Can you use Rockwool mineral wool as skirt insulation on a slab on grade?

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Can you use Comfortboard mineral wool insulation as a skirt on monolithic slab?

Eric Sokol Oct. 16, 2021

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!

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