LP is a premier supplier of building products, manufacturing innovative, high-quality commodity and specialty products to retails, wholesale, homebuilding and industrial customers. LP is the world’s largest producer of OSB, and also manufactures engineered wood products, siding, and molding.

The Vinyl Siding Institute, Inc. is the trade association for manufacturers of vinyl and other polymeric siding and suppliers to the industry. Through initiatives such as the VSI Vinyl Siding Product Certification Program and the VSI Certified Installer Program, we strive to improve the quality of today’s vinyl siding and to educate on the many benefits that have made it the number one choice of exterior cladding across the country.