SIG plc is a British-based international supplier of insulation, roofing, commercial interiors and specialist construction products.

[3] The company was first listed on the London Stock Exchange in 1989, when it became Sheffield Insulations Group plc.

[2] The company expanded rapidly in the start of the 1990s, acquiring Ceilings Distribution Ltd, a supplier in the United Kingdom of ceilings products, in 1990, Freeman Group, a large British insulation distributor, and Isokauf in Germany in 1994 and Komfort Systems, a supplier of partition systems for offices, in 1995.

[2] In 2004, the company bought Orion Trent Insulation, another distributor for the United Kingdom,[4] with Leaderflush Shapland (formerly LS Group), a manufacturer of door sets for hospitals following in 2005.

[14] The company serves a wide range of markets across the building, construction, off site manufacturing and process sectors, from premises throughout Europe and the Middle East.