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Shower Corner - Vapor Barrier/Waterproof Membrane
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We are in the process of fixing up our cabin and I can't find any info on the following:

1. the shower rectangle shower base will be placed in the corner of the bathroom abutted to two exterior walls. Whole place is 2x4 framing wood everywhere.

2. Shower base is your generic 60 x 32 inch rectangular pan. In the two wall against it I intend to stuff insulation batts into the cavities. What I am struggling with is the following:

3. Everything I read about waterproof membranes is that it doubles as a vapor barrier. What I can't find is a water proof membrane that would affix to the studs themselves. Everything I come across is to for tiling which we are not doing.

4. I want to sandwich: 2x4 studs + insulation batt + vapor barrier/waterproof membrane + T+G cedar planks vertical (which will obviously be sealed)

Removing the waterproof membrane for a moment, and put in a vapor barrier, do I finish nail the planks through the vapor barrier to the studs? Should I be sealing that up somehow? Like wise with a waterproof membrane, do I nail through the planks and through the waterproof membrane to the studs or must it also be prepped to self seal in advance? The only thing I can think of if necessary is painting all the faces of the studs with vapor barrier sealing in advance, so that when the nails are driven through that forms a seal around them.

Is this necessary? Do I actually need a waterproof membrane if I am not tiling or using a backer board? What membrane sheet can I use, so far all I find is its either just thicker vapor barrier plastic or specialized material to accept mortar and tiling on it.


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