Re: Expanding Foam as Insulation
Is this outdoors? If so, an air gap would be great for stopping rot in the floor.
Cans of SEF don't go as far and therefore become very expensive very quickly. You can buy rockwool slabs, but it would have to be laid between load-supporting joists that a second floor would be laid upon (polystyrene would be too much of a fire hazard AFAIC).
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