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Old 09-15-2016, 09:07 AM   #1
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Rim Joist Insulating


Would you guys use Mineral Wool (rock fiber) insulation or XPS rigid foam to insulate the rim joists to reduce noise when rain/hail hits the siding? Right now the basement is awful loud during a storm. I have mineral wool insulation, but I fear moisture may be an issue if not done properly whereas XPS rigid foam glued to the rim joist seems pretty idiot proof, however, maybe not as good at reducing noise?
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Old 09-16-2016, 12:15 PM   #2
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Re: Rim Joist Insulating


2" of xps is your best choice.

You can always put mineral wool over it.
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Old 09-16-2016, 02:03 PM   #3
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Re: Rim Joist Insulating


I was leaning towards the foam. It seems to reduce some noise. I'll probably just double or triple layer it to achieve more sound deadening.

Any of you guys find a convenient way to insulate the basement wall with foam, but wrap the corner where the sill plate sits? I'm thinking I will just form a little boxed top with XPS to seal off that exposed concrete and sill plate. Depends on how much I insulate the rim joist, I suppose.
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