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Old 01-25-2012, 05:37 PM   #16
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Insulate below grade family room


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Is there a space between the PT wall or is it tight to the foundation wall?
See above. The PT IS the foundation wall, in my reference. If the PT were inside concrete, I think I'd have the poly outside it, against the concrete, and none inside.

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Old 01-25-2012, 06:08 PM   #17
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Insulate below grade family room


Haven't seen too much of that here in my area.

Do you see much diffusion through through the wood into the wall assembly?

I would use a rigid foam to the PT framing that is Class II vapor retarder so as to allow drying to the inside.
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Old 01-25-2012, 07:54 PM   #18
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Insulate below grade family room


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Haven't seen too much of that here in my area.

Do you see much diffusion through through the wood into the wall assembly?

I would use a rigid foam to the PT framing that is Class II vapor retarder so as to allow drying to the inside.
PT basements, I don't think, are that common here anymore, either. I think ICF's have made them obsolete. Were I to build a basement again, like we did w/ my son's a couple of years ago, I'd go w/ ICF's. We built my basement w/ PT wood in '80, and so far it is as dry as a bone. Our soil is fairly dry, as far as I can tell, and I have a serious grade away from the house, plus 3' overhangs on one side and a 12' closed-floor deck on the other side. As always, the best thing to do is to keep water away. In low areas w/ high water tables, I'd not recommend PT in basements, though they may work. I agree w/ drying to the inside.

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