Perma form use Insulated concrete forms for construction. These forms are highly energy efficient in nature. Buildings constructed with these forms are Wind resistant in nature. CF walls have been proven to withstand flying debris from tornadoes and hurricanes with wind speeds up to 250 mph. http://fireresistanthouse.blogspot.in/2014/06/normal-0-false-false-false-en-us-x-none.html
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