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Adding Insulating Behind Shower Wall

 
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Old 08-31-2017, 11:59 AM   #1
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Adding Insulating Behind Shower Wall


Hi, building a new shower that has one wall (no plumbing) on an exterior wall. Client says original construction from outside is double brick, vapour barrier/slats, and drywall. I framed for a 3" wall in front of the old drywall to add insulation, but now I'm not sure how to handle it. Do I need to remove old drywall or let it stay? From the outside in, should it go double-brick, vapour-barrier, unfaced insulation, then shower wall? She wants Kerdi membrane on CBU so I don't want to create a "moisture sandwich" and Kerdi says no vapour barrier behind CBU. Or is it okay to leave the drywall and just add some insulation between the old drywall and the CBU? Any advice would be appreciated.
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Old 08-31-2017, 09:52 PM   #2
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Re: Adding Insulating Behind Shower Wall


unfaced, Roxul or foam board safest. Just no plastic, foil or kraft facing

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Old 09-01-2017, 04:39 PM   #3
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Re: Adding Insulating Behind Shower Wall


Thanks, Tom. Just took a peek and it's actually brick with tar paper, then foil backed drywall. Would you remove the old drywall?
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Old 09-01-2017, 05:04 PM   #4
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I would
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Old 09-01-2017, 05:20 PM   #5
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Old 09-01-2017, 05:21 PM   #6
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Re: Adding Insulating Behind Shower Wall


You shouldn't be getting moisture from the back of the shower wall, so it shouldn't really matter. It would be a dry sandwich.

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