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Old 09-11-2009, 08:19 AM   #1
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kerdi/redgard over easyboard over 6 mil poly


Hi everyone,

I'm new so be gentle.
I am currently renovating my main floor bathroom and gutted everything. One of the walls is a concrete exterior wall that I want to insulate with batt unfaced insulation. What I'm planning to do is put a roofing paper first on the concrete wall then frame 2x4s, insert the batt then put the poly. I bought some 1/2" Easyboards and planing to put Kerdi for waterproofing. Is Kerdi over Easyboard over the 6 mil poly okay? Since Kerdi also acts like a water/vapor barrier then it's like sandwiching the Easyboard in between 2 barriers and some say it's not good.

What do you think?

I'm up here in Canada.

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Old 09-12-2009, 09:44 AM   #2
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kerdi/redgard over easyboard over 6 mil poly


never have two vapor barriers. Having any vapor barrier against the concrete wall is a no-no let alone two. No poly, no tar paper. Leave a 1" space between the concrete and the studs to allow the wall to dry when needed. Use 2" foam panels against the concrete.

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Old 09-12-2009, 01:33 PM   #3
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kerdi/redgard over easyboard over 6 mil poly


http://www.buildingscience.com/docum...gs?full_view=1
Be safe, Gary
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Old 09-14-2009, 01:03 PM   #4
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kerdi/redgard over easyboard over 6 mil poly


Thank guys...

I will just do rigid foam (I can only find 1 1/2" from local HD) then 2x3 wood studs (to save space) then Easyboard then Kerdi for wateproofing.
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