Your home deserves the best and you should use a certified Vinyl Siding Installer. VSI is a collaboration of vinyl siding manufacturer specifications for warranty correct vinyl siding installation. Once you’ve decided to side a home with vinyl siding, it’s important to know that the quality of the installation job is just as important as choosing a high quality product. VSI specifications and installation process are a direct correlation to ensure warranty coverage. Using trained, experienced, and certified professionals will help ensure that your home’s vinyl siding will look great and perform well for years to come.