Vinyl siding is the only exterior cladding with both third-party product certification and certified installer programs, both of which are administered by an independent agency. The Vinyl Siding Institute sponsors two different certification programs to ensure that vinyl siding products and colors meet or exeed ASTM quality standards and that vinyl siding installers demonstrate ASTM-accepted installation techniques. Click below to learn more.

The VSI Vinyl Siding Product Certification Program
Manufacturers certify with independent verification that their products meet or exceed industry standards for quality and color retention.

The VSI Certified Installer Program
VSI’s program ensures individuals are properly trained and companies are properly staffed and managed to install vinyl siding (as well as soffit and accessories) consistent with the ASTM D4756 standard.