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>Have / would any of you specify a structural solution based on new
>technology if it has been proven and documented elsewhwere but does not
>yet have an ICBO ER Number?

Yes, and the UBC provides that such solutions may be accepted by the
building official. As usual, one should exercise due care twice over in
specifying new technology. 

Even when an item does have an ICBO ER approval, one should not specify it
mindlessly on blind faith in the ER process.

Charles O. Greenlaw SE   Sacramento CA