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Old 12-10-2016, 11:48 AM   #1
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rim joist insulation?


my basement concrete wall is around 60f, but the rim joist area/header is around 50f. the rim already has fiberglass bat, so i'm not sure i need redo the insulation or not. outside is around 32f
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Old 12-10-2016, 04:37 PM   #2
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Re: rim joist insulation?


There has to be at least few hundred post on this one subject.
Tried the search funtion?
Fiberglass does not block air floor and will just end up causing mold.
Need 2" foam and spray expanding foam to seal the gaps.
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Old 12-10-2016, 04:48 PM   #3
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Re: rim joist insulation?


Good read.

https://buildingscience.com/document...m-at-rim-joist
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Old 12-10-2016, 07:04 PM   #4
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Re: rim joist insulation?


ok what rigid foam/board i should use on rim joist. also what caulk i can use on the seam/gap of board.
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Old 12-11-2016, 12:06 PM   #5
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Re: rim joist insulation?


I used Owens Corning R10 rigid foam board. Was about $18 per 4'x8' sheet about 5 years ago. I think I used silicone caulk to seal the edges (the attached pic doesn't show the silicone sealing of the edges). In addition to insulating the rim joists I closed off and sealed the two outside air vents. The crawlspace now stays about 63 degrees all year long. It used to get close to freezing during the winter.
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