Quote:
Originally Posted by speede5
I doubt anyone will agree with me but if there are no outlets on this wall and the tops and sides are sealed you will never have a problem. A couple good coats of oil based paint will make the entire wall a vapor barrier. Water vapour travels in the moving air through holes (outlets). It will not travel through firerated drywall in any capacity capable of causing harm. if you can see the base of your wall, run a bead of acoustic sealant along the sill, make sure there are no moisture paths throught the top and sides and relax. Also if there are no outlets, there is no reason (unless there is a code out there I don't know of) you couldn't vapour barrier over the firerated drywall and cover with another layer. The second layer is only going to increase your firerating.
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That's what I was just about to add to the thread; glad I read all the way to the bottom...
You'll actually get the same effect (without the mess/stink of oil) if you just use a couple of coats of a
high quality semigloss 100% Acrylic (i.e. "kitchen and bath") over a standard drywall primer. The "mistint" section of the local paint store is your friend for such a purchase...
5/8" "Type X" drywall is
bulletproof in comparison to 1/2" "standard".
If you're worried about plugs, buy those foam rubber seals that fit under the faceplates of the outlets...they work both ways. The demising wall (as described) is almost certainly a proper firewall, with 2 staggered 2 x 4 walls, each batted with R-14 rockwool insulation (with an air gap between these two walls). Such a wall construction will outperform a "standard" 2 x 6 exterior wall (and by a considerable margin) thermally.
Problem solved.