Weber Lumber stocks the Therma-Tru Construction Series steel door system. With a 25-gauge, insulated steel door and a multitude of options in inserts available, this door system provides the builder with a quality door and a recognized name at a competitive price. For a steel door look with the fiberglass advantage (along with all of the insert options of steel), we also stock the Smoothstar fiberglass door from Therma-Tru.