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Find VSI Certified Siding Products

The VSI Product Certification Program is an independent, third-party certification program with an ISO/IEC 17065 accredited certification body in place.

Products undergo a series of rigorous tests and unannounced inspections by an independent, accredited quality agency. In addition, quality control procedures at each plant facility are continually reviewed for accuracy to ensure consistent production of certified profiles.

Certified vinyl siding is evaluated to ensure it complies with the ASTM D3679 product standard for:

• Weatherability, wind load, and impact resistance
• Expansion and shrinkage
• Surface distortion
• Length, width, and thickness
• Rate of burn
• Lead

Certified insulated vinyl siding is evaluated to ensure it complies with the ASTM D7793 product standard for:

• Weatherability, wind load, and impact resistance
• Expansion and shrinkage
• Thermal distortion
• Length, width, and thickness
• Rate of burn
• Lead
• Surface flame spread
• Compatibility of adhesives
• Thermal insulation value

Certified polypropylene siding is evaluated to ensure it complies with the ASTM D7254 product standard for:

• Weatherability, wind load, and impact resistance
• Surface flame spread
• Color
• Film adhesion

Certified products are authorized to utilize the Program’s certification mark. The mark represents that a manufacturer is producing a product that is a faithful representation of the tested and certified product in design, construction and fabrication.