Can you use Rockwool mineral wool as skirt insulation on a slab on grade?
I am building a small structure on a monolithic slab and trying to reduce the amount of foam in the assembly. I'm wondering if I could use comfortboard sheets as my horizontal frost protection skirting on the outside of the slab? It is an 18x16 slab, on a very well drained crushed stone pad. Roxul tech support was not very helpful with this question (she seemed unfamiliar with the detail), so I am wondering if anyone has had experience with this? Thank you!