Steel framing systems are conducive to prefabrication at or away from the job site. Quite often, exterior curtainwalls are partially or entirely prefinished. Quality is improved due to the controlled work environment of the fabrication shop, while its efficiency of construction may result in earlier building enclosure and ultimate occupancy. In a similar manner, load-bearing walls, platforms, and trusses may be prefabricated to the close tolerances required of these systems. Steel framing will not shrink or crack. It does not rot and is impenetrable to termites, vermin, and insects. Factory-punched holes permit easier installation of pipe, cable, telephone, and electrical services.