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brettly 04-27-2012 11:27 AM

insulation basement wall
I have opened up the floor to my bedroom down to the floor joists. The bedroom is on the second floor and plan to add insulation too the space. My basement wall cavity is exposed now and can see there is no insulation in the space between the basement stud wall and the cinder block wall. my basement is a rental so I cant access thru the basement wall. I can access from the top easily, what is the best way to insulate this space from the top?

cortell 04-27-2012 12:58 PM

Um, I don't know any way to effectively install foam board insulation from above. You can drop down the boards into the space, but unless they're firmly adhered to the concrete block, with tight joints in between them, I don't imagine they're going to perform very well, if at all.

joecaption 04-27-2012 01:03 PM

Not going to happen.

itsnotrequired 04-27-2012 01:11 PM

i suppose you could blow insulation in but that isn't going to work too well either.

brettly 04-27-2012 02:14 PM

insulate basement cinderblock wall
I was thinking of installing rigid foam against the cinder block two layers and stagger the joints trying my best to keep the joints tight. Other possibility fold vapor barrier in half slide folded end into the opening and fill with cellulose or fiberglass insulation.

cortell 04-27-2012 02:21 PM

If you're willing to double up like that, and stagger, and the result is'll probably be partially, and maybe even sufficiently, successful.

Gary in WA 04-28-2012 07:43 PM

The foam board should be air-tight:


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