Polarwall is the innovative method of construction for the 21st Century that gives to architects, builders, and home owners, performance levels that are just not achievable with any other method of construction. Polarwall is a permanent shuttering composed of polystyrene insulation boards held in place by a series of plastic rails and crossties. Concrete is poured into the formwork, and cures in ideal conditions. The formwork stays in place after the concrete has cured to provide insulation to the wall. The resulting wall attains levels of thermal efficiency, acoustic resistance and structural strength unmatched in any other building system. Polarwall has residential and commercial applications. The build speed is fast and does not need high levels of expertise. It is ideal for basements as well as above ground construction, and there are no height limits to the construction.