Certified Polypropylene Siding
Authentically replicating classic home exterior shapes and textures, polypropylene siding is a low maintenance cladding option that adds value to a home's exterior. In addition to these qualities, polypropylene siding certified through the VSI Product Certification Program is independently verified to meet or exceed the industry standard for performance.

Through the VSI Product Certification Program, polypropylene siding manufacturers can certify with verification by an accredited quality control agency that their products meet or exceed the ASTM D7254, the Standard Specification for Polypropylene (PP) Siding. Sponsored by VSI , the Program has more than a decade of experience certifying polymeric siding to ASTM standards.

Once siding has been certified through this Program it is included in VSIís Official List of Certified Products.