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Old 02-27-2015, 09:22 PM   #1
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Foam on exterior wall behind tile


I'm getting ready to tear out the fiberglass shower in our master bathroom and install tile. I have a question to ask the experts. The back wall of the shower is on an outside 2x4 wall. I want to remove the batting and spray in closed cell foam 2-3". I will then install a Denshield backer board. Then I'll use Kerdi system prior you putting up tile. Any issues with this process? Am I missing anything?
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Old 02-28-2015, 09:15 AM   #2
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The kerdi membrane is a class one vapor retarder if memory serves me correctly. How are you planning on spraying the foam? You can likely achieve most of the same benefit cut and cobbling rigid foam in those wall cavities.

What does the exterior cladding in those areas consist of?
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Old 02-28-2015, 04:59 PM   #3
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I'm using closed cell foam which mixes from two separate tanks (Foam It Green). This is R6-7 for each inch of closed cell foam. At 3" I can have almost R21.
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Old 02-28-2015, 05:01 PM   #4
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I'm not worried about moisture getting through the kerri membrane but since it and the closed cell foam are water resistance I don't want to trap any moisture and cause mold in the future.
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Old 02-28-2015, 05:14 PM   #5
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Make sure your tank temps are good and only do the foam in small lifts.

CC SPF should be fine. Where is the home and what is the exterior cladding.
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Old 02-28-2015, 05:16 PM   #6
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Central Indiana and vinyl siding on " OSB.
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Old 03-01-2015, 10:30 AM   #7
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That much CC SPF will have a perm rating just under 1 if memory serves me correctly.

As long as you aren't letting any water into the walls from the interior, it should be fine.

Make sure your RH management via fans and ventilation is correct.
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