Rim Joist Insulation (Joist Sides Insulation)

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DesignedtoRun
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Joined: Mon Jan 16, 2017 11:56 am
Location: Thunder Bay, ON

Rim Joist Insulation (Joist Sides Insulation)

Post by DesignedtoRun » Fri Nov 09, 2018 4:18 pm

What would be the best way to insulate the rim joist (along the sides of the joists), not the joist ends? I'll attach pictures to more easily explain.
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Shannon
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Re: Rim Joist Insulation (Joist Sides Insulation)

Post by Shannon » Fri Nov 09, 2018 8:48 pm

These are not as straight forward as other areas. Fill the entire cavity with batt insulation as best as you can .
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DesignedtoRun
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Joined: Mon Jan 16, 2017 11:56 am
Location: Thunder Bay, ON

Re: Rim Joist Insulation (Joist Sides Insulation)

Post by DesignedtoRun » Mon Nov 12, 2018 7:59 am

I was thinking batt or perhaps Rockwool (Roxul) as I've seen you mention in the past. Then I'd assume I put some wood blocking in between the wood face above poured cement and the first joist? Someplace to affix the wall header? Would I cover this stuffed cavity with plastic or let it breathe?

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Shannon
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Re: Rim Joist Insulation (Joist Sides Insulation)

Post by Shannon » Mon Nov 12, 2018 7:21 pm

Yes use some short wood blocks between the joists. Attach the top wall plate to the blocks, after wall is insulated the poly air/vapour barrier will come up the wall and across the ceiling and get sealed to the bottom of that over head joist
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DesignedtoRun
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Re: Rim Joist Insulation (Joist Sides Insulation)

Post by DesignedtoRun » Thu Nov 15, 2018 12:24 pm

Thank you Shannon.

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