All Guardian Steel Doors are manufactured with a two piece unitized steel construction for durability and strength. The heavy 22 gauge hot dipped galvanized steel is 50% thicker than a standard steel door found at many home centers.
They are also fully insulated with an inner core of polyurethane foam for an R-value of 13.0, more than four times that of a wooden door! A foam filled interlock provides for a thermal break.
The Steel Advantage: All Guardian steel doors feature an all steel edge construction, which means there are no wood edges that can be cracked when force is applied. This gives you the best security rating in the industry.