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Bcoleman6 03-19-2008 01:28 PM

Basement framing insulation question
My basement has been previously framed with 2X4 turned sideways. My original idea was to use 1.5" foam in between the studs and tape the seams to the 2X4 and then drywall. Can I do this or do I need an air gap? If so how big?
If I can't do it this way I am willing to remove it all and go foam against the wall then frame. At least I can reuse the studs and will have way more room for electric. Still hoping the first option will work.


AtlanticWBConst. 03-19-2008 02:46 PM

Are you saying that the 2x4's are KD grade, and attached on-the-flat, directly against the concrete foundation walls?

Bcoleman6 03-19-2008 03:04 PM

No sure on the grade. But yes the 2X4 are on the flat and directly on the concrete walls. So if I use 1.5" XPS in between the studs it will line up perfectly with the interior edge of the 2X4 and thus leave no air gap between the XPS and the drywall.

AtlanticWBConst. 03-19-2008 05:42 PM

Is the lumber KD grade or Pressure Treated?

Bcoleman6 03-21-2008 03:37 PM

It looks like it is not pressure treated. The lumber is stamped S-P-I or maybe the I is a N, hard to tell. The basement was finished in the seventies or so.

I think I am going to reframe it. I plan on using dricore on the floor and framing over the dricore. That being said do I still need pressure treated on the bottom plate?

AtlanticWBConst. 03-21-2008 06:37 PM

Because concrete is porous and has a degree of moisture content in it, you should consider using Pressure Treated lumber, and closed cell foam.

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