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basement insulation - kraft or no kraft?

Posted by homebound (My Page) on
Tue, Jun 19, 07 at 10:40

I've been through all the posts on basement insulation options. Simple question:
To leave the kraft facing on the batts or remove it before the drywall?

location: humid northern Va
mostly below grade
3/4" R-4 solid extruded foam is glued to the foundation wall
2x4 stud cavity
kraft-faced now installed (kraft toward finished side)


(BTW, think the dens armor mold resistant drywall is a good idea or overkill in general? I used it once on another job and that stuff can scratch you up pretty good with it's fiberglass facing. I use my knee to lift drywall sheets, and after a day I has a 2" diameter open brush wound on my knee. Arms were itching like heck, too.)

Follow-Up Postings:

RE: basement insulation - kraft or no kraft?

According to Building Science Corp., as long as you have the foam on the foundation wall, it doesn't make much difference if you leave poly on or not. Kraft-faced is more permeable than poly. So I would leave it and just be sure that basement humidity doesn't exceed 50%.

RE: basement insulation - kraft or no kraft?

That's logical and reassuring. Now I can leave it on without worrying about trapping moisture. Thanks very much.

RE: basement insulation - kraft or no kraft?

Using the Kraft over my 1.5" XPS in a stud wall gives me something to more easily keep the insulation from falling. Can one stapple to the inside of the stud so the outside vertical edge of the stud is available for liquid nails...want to add some beding the drywall. Does sit affect the R Value?

RE: basement insulation - kraft or no kraft?

It will affect the "Arrrrgh! Value" for anyone that has to make some repairs or changes down the road. No reason for liquid nail behind there - stick with the drywall screws.

RE: basement insulation - kraft or no kraft?

Ha! I had heard it (l n) prevents nail / screw pops)pops...better be no trouble back there after all this! Noted though, will use as meant to be used.

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