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Old 05-17-2018, 11:54 PM   #1
Topspin
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Moisture Sandwich Relief?

Got one I've never run into before. Concerned about how to handle this shower Moisture Sandwich.

Below grade concrete foundation wall has 6 mil poly on the inside of it. Then 2x4 on the flat with EPS stryrofoam insulation to go inbetween studs. Then will be waterproof board (assume Wedi Board/Go-Board, will see tomorrow).

Issue - waterproof board is waterproof and pretty much vapor proof. 6 mil Poly is pretty much vapor proof AND Styrofoam insulation is pretty much vapor proof but will be gappy around studs.

I wont put up a waterproof board over paper backed insulation without slitting the paper for fear of moisture sandwich issues. So what to do when I have 6 mil poly and Styrofoam??

Had I to hazard a guess - the poly is not necessary and could be slit or removed, and the styro will have enough gaps around sections that it wont be too air tight anyway.

So . . . slit the plastic, stick in the foam insul then board it up? Doing it on Friday. Sorry, just opened up the wall this afternoon.
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Old 05-18-2018, 03:49 AM   #2
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I think you have a plan. Not sure what else you could do.
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Old 05-18-2018, 08:37 AM   #3
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Use 1" foam so there is an air space between the flat-wise studs?

Notch that plate above the flat-wise studs so the lower airspace communicates with the upper stud bay?

Or instead fir out the whole wall 1/2" to provide a continuous air space?

Just throwing out some ideas.

Cheers, Wayne
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Old 05-18-2018, 08:44 AM   #4
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Thanks Kevin and Wayne. Good ideas
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