insulation basement wall

brettly

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

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

Not going to happen.

itsnotrequired

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

brettly

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

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

Gary in WA

The foam board should be air-tight: http://joneakes.com/jons-fixit-database/743

http://www.buildingscience.com/docum...study-analysis

Gary

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