Reply #6: Sounds good found this

[wakeme2008]

According to experiments, Grancrete is stronger than concrete, is fire resistant and can
withstand both tropical and sub-freezing temperatures, making it ideal for a broad range of
geographical locations. It insulates so well that it keeps dwellings in arid regions cool, and
those in frigid regions warm. Currently Grancrete is sprayed onto Styrofoam walls, to which it
adheres and dries. The Styrofoam remains in place as an effective insulator, although Dr. Wagh
suggests simpler walls, such as woven fiber mats, also work well and further reduce the raw
materials required.

at http://www.techtransfer.anl.gov/docs/Grancrete%20R&D100.pdf