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Randell Tarin 03-23-2008 09:19 PM

Wall Prep for new bath tub
My wife and are building some guest cottages with plans of opening a Bed and Breakfast. We are doing what we can to save money and subcontracting the rest.

The framers have finished the dry-in, and most of the rough-in plumbing has been done. One of the next projects will be to install two 5' steel bath tubs.

The tub surround enclosure will be tiled to within one foot of the ceiling. I plan on using 1/2" Hardie-Backer as underlayment for the tile. The walls are to be insulated with R-13 fiberglass batts.

Question: Besides the backer board, do I need to do anything else to prep the wall. Will this and the tile be sufficient to seal the wall? the area above the tile within the enclosure, what kind of wall board should I use? I know from other threads here that I should not use GREEN BOARD.

Ron6519 03-23-2008 10:50 PM

Make sure you use a plastic vapor barrier(6ml) between the unfaced insulation and the backer board. Run both the insulation and vapor barrier, floor to ceiling, not just above the tub.
There's a new fiberglassed faced drywall that's good to use in this situation. The name escapes me at the moment.

Randell Tarin 03-23-2008 10:55 PM

I know what your talking about. I think it's purple in color. It was mentioned in another thread.

I'm concerned about using a plastic vapor barrier. Would you have the potential for mildew?

Ron6519 03-23-2008 11:28 PM

In a dry environment, mold and mildew will not grow. Moisture from the inside or exterior should not get into the wall if the structure is built and maintained properly.
Plastic is THE vapor barrier of choice. A continuous, seams taped vapor barrier will eliminate water from getting behind it. It will also eliminate warm air and cold air from coming into contact with one another and forming condensation in the walls. The insulation needs to be neat and completely fill the cavity. No spaces left on the top or bottom.

AtlanticWBConst. 03-24-2008 03:21 AM

As stated already: install a poly vapor barrier over the studs and insulation (behind the cement board). Be sure to use UNFACED insulation batts, so as not to create a double vapor barrier.

Good luck on the project and also the B & B business.

Randell Tarin 03-24-2008 06:29 AM

Thanks. Good advice.

Randell Tarin 03-25-2008 11:26 PM

I installed the insulation and vapor barrier today. It turned out very nicely.
Using rolled 6 mil poly, I was able to have a continous vapor barrier in the tub area with any seams. I used Owens-Corning plastic tape and foam to seal any cracks or seams. I think it should work fine.

Thanks again!:thumbsup:

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