Should I Put Felt Paper Over The Bathroom Studs?

I’m down to studs in the major bath remodel. I just put in insulation. Next goes the cement backer board, but I heard it’s a good idea to add 15 lb felt paper. Is this necessary/a good idea?
If so, should I only put it under the backer board or under the drywall above the backer board (obviously not putting it behind other areas)?
And do you just staple it to the stud or add something else? I read somewhere that people use roofing adhesive?
Thanks!

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This entry was posted on Friday, February 5th, 2010 at 2:52 am and is filed under Adhesives. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

5 Responses to “Should I Put Felt Paper Over The Bathroom Studs?”

  1. Yes you ll need to put the felt just behind the cement board .. Behind the green board thats above your cement board wont hurt but you don t need to. All you need to do is tack it up or staple it in, your choice.. I see a few poster can t read what you wrote.. Unless you have a high ceiling or a vaulted ceiling and since you have it all ripped out. I d suggest going to the ceiling w/ the backer board. It ll make for easier transitions from the tile to the green board and the cost isn t that much difference.. Any questions you can e mail me thru my avatar and check my qualifications there . GL

  2. I used 15lb roofing felt as my moisture barrier on my bathroom wall. If your insulation is paper faced cut some slashes in it before installing the felt over it. You don’t want 2 moisture barriers. Start at the bottom and install horizontally and staple to the studs. overlap the next piece by at least 6″ and continue up the wall to the ceiling. Actually only the exterior wall needs this but I insulated all 3 walls around my shower and applied felt for soundproofing. You can then install your backer board and drywall above the backer board. If it’s a shower or tub/shower be sure to go up at least 6′ from the drain with the backer board and then install your drywall above that.

  3. Yeah, why are you putting greenboard over the backerboard?
    Not a good idea.
    The tiles go directly on the backerboard.
    Are you trying to raise it up to be flush with part of the wall?
    You can use furring strips for that.
    You do want some kind of moisture barrier on the studs and 15# felt works good for this.
    Staple it to the studs.
    No roofing adhesive is needed.
    Then the greenboard, if needed.
    Then the backerboard.
    Then your thinset and tiles.

  4. First of all, ‘backer board’ is meant for tile installation, why would you cover it with drywall?
    Secondly, I have never heard of using roofing felt indoors for any reason, in front of or behind backer board.
    I think someone fed you some faulty information…

  5. I would put it behind backer board and sheet rock, attached with staples (nails are going to penetrate it anyway when you hang the cement backer board and sheetrock). Be sure to lap the felt properly because the backer board is porous and will definitely allow water to penetrate. Good luck.