just starting to design house,would this work for deck/roof? stack icf walls,build i-joist roof,deck with pressure treated plywood. install metal brackets on i-joists ends that project into the icf core.(when the walls are poured this will capture the metal brackets from the i-joists) under standing that of coruse the under side of deck is fully shored up as per enginer specs. as the walls are poured from the deck (no scaffold needed) complete the wall pour then pour the deck starting in center working out to walls with 3 inch deck slab rebar and fiber mesh,and this waterproofing additive called kalmatron. the deck rebar ties into the wall pour. icf wall is braced inside with steel c-channel same as the scaffold would have done. any one tried it this way? also need i-joist sizing , 16 o.c. x 22' span to carry 100lb. per sf. load? sorry have just moved and my office is still packed . can,t find load, span info.(dead load is about 30 lb. sf.) this would be for costing of i-joists. the engineer will final the size of joists. thanks.

http://www.polysteelsales.com/dietrich.htm

I built a safe room that way once, and have done several other monolithic pours similiar but not as high off the ground. It sounds like you have a good idea, just make sure you have easy access to your bracing to keep everything plumb, I would recomend bracing from the outside if possible. One thing you might want to check is that the engineer and inspector are ok with it. I don't know where you live, but we had a problem doing a monolithic pour with a inspector in Los Angeles. Question. Why are you starting your deck pour in the middle? Is it to give the walls more time to cure before you are working right on top of them?

arommac ,yep to give walls time to cure some. screed it, float it ,back off. then when its ready to power trowel it should be set enough at the icf,s  to not disturb the joist connectors .