Insulation below slab / Discussions

...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 u...

We are converting a garage into a living space (a bedroom) and it currently has bare concrete with a smattering of carpet that looks like it has gone mouldy. What product would you recommend to create a subfloor to stop moisture seeping up from the concrete floor and to insulate to stop cold ingress. The product I have...