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I just picked up some polyiso and have some concerns. To my surprise it was faced not with foil, but with a fiberglass paper. Polyiso is very hard to find in the area right now, and this was a delivery from Salt Lake, very good price. I decided to take it, head home and do some reading.
Apparently, it's an ideal product for roofing due to its rigidity. But, it's faced in a surface not friendly to moisture and will inhibit mold (obviously). Has anyone used this with success?
I really don't want to do a vapor barrier in this project out of sheathing as I've done it before and didn't enjoy the work. I also question its effectiveness in a van. I'm thinking I screwed up and this is something I should avoid. My only other thought is to paint the polyiso with something like Sherwin Williams Moisture Barrier paint, that allows less than 1 perm...
Ugh.
Edit: Or, I salvage what I can and do an outer layer of 1/2" foil faced EPS, with great stuff in the gaps...
Apparently, it's an ideal product for roofing due to its rigidity. But, it's faced in a surface not friendly to moisture and will inhibit mold (obviously). Has anyone used this with success?
I really don't want to do a vapor barrier in this project out of sheathing as I've done it before and didn't enjoy the work. I also question its effectiveness in a van. I'm thinking I screwed up and this is something I should avoid. My only other thought is to paint the polyiso with something like Sherwin Williams Moisture Barrier paint, that allows less than 1 perm...
Ugh.
Edit: Or, I salvage what I can and do an outer layer of 1/2" foil faced EPS, with great stuff in the gaps...