I just bought a lot of used old foam board that was common years ago. It has a black felt-like paper coating on both sides and is a mustard colour foam. I was wondering if this stuff off-gasses formaldehyde in a worrisome amount. Mostly, I will be using it to insulate a pump house and greenhouse and RV skirting. But I may want to use some in the house But won't if formaldehyde is a problem with this stuff.
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- Old foam board and formaldehyde