Dealers Service & Supply Co. has been serving the Bi-State Areas of Missouri and Illinois since 1942. Based in Kirkwood, Mo., it is one of the best suppliers of exterior building materials to builders, contractors and homeowners. The firm's product offering, includes laminated asphalt, metal, composite slate and commercial roofing material. In addition, Dealers Service & Supply Co. provides a range of vinyl and fiber cement sidings as well as window and door products. The company offers product brands, such as CertainTeed, Tamko, WeatherBond, Exterior Portfolio and JamesHardie.