1799 Special Trade Contractors, Not Elsewhere Classified Establishments classified in this industry are primarily engaged in construction work that could not be classified in another specific industry. This industry includes establishments engaged in construction of swimming pools and fences; erection and installation of ornamental metal work; house moving; shoring work; waterproofing, dampproofing, fireproofing; sandblasting and steam cleaning of building exteriors; asbestos and lead paint removal; and modular furniture attachment.