exactly right. Having said that, sometimes a broader view on a problem/solutions can be useful. – Aloysius Defenestrate Apr 22 '17 at 18:50
  • It isn't a matter of how I feel. There are answers, and there are comments. This seems like the latter. – isherwood Apr 22 '17 at 21:18

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