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Unread 12-02-2013, 05:03 AM   #1
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basement shower rear wall ICF (insulated concrete form)

doing a shower in a basement the rear wall is ICF insulated concrete form which is basically 2" of EPS foam over a concrete wall with plastic tyes every 8"

has anyone gone over this substrate before? the wall is out of plumb leaning out 1/2" over ten feet

I was thinking of using kerdi board with a compatable adhesive maybe kerdi fix to plumb it up

anyone have any other better suggestions or ever done a shower with an icf wall

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Unread 12-02-2013, 07:44 AM   #2
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Hi Tralfaz,

No experience with that surface, but I have used Kerdi-fix to attach Kerdi-board to wood studs, building globs of it up to about half an inch to plumb the boards. I held the board in place with a few screws until it set up.

Schluter didn't exactly sprinkle holy water on my head for doing that, though. Get hold of your rep.
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Unread 12-02-2013, 04:27 PM   #3
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I've done showers in the past over icf.

I've used cbu...but your method sounds fine. I'd like mechanical fasteners into the ties though

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Unread 12-02-2013, 10:08 PM   #4
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There should be plastic strips embedded in the blocks every 16" that serve as studs. You just screw your cement board (or kerdi board) right to the wall. You can also attach 2x2 furring strips to the ICF, tapered the right amount and then treat it like conventional framing. You can also attach Kerdi directly to the styrofaoam just like you would to a Schluter pan, but I've never been adventurous enough for that.
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Unread 12-03-2013, 05:18 AM   #5
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why not just build a wall inside of the exterior wall.
Maybe 10-2x4's and a hour or so. In a basement there should be enough room for the increase in layout.
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