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Old 12-31-2009, 09:52 AM   #1
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sheetrock versus plywood

We are rebuilding a walk-in shower in Lake Tahoe and plan to fur out the 2x4 wall to be flush with the ~6 3/4" glulam that sits above the wall (~6.5' above floor) To fur out, we will use 1.5" solid insulation to give this exterior wall a higher R value, then 3/8" plywood running full height (connecting 2x4 wall to glulam above). Since we will be tiling the wall (kerdi plus tile), is there a reason we cannot just leave the 3/8" plywood without sheetrock as the tile substrate?


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Old 12-31-2009, 01:21 PM   #2
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For the Kerdi application check with the Kerdi site to make sure:


Last edited by bob22; 12-31-2009 at 01:24 PM.
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Old 12-31-2009, 04:01 PM   #3
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Bob, thanks and I have consulted the John Bridge site for Kerdi and tile questions quite often :-) The crux of my question relates to using plywood instead of drywall on an interior wall. I cannot think of a reason that using plywood instead of sheetrock is an issue, but wanted to hear opinions from you all. Thanks again!
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Old 01-01-2010, 06:31 AM   #4
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Steve my only thought on it would be not to use either one put up cement board or use thiner ply and cement board but I would leave the sheetrock out
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Old 01-01-2010, 10:42 AM   #5
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It doesn't matter what you use; the whole point about a proper Kerdi installation, done correctly, is that since the back is waterproofed, it doesn't matter - even if you use regular drywall - it'll be kept dry anyway. So anything would do. Even plywood.

That's as far as waterproofing goes - which is one of the things you're trying to accomplish doing this. But tiling is also an important part of what you're doing and here, plywood is not suitable. Doesn't expand and contract under humid conditions the way a solid tile+thinset tile wall does so you get moisture leaking problems.

So, cbu+Kerdi is better.
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