I know it is recommended to pour the concrete / steel and insulating layer on the same day so they cure and bond together. What is the down side if you pour the insulating layer on a different day? I can't imagine that it would move being surrounded and loaded with brick. The reason I ask is that I am playing with the idea of having a different shaped form for the insulation layer than the supporting slab.
TIA,
Les...
TIA,
Les...
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