Pouring a Concrete Slab Over Rigid Foam Insulation
Asking for a friend (really!) who’s installing a stego vapor barrier under his slab. The plan was to put the neopor graphite polystyrene insulation on top of the vapor barrier, then pour.
He’s using that method at the suggestion of a builder he’s consulting. Now it’s time to lay down the barrier and pour in a couple days, but the concrete people are nervous/unhappy about having the insulation on top of the vapor barrier. From what I understand they’re unsure about the stability of it/the possibility that it will shift around and cause issues.
Any advice on how to proceed will be much appreciated
We’re in climate zone 5A—coastal NH.
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