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We've removed damaged drywall on our bathroom walls, and would like the walls to be thin tongue-and-groove planks. Is anything material except the tongue and groove required on the studs?

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    What's "tongue and groove"? Dimensions? Species?
    – isherwood
    Jun 28, 2016 at 18:01
  • Your fire codes probably require you to put 1/2" DW on the walls, and 5/8" DW on the ceiling, minimum.
    – Mazura
    Jun 28, 2016 at 23:03

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You should be careful in your choice of wall paneling material and its preparation. Not all T&G planks are suitable for walls period, and fewer still are suitable for bathrooms. Ensure your planks are sealed on all sides to minimize risk of warping.

For more flexibility, install a standard drywall wall surface. Then you can attach decorative paneling over that without compromising critical functions of the wall.

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    Wow, I totally disagree! you would not want a vapor barrier on the wall this would really set up a problem if there is already one on the outside. Any tong and grove should be fine for a wall. I have made some awesome patterns out of cedar cut on 45's creating a small diamond in the center of the wall and worked out it was a real selling point on 1 house.
    – Ed Beal
    Jun 28, 2016 at 19:34
  • I wouldn't say "any". My folks have a lake home with 1/4" pine t&g on the walls over foil-faced insulation panels. In the winter, when they aren't around as much, the wood shrinks to the point that you can see silver in places. I'd go 1/2" at least, or put it over a solid panel backer.
    – isherwood
    Jun 28, 2016 at 20:47
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    @Ed Beal Moisture barriers are a highly contentious issue. I would suggest what Shimon Rura recommends is correct... except -- as you point out -- for bathroom walls that are opposite exterior walls.
    – JS.
    Jun 28, 2016 at 20:53
  • I was thinking of exterior when I wrote that but the OP was not specific on where they were.
    – Ed Beal
    Jun 28, 2016 at 21:43
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    "Moisture barrier" ≠ vapor barrier.
    – iLikeDirt
    Jun 29, 2016 at 20:14

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