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steve31 08-21-2008 05:52 PM

Insulating a daylight basement

I live in the PacNW and our house has a daylight basement. The basement is framed in already and is ready for insulation. I'm not sure what the best methods are for this task. Against the concrete walls it's approx 5-6 inches deep between the studs.

Against the walls without concrete (above walls) I assume I can just use batts insulation. Correct?

What practices should I use against the concrete walls? Is it better to use polystyrene foam or batts? I assume a vapor barrier will be required is requierd? Does the vapor barrier go on the inside over the studs/insulation?

Thanks for your time.

Termite 08-21-2008 09:14 PM

Some people put a poly moisture barrier between the studs/insulation and the concrete wall. The kraft facing on the insulation is a vapor barrier itself. It can be argued that two vapor barriers can create a dead spot in the wall between them that doesn't breathe.

I'm a fan of using foamboard against the foundation wall behind the framing, and conventionally insulating the wall cavity with kraft faced fiberglass batts (no poly vapor barrier).

steve31 08-22-2008 11:15 AM

Thanks for the reply.

Do you put the foam board right against the wall? How do you fasten the foam? What is the kraft face?

Termite 08-22-2008 02:33 PM

Kraft face is like a brown paper grocery sack. It comes on batt insulation.

I wouldn't worry about "fastening" the foamboard to the wall. No point in it. Use spray foam like Great Stuff to seal gaps and such...The spray foam will also do a heck of a job securing the foamboard.

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