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Old 03-02-2012, 06:35 PM   #1
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XPS for rim joist


When using XPS foam to insulate and seal the rim joist in a basement does the foam need to be right up against the rim joist or can you seal off the cavity at any point?

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Old 03-02-2012, 06:53 PM   #2
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XPS for rim joist


Tight to the rim, you do not want any air space.

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Old 03-02-2012, 06:55 PM   #3
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XPS for rim joist


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Tight to the rim, you do not want any air space.



That right there.
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Old 03-02-2012, 07:34 PM   #4
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XPS for rim joist


That's unfortunately what I thought. With the cavity being used as a wire chase, not possible. Don't think foam is a viable option since I'd have to de rate the wires encased in it. Any thoughts?
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Old 03-02-2012, 07:46 PM   #5
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XPS for rim joist


As long as it is airtight, the offset is not that bad.

Cut the foam tight to the framing and seal with foam or sealant. You will still be stopping the air loss/gain which is the bigger issue when it comes to energy loss.

If you want, stuff some rockwool in there before you put the foam back and seal it.
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Old 03-03-2012, 02:03 PM   #6
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XPS for rim joist


Or, poke a hole or two in the foam board and squirt in GreatStuff or the like; good luck re-wiring in the future, though.
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Old 03-04-2012, 01:34 PM   #7
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XPS for rim joist


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Or, poke a hole or two in the foam board and squirt in GreatStuff or the like; good luck re-wiring in the future, though.

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Old 03-04-2012, 02:03 PM   #8
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XPS for rim joist


Yeah, some folks are just looking for the quick and dirty answer, so I thought I'd throw that one out. If the house is almost expired anyway, it may be applicable. I'd hate him/her forever if I ever had to re-wire in there, though.
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Old 03-04-2012, 11:35 PM   #9
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Yeah, some folks are just looking for the quick and dirty answer, so I thought I'd throw that one out. If the house is almost expired anyway, it may be applicable. I'd hate him/her forever if I ever had to re-wire in there, though.
Nope just looking for the right answer. Think I got it. Thanks all!

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