I am blowing 6 in of foam from the outside and then I will put the tin on the outside. I was told it would be better to spray the foam on the tin that way there wouldn't be any air pockets for condinsation to build.
I would put 2x6 down on floor of cooler and insulate with foam, cover with solid decking then frb, you will get lots of moisture from slab into cooler and it will clean up easier. To seal slab you need a 2 part epoxy, but it will be slippery when wet.
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