Michael,
Polycore Canada Inc produces a type of metal SIP; the only difference is that our steel is embedded in the EPS as opposed to sheeted on the inside/outside. Our company has done extensive testing over the past 6 years and has modified our system to maximize thermal efficiencies and reduce all thermal bridging. We have completed over 600 projects and have not had any issues with any of them to date. All of our projects are structurally engineered, and come complete with engineered stamped drawings. These drawing are sufficient for all building inspectors and insurance and warranty companies. If your company does not have a full time Engineer on staff, I would recommend that you hire one.
I would be very interested in finding out more information about your system. Do you have a website? Feel free to contact me directly, all my contact info is listed on our webpage.
Cheers,
Lance