XPS installation

Old 03-17-09, 05:50 AM
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XPS installation

I have a semi finished basement with studs up and against the walls (I know that is not ideal but what I have been given to work with when I bought the house). I would like to insulate w XPS and then dry wall. How much insulating R-value am I losing by cutting and gluing the XPS and to fit between the studs?
Old 03-17-09, 08:06 AM
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you only lose R value of insulation if you lower the thickness, not the length.

if you are questioning how much you lose from the studs being in contact with the foundation without the insulation then wood studs are typically 1.4 R value per inch and low density XPS is around 3.6-3.8 per inch, so you can figure out how much you are losing at each stud depending on the thickness of the studs and insulation
Old 03-17-09, 03:36 PM
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Untreated wood in contact with concrete and below grade is not a good thing. It will rot quickly. HD has a JohnsManville EPS foam that is 2" thick and notched for furring strips. The furring strips fit into the slots and you use tapcons to screw it to the wall(wood does not touch the walls. You can then install drywall on the furring strips. Can't recall what the Rvalue is, I think R10 for a 2" sheet.

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