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Old 05-27-2012, 02:41 PM   #1
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Cementboard and drywall: different thicknesses


I'm fixing some ceramic tile in my shower where some water had gotten in and disintegrated the drywall. The builder (1996) used green drywall on the studs, which I know is obsolete and no longer code. We plan to renovate the entire bathroom and it's one-zillion generic white tiles in a couple of years, so I'm just doing a patch job to fix this area and tide us over until then.

I'm using cement backerboard to butt up against the old drywall (with a vinyl sheet behind). The old drywall is about 1/8" thicker than the backerboard.

Should I use some wood shims on the studs to make the surfaces level, or can I just do an initial 1/8" layer of thinset on the top side of the cementboard to level the two surfaces?
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Old 05-27-2012, 03:14 PM   #2
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Shim it.
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Old 05-27-2012, 04:05 PM   #3
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Quote:
Originally Posted by steveKane View Post
The builder (1996) used green drywall on the studs... T
he old drywall is about 1/8" thicker than the backerboard.
Like maybe they used 5/8" then VS your 1/2" now?

Quote:
Should I use some wood shims on the studs...
or some other 1/8" material
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Old 05-27-2012, 07:43 PM   #4
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He might be using Hardibacker--which is thinner than 1/2"

Rip some shims on the table saw--watch your fingers--(god I sound like my mother)
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Old 06-03-2012, 08:43 PM   #5
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Thanks. Made some shims on my table saw, with blade guard in place, so fingers intact. :-) (Yes, Hardibacker.)
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