GreenBlock is a manufacture of insulated concrete forms. The business started in the 1960's, and came to America in the 80's. The concrete forms can be pieced together, and interlaced with Rebar. The forms are then filled in with concrete. Because of the concrete, as well as the polystyrene, the forms are very insulated, and have a very high R-value. The product is composed of 40-50% recycled material. The foam itself is 100% recyclable. The product is manufactured in Idaho and Colorado. It can be purchaed locally at Greenblock.com, as well as through their 800 number.
GreenBlock