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Old 11-24-2018, 02:03 PM   #1
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Rim joist insulation?


One corner of my house, in the kitchen, is extremely cold. I can feel a strong draft, the pants in the cabinets are icy cold, and the window above that corner fogs up. I pulled the ceiling tiles in the basement- my view from 2 of the joist "bays" is attached in the pictures. I don't feel any other strong drafts in other spots where the rim joist is exposed.

The house was built in 1948, brick exterior. There was a large opening in the foundation in this area for some type of old laundry vent, but I've filled it in with spray foam (and it's also a good foot under the rim joist).

What's my best option here? Have a spray foam guy come in?
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Rim joist insulation?-20181124_145048_1543089758683.jpg   Rim joist insulation?-20181124_144725_1543089768359.jpg  
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Old 11-24-2018, 02:18 PM   #2
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Re: Rim joist insulation?


I looks dry so any insulation would work but more often now we see foam board loosely fit with a spray foam around the edges to seal it up.
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Old 11-24-2018, 05:36 PM   #3
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Re: Rim joist insulation?


I can usually copy and flip the pictures, not working on these for some reason. Looks like some depth there, is this space an overhang.

Mods, can you flip these, I'm lost.

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Old 11-24-2018, 05:41 PM   #4
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http://imgur.com/a/z67pXrN

Try that link. I'm not sure why the forum attachment keeps rotating the photos.
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Old 11-24-2018, 05:45 PM   #5
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Re: Rim joist insulation?


They were right when I first saw them.
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Old 11-24-2018, 06:12 PM   #6
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Re: Rim joist insulation?


I could not believe the difference in the winter temperature of our under house "garage" that I converted to only a man door when I insulated the rim using Roxul. Lived here for 19 years before my brain kicked in. And I should have known.
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Old 11-24-2018, 06:38 PM   #7
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There is no overhang. The area is uneven, so I'm not sure I'm batts or rigid foam would work well, which is why I'm unsure if spray foam would be best.
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Old 11-24-2018, 06:48 PM   #8
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Re: Rim joist insulation?


Hard to beat spray foam in a situation like that. I've used the DIY kits a number of times successfully, though i'd call a pro first and find out if their price is reasonable.
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Old 11-24-2018, 08:03 PM   #9
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Re: Rim joist insulation?


The dark color in the first picture looks like a moisture issue from condensation.
If the other side of those bricks we see is exposed to the outside then the inside is extremely cold, thus condensation.

Spray foam is good but small jobs are not attractive to big companies. DIY kits might work, but spray foam likes warm weather. Nothing wrong with fitting in rigid foam and using can foam around the edges. Once you have the rigid pieces cut and ready you could add some foam to any big voids that will remain behind it, if you are fast. But leave a 3/8 to inch gap around the rigid so you can ger a good bead of can foam in there. 2 layers of 2" rigid would be nice.

Note, can foam doesn't work well upside down so fabricate a secure straw extension to make working in a tight space easier.

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