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Find VSI Certified Siding Products

Through the VSI Product Certification Program, manufacturers can verify that their products meet or exceed the industry standards for performance. Certified product packaging must include the VSI Program Label.

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

Vinyl siding certified through the VSI program is evaluated to ensure it complies with the ASTM D3679 standard for:

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

Insulated vinyl siding certified through the VSI program is evaluated to ensure it complies with the ASTM D7793 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

Polypropylene siding certified through the VSI program is evaluated to ensure it complies with the ASTM D7254 standard for:

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