Sterling is the nation's leading site access contractor and manufacturer, providing services and products that support building and maintaining our nation’s energy infrastructure. From initial site planning through final restoration, Sterling provides a complete suite of site access products and expert services for projects of all sizes and scopes. As America’s largest manufacturer of CLT (cross-laminated timber) site access mats, our TerraLam® CLT is an engineered matting solution that saves time and money, protects the environment, and supports worker safety. Our site access expertise combined with our innovative matting products deliver exceptional value and lay the groundwork for your success. Headquarters: 501 E. 151st Street Phoenix, Illinois 60426 708.388.2223