Our site offers many resources to help troubleshoot common window and door issues. Please visit our how to videos for quick tips and parts installation. If you need further assistance please submit a warranty request using the online Cornerstone Building Brands warranty request form. To help prevent any additional delays, please include a photo of your window or door label with the order number and a detailed explanation of your issue. When you click on the button below you will be taken directly to the Cornerstone Building Brands Warranty Request form where you’ll be able to submit your request.