The other thing I think that is often overlooked on SIPS enclosed frames is the shear number of screws there are holding the frame to sill and screwed to the posts...especially the corners...
I've had that same conversation with several engineers. If they can make a whole house out of sips alone, and the way sips are anchored to the deck/foundation is adequate, doesn't screwing 20,000 lbs of timber to the inside make uplift even less of a problem? So why do we need additional anchors?
