From: ElfNori <elf@elfnori.com>
>Don't agree . . . air infiltration is the thing that will suck your heat or cool and >that's the entire point of the article.
I realize this is anecdotal, but I saw a nice example of this effect last week. I have an instant read thermometer and was measuring some surfaces around my house on a cold day.
There is a temporary wall between the main part of the house and the unfinished addition. This wall is insulated with 2" XPS (pink foam) and has a removable section for access to the addition. The removable panel does not seal real tightly, so there's air infiltration around it's perimeter.
I think it was about 20 degrees in addition. I pointed the thermometer at the XPS foam and it read 66 degrees, that's about what the rest of the house (drywall interior walls) was too. I shot one of the 2x4 studs in that temporary wall to see how much thermal bridging effect was happening. It read about 60, a significant difference, but not dramatic. I shot the studs where the removable panel fits in...41. The gap is maybe 1/16 inch, so it's not huge but it made a big difference in the localized temperature.
Greg
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