i thought the foam on the outside was (apart from a smart way to hang the rebars) not keep the dome warm but to prevent either excessive cooling of the dome in cold weather or excessive heating in hot weather,in other words to keep the fluctuatutions in temp of dome shell within a small range, and to prevent damage to the dome surface itself
that said the dome, as a mass of concrete, is not easy to temp regulate and will tend to be a cold mass in winter and a warm mass in summer ,
this means that some other system other than the foam alone will be needed for temp regulation ;it also means that condensation will be a problem in cold weather with high humidity.
i would still like answers to the permeability of the airform while the concrete cures and answers on dealing with condensation as the dome is occupied, also some suggestions as to passive methods of dealing with the problem.
is one ( expensive) solution to have an inner dome of a lighter permeable material similar to foil backed plaster?
hoping for more suggestions,