The fiberglass garage doors come with a composite build with a steel core that hides the fibeglass exterior. Some of them are also provided with a polyurethane insulation to achieve a higher level of energy efficiency with improved insulation. Despite these advantages of a fiberglass garage door, wood garage doors are still quite popular, the major reason being their unmatched good looks. Though wood garage doors are also a good choice from the point of view of environment sustenance and energy efficiency, they are considered a bad choice from the perspective of maintenance.