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Old 05-01-2013, 01:57 PM   #1
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Preventing Rot/Vapor Issues in Bathroom


The pictures show where the shower used to be. You can see the stucco is the only thing left in spots. The house is in zone 4c (Tacoma, WA), it was constructed in the early 1950s and the exterior wall, sill, rim joist and a few floor joists all needed to be replaced. Now that its done, it's time to insulate.

I was thinking spray foam would be best, but it's not in the budget. I have been researching Roxul and it looks like good stuff. It's 3-1/2" thick, R-15, and is unfaced. Any recommendations for the vapor barrier?

Since the original wallboard was rock-lath and plaster, it is more than 3/4" thick. To match the new with the old, I was thinking of using 1/2" polyiso foil-faced board under 1/4" drywall as the vapor barrier. I got the idea from Gary in WA in this thread (although in this case it's a ceiling.) insulating living space over garage

Any ideas or recommendations for the vapor barrier, or will my idea work?

Thanks,
Tom
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Old 05-03-2013, 12:26 AM   #2
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Preventing Rot/Vapor Issues in Bathroom


Good job! Just add solid blocking at the panel edges for shear as we are in a seismic zone.... I'll give you some light reading first, then discuss it; http://docs.google.com/viewer?a=v&q=...sNmmYf-psHZnLA

http://www.ewpa.com/Archive/2006/aug/Paper_296.pdf

http://www.buildingscience.com/docum...-analysis/view

Brainy membrane HEM_23-4_p37-40.pdf (application/pdf Object)

Describe the wall material make-up; http://www.buildingscience.com/docum...researchreport

Gary

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Old 05-03-2013, 08:27 PM   #3
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Preventing Rot/Vapor Issues in Bathroom


Man you did a fine job on fixing that!
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Old 05-04-2013, 04:10 PM   #4
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Preventing Rot/Vapor Issues in Bathroom


Other than the king stud/trimmer hinge joint at the old window double sill... with plywood keeping it in flex. Add a vertical scab to strengthen.

Gary
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