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Condensation In Wall Cavity

 
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Old 07-27-2019, 11:57 PM   #1
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Condensation In Wall Cavity


Iíve been doing a lot of reading about the best way to insulate walls. In my case Minnesota, climate zone 6.

It looks like the experts are for insulating walls from the exterior to prevent condensation. But...

most builders arenít doing that. Itís still youíre typical wall. 2x6, osb sheathing, batt insulation in cavities, vapor barrier on warm side and drywall.

So what gives? If building science is making this claim about insulating on the outside to prevent condensation then why hasnít code changed and why arenít builders building this way and why havenít I seen a real world cavity condensation problem?

I should mention MN code does require exterior insulation for basement foundation walls.


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Old 07-28-2019, 12:18 AM   #2
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Re: Condensation In Wall Cavity


Quote:
Originally Posted by JRremodelers View Post

So what gives? If building science is making this claim about insulating on the outside to prevent condensation then why hasnít code changed and why arenít builders building this way and why havenít I seen a real world cavity condensation problem?

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You have never dealt with rot in a wall cavity?

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Old 07-28-2019, 12:20 AM   #3
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Re: Condensation In Wall Cavity


I have, not from condensation but from other sources.




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Old 07-28-2019, 08:50 AM   #4
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Re: Condensation In Wall Cavity


Where did you read that "insulating from exterior" thing? Just one mans opinion maybe.
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Old 07-28-2019, 08:57 AM   #5
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Re: Condensation In Wall Cavity


If you haven't seen cavity condensation problems, someone detailed the envelope well. I've seen condensation problems both in heating climates and cooling climates.

Wall insulation systems are driven by energy code. If there inky one way to achieve the desired r value, houses would only be built one way
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