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Old 04-27-2012, 11:27 AM   #1
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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?

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Old 04-27-2012, 12:58 PM   #2
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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.

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Old 04-27-2012, 01:03 PM   #3
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Not going to happen.
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Old 04-27-2012, 01:11 PM   #4
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i suppose you could blow insulation in but that isn't going to work too well either.
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Old 04-27-2012, 02:14 PM   #5
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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.
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Old 04-27-2012, 02:21 PM   #6
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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.
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Old 04-28-2012, 07:43 PM   #7
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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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