PrimeSource Building Products is one of the largest distributors of building materials in the United States. The company offers Grip-Rite and Pro-Twist products. It operates more than 35 distribution centers throughout the U.S. and Canada. PrimeSource Building Products provides a variety of roofing, ceiling, metal and insulation products. The company offers a selection of exterior-coated nails and screws for outdoor applications. It provides ceiling products from Armstrong World Industries and United States Gypsum. PrimeSource Building Products offers blown, batt and roll fiberglass insulation, foundation sheathing and window wrapping services. The company also provides caulks, adhesives, roof coatings and sealants. PrimeSource Building Products maintains a distribution center in San Leandro, Calif.