SIG plc engages in the distribution and merchanting of specialist insulation and building products for the construction and related markets in the United Kingdom, Germany, France, Benelux, Poland, Ireland, and Mainland Europe. It offers insulation and interiors products, such as structural and technical insulations, dry linings, construction accessories and fixings, cladding and façade systems, ceiling tiles and grids, partition walls and door sets, and floor coverings. The company also provides roofing and exterior products, including tiles, slates, membranes, and battens for pitched roofs; single-ply flat roofing systems; industrial roofing and cladding systems; and room-in-roof panel systems, as well as industrial painting, coating, and repair services. It operates 426 trading sites. The company serves developers, contractors, specialist installers, and independent merchants. SIG plc was formerly known as Sheffield Insulations Limited. The company was founded in 1957 and is headquartered in Sheffield, the United Kingdom.