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About This Document: In 1998, VSI launched the VSI Product Certification Program for manufacturers to independently verify the quality of the vinyl siding they produce. As the program grew, polypropylene siding certification was added. Both are verified by an independent quality-control agency to meet or exceed the relevant ASTM standards. Additionally, the VSI Product Certification Program includes color-retention certification for vinyl siding. More than 950 products and 300 colors are certified through VSI's program.

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Vinyl Siding Quality Control

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Vinyl Siding Quality Control

Exterior Contractor: Certification

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