This article explains in detail how an East Coast builder formed and poured walls and a structural garage slab using insulating concrete forms (ICFs) for the walls and polystyrene deck forms. He writes:

Pouring a heavy concrete slab over fluffy-looking EPS (expanded polystyrene) form panels may seem like taking the ICF concept a step too far. Actually, the Reddi-Deck system offers some advantages over precast concrete panels and conventional cast-in-place floor methods.

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