After strongly considering OP-Deck because of its ability to span 20 foot spans without support, I have decided to stick with the Insul-Deck. I received a sample piece of Op-Deck. It has foam sandwiched between metal panels and the 1' x 4' sample is heavy. Although it can span greater unsupported spans, it presents a whole new set of issues. The weight of a 5' x 20'+ panel is close to 300 lbs. Also, I am building right on the ocean and the exposed steel is an issue. I may consider this product for other projects, but for this current project I feel the Insul-Deck is the better choice.
As far how to use the Insul-Deck for your application, the thickness of the insul-deck, amount and size of steel and how it is attached depends on your particular project. All of this needs to be designed by a structural engineer. We design all of our ICF buildings in-house. You would need to locate a local firm with knowledge of ICF. If I knew your spans and type of outer and intermediate bearing, I could give you an idea of the thickness of the Insul-Deck and the amount and size of the steel rebar. This would be for informational purposes only and in no way firm design criteria.
J C Marshall Construction Inc.
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