Basement wall insulation

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Stoney
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Joined: Fri Jan 10, 2020 4:28 pm

Basement wall insulation

Post by Stoney » Fri Jan 10, 2020 5:01 pm

Hi Shannon, we have an area of our basement that isn't finished and used as a workroom, it is always a cold area and our kitchen is right above it making that floor/room cooler as well. The basement walls are about 8' high cement block with the top 3' being above grade. It is currently insulated with 1.5" ridgid foam between ripped 2x4 framing. The ridgid foam is basically just squeezed in there with no attachment to the cement blocks. I'm wondering what the best method would be to insulate this room better? Using what we have and adding to it? Or different method all together? I've attached a couple of photos for reference.
Thanks in advance
Shawn
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Shannon
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Location: Canada

Re: Basement wall insulation

Post by Shannon » Fri Jan 10, 2020 10:43 pm

Well the foam is a good start but there is all kinds of R value issues with this wall. The cold transfers so much easier through the 2xs when attached right to the cold wall and nothing to stop air flow is an issue as well.
Personally I would remove it everything and start over. Reuse the foam And cover the entire wall then frame a wall in front of it and insulate and vapour barrier followed with drywall. This includes insulating and sealing the drafty rum joist ends also.
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osage
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Joined: Sun Jan 12, 2020 11:37 am

Re: Basement wall insulation

Post by osage » Sun Jan 12, 2020 12:36 pm

Shannon, This is probably a less than intelligent question but, why wouldn't it be effective to insulate by foam sealing the gaps on the sides of the vertical 2X4's as well as the joining at the top and bottom. Additionally, to prevent cold transfer thru the 2X4's why not spray the 2X4's with foam?

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A. Spruce
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Re: Basement wall insulation

Post by A. Spruce » Sun Jan 12, 2020 6:45 pm

osage wrote:
Sun Jan 12, 2020 12:36 pm
why not spray the 2X4's with foam?
Expense.
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Shannon
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Re: Basement wall insulation

Post by Shannon » Sun Jan 12, 2020 7:50 pm

You absolutely could but the expense is high and you will still have to frame another wall in front of it to run electrical and attach drywall.
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