GTS Interior Supply is a full-service distributor of commercial and residential interior finishing products. The company operates more than 20 sales locations in Washington, Oregon, Idaho, Montana and Alaska. Founded in 1979, it delivers a range of regular, ceiling, water-resistant, plaster veneer, sound and raised panel specialty gypsum wallboards. GTS Interior Supply s range of acoustical products includes sound isolation membranes, wood and metal ceilings, tectum wall and ceiling panels, and wall and corner protection systems. The company provides a variety of fasteners and adhesives, such as drywall nails and screws, sound caulk and backing clips. With a location in Kirkland, Wash., it is a part of Gypsum Management & Supply.