The Thermocraft Series garage doors are manufactured using the very latest in modern technology. Door sections are made up of a steel inner and outer skin. The space is then filled with liquid polyurethane foam for insulation and strength. This method is superior to polystyrene or styrofoam insulated doors as polyurethane has twice the R-value in the same thickness as styrofoam insulation and becomes very hard upon drying adding strength to the door sections. A full width rubber weatherseal eliminates air and wind infiltration between each door section. All these features add up to an energy efficient door that provides durability, strength, security and lasting beauty.