Designing Kitchens and Bathrooms - Moisture barrier? where?
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Djsrcy
10-30-07, 09:22 AM
I am fairly new to interior home projects. I am down to studs and subfloor in my bathroom. I keep reading about moisture barriers on the floors and on the walls. I am goint to lay cement board on the subfloor then ceramic on top of that. I have a surround for the tub area and just planned on using a water resistant drywall everywhere else. Where do I need moisture barriers in this room!?
joeperi
10-30-07, 11:50 AM
Given that you are using a tub surround and moisture resistant drywall everywhere else, use kraft faced insulation on all exterior floors, walls and ceiling. That should be all the vapor barrier you will need. Good luck!
cwbuff
10-30-07, 12:02 PM
I agree with Joe except I would install insulation on the interior walls also for sound dampening. Unfaced with a plastic vapor barrier might be cheaper.
If you are planning on using greenboard you may want to reconsider. If mold is an issue, paperless might be the way to go.
Properly applied and maintained paint is also a good moisture barrier.
If you are planning on using greenboard you may want to reconsider. If mold is an issue, paperless might be the way to go.
Properly applied and maintained paint is also a good moisture barrier.
Djsrcy
10-30-07, 12:38 PM
I agree with Joe except I would install insulation on the interior walls also for sound dampening. Unfaced with a plastic vapor barrier might be cheaper.
If you are planning on using greenboard you may want to reconsider. If mold is an issue, paperless might be the way to go.
Properly applied and maintained paint is also a good moisture barrier.
what about the floor? Do I need to put a membrane over the backer board? Should it go subfloor, thinset, backerboard, more thinset and tape on seams, waterproof membrane, then the mortar and tile?
If you are planning on using greenboard you may want to reconsider. If mold is an issue, paperless might be the way to go.
Properly applied and maintained paint is also a good moisture barrier.
what about the floor? Do I need to put a membrane over the backer board? Should it go subfloor, thinset, backerboard, more thinset and tape on seams, waterproof membrane, then the mortar and tile?
joeperi
10-30-07, 01:31 PM
Unless you are planning on having the floor in constant direct water contact (as you would with shower walls) you don't NEED a waterproof membrane on the floor. The occasional wet floor from bathing children or stepping out with wet feet from a shower or bath shouldn't be a problem. However, if you prefer to do so, then you can do it as you described.
cwbuff
10-30-07, 05:17 PM
Plastic vapor barrier would go under the cement board, but I don't know anyone that uses it on the floor. As Joe posted a little casual water isn't a problem.
Last year I renovated a bathroom in a 60 year old house that had no vapor barrier protection. Two of the walls were plaster (probably original) and two were drywall. There was no moisture problem with any of the framing, probably because of paint.
Last year I renovated a bathroom in a 60 year old house that had no vapor barrier protection. Two of the walls were plaster (probably original) and two were drywall. There was no moisture problem with any of the framing, probably because of paint.