ThermoFormed meets the HUD criteria for grid-design equivalency.

"Originally developed in Europe (where concrete home building is standard), ICF systems have been used successfully around the world for more than 30 years. Thousands of ICF homes have been built in recent years throughout the United States and Canada. They have proven successful in every region and climate, from Orlando to Calgary. ICF systems are accepted by all the major model codes in the U.S., and by the R-2000 program in Canada."
     - Source: Insulating Concrete Form Association