The structure was framed with 2x6 walls so that more insulation could be installed. The attic was framed with storage trusses so that the attic space was mostly useable. All sub flooring, wall sheathing and roof sheathing was by Advantec, a company that has a 50 year warranty on there products. We used spray foam insulation thru-out, even in the attic for its superior insulating and sealing abilities. Hardi Siding was used for its beauty and its low maintenance. Windows by Marvin are made with fiberglass for strength and low maintenance. To complete the energy efficiency package we installed a Geo-Thermal heating system that uses the earth as its energy source. This is a very efficient system. The home owner reports sub $100 utility bills, we were impressed.