The largest SIPs manufacturer in North America, Premier Building Systems is a division of Insulfoam LLC, the largest EPS foam manufacturer and fabricator in North America. Both Insulfoam LLC and Premier Building Systems a......The largest SIPs manufacturer in North America, Premier Building Systems is a division of Insulfoam LLC, the largest EPS foam manufacturer and fabricator in North America. Both Insulfoam LLC and Premier Building Systems are owned by Carlisle Construction Materials, one of the largest construction material corporations in the country. Premier has a strong presence in the Structural Insulated Panels industry with more dedicated sales representatives, project managers, and distributors located throughout North America than any other SIPs manufacturer, focused on helping others experience the benefits of Advanced Building Techniques.