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Unread 12-29-2005, 09:57 PM   #1
dwb1957
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Moisture barrier not allowed behind "wet walls" per code?

Our county code apparently doesn't allow any vapor barrier behind CBU on wet walls...They want the moisture to "go somewhere", not get trapped...How does that sound? North Idaho.

My new tub/shower surround is on an outside corner of addition. I have an Americast tub with the thick flange (no way to overlap)...I plan bringing wonderboard down on top of the securing screwes for the flange, leaving a gap between the wonderboard & the top of the flange...I would imagine the silicone @ that gap & drop the tile (free hanging) to within 1/8"(?) of the tub & matching color sanded caulk.

Do the securing flange screws get removed to eliminate possible squeeks, or just let the wonderboard sit on top of the screws?

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Unread 12-29-2005, 10:04 PM   #2
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I live in lewiston and thats not true, someone has told you wrong
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Unread 12-29-2005, 10:05 PM   #3
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Kootenai County...Coeur d'Alene.
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Unread 12-29-2005, 10:06 PM   #4
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I cant imagine that being true?????
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Unread 12-29-2005, 10:08 PM   #5
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I couldn't either...How's the steelhead runs?
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Unread 12-29-2005, 10:12 PM   #6
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slow but steady, its all about the chukar for me right now though,lol
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Unread 12-29-2005, 10:19 PM   #7
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Can you fir out youre studs to compensate for the thickness of the flange, then drop your board lower???
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Unread 12-29-2005, 10:20 PM   #8
dwb1957
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Brian, have you dealt w\ the Americast flanges...What approach do you take w\ the CBU?

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Unread 12-29-2005, 10:22 PM   #9
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Sorry, typing @same time...The drywall is done (with primer as Vapor Barrier), leaving just the insulated outside walls..I'm puttin up the wonderboard this weekend.

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Unread 12-29-2005, 10:24 PM   #10
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Im not sure if ive seen what youre dealing with, but we usually fir out the studs and drop the board to within1/4 inch of the tub and fill gap with silicone, then tile the walls.

Primer as moisture barrier????? not following ya???
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Unread 12-29-2005, 10:33 PM   #11
dwb1957
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Insulators are getting away from plastic on the inside walls & the painters are spraying PMB on the drywall. Must be our "cold" climate vs. your mild climate?

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Unread 12-29-2005, 10:40 PM   #12
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youre wet area should not have any drywall in it, unlesss youre going to use kerdi???
My thinking was you have a tub installed and your exposed framing needed shimmed out to allow youre backerboard to overlap youre flange so you can then tile youre walls, drywall was not in the equation????
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Unread 12-29-2005, 10:48 PM   #13
dwb1957
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Greenboard surrounds outermost edges of shower area & vanity wall...The drywall co. left the roughly 30" deep X 66"H tile area open to install concrete backer board (he preferred denshield)...This drywall company does strictly high-end homes. I trust them. Our local code jurisdictions have always been on the cutting edge (or over the edge) for years.

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Unread 12-29-2005, 10:56 PM   #14
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So if you shim the walls out you will have a problem tying back into the drywall????
HMMMMMM???
I would stop the board at the top of the flange, then back fill the flange area
as i tiled the bottom row.
Someone else might have a better idea???
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Unread 12-29-2005, 10:56 PM   #15
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I'm not understanding this either, Dave. Perhaps you can get us a copy of the specific code you're following for this and post it here.

Maybe there is some misunderstanding. What we (and, of course, the TCA) want you to install behind your CBU shower walls, interior or exterior, is a moisture barrier. I can undertand your local code not wanting a whole-house vapor barrier (retarder, actually) for all the exterior walls, but behind the shower walls they should be following the installation guidelines for shower construction, not those for the insulation package.

As for wanting moisture in the exterior wall cavities to "go somewhere," we all want that. And usually we want it to go outside through a properly constructed exterior. We're sure as hell not gonna try to get it to "escape" into a properly constructed shower.

And Bryan is trying to get you on the right track as far as installing the CBU with that tub. You really want to have that CBU over the flange. You can find a way to deal with the wall outside the shower.

My opinion; worth price charged.
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