Rigid Foam, Sheathing, and Metal Siding
I read up on this but I didn’t find our exact scenario so I wanted to verify our thoughts here if possible.
We are in lower Michigan (zone 5) and have a 40x80x16 pole barn with uninsulated concrete floor, that is constructed with 6×6 treated posts. The outside wall currently consists of sheathing, house wrap, and metal siding over that. I was thinking of gluing or fastening rigid foam to the inside surface of the sheathing, then put up sheathing over the foam to protect it on the inside. Just to summarize, the layers from the outside in would be: metal siding, house wrap, sheathing, rigid foam, sheathing. The goal is to keep the temp inside the barn more consistent on very hot and cold days. No plans to heat it or anything.
Is there any issue with this, for example there may be a slight air gap between the outside sheathing and the rigid foam (any potential moisture/condensation issues)? My thought on doing this idea instead of closed cell spray foam is mainly cost but also I thought it may be a little cleaner and easier to work with.
Thank you very much , as always!
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