Insulating a metal shop?

Mopar Momzee said

also closed cell spray foam is air tight it will seal your building like nothing else. Also it will have the building rock solid it’s like glue that holds everything together . I also laced my building in t-11 to give it more of a barn feel. Again worth the money to me. View attachment 1716335774View attachment 1716335773View attachment 1716335776View attachment 1716335775

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Bravo. Your shop is insanely nice! I can't even imagine what it would cost to spray foam that thing in 2024. I just got a quote for mine for 12k. Guys on youtube talking about 30-35k quotes on their 40x60s. Insane.

I think I'm going to try that 1.5" R-Tech foam board I posted in the original post. For whatever reason, 2" board costs nearly double what 1.5" does. I'm going to double up 1.5" and 1" because it's much cheaper. The company says it has about an 8-9 R-Value on the 1.5" board if you have an air gap between the foil and the wall. Add another R-4 for the extra 1" layer and that's about an R-12 or so. Hopefully that is tolerable during the summer.