A cross section diagram of a window installation
Once your new window is installed, it should be square, level and plumb.

Installing new windows is a great way to save energy and money, but only if the job is done correctly. Here are some of the steps your contractor will be following to replace them.

Before any work has begun, your installer will verify all window measurements and remove any facings or mouldings that will be reinstalled after the work has been completed. After your old window has been removed, your installer will inspect the rough opening to make sure all materials and wall pieces are in good condition. At this stage, necessary repairs will be made to ensure that your window will be completely airtight and watertight. After the opening has been cleaned and repaired, your new window will be positioned with shims to ensure the window is square, level and plumb. It will then be secured permanently to the frame with screws. Following the installation, your window will be insulated. Make sure you discuss insulation options with your contractor prior to replacing your windows. Finally, your window will be caulked to ensure water tightness between the window frame and the exterior siding and new or the original mouldings will be replaced on the interior of your home. Once the installation is complete, the contractor will inspect it with you for your approval. At the same time, they will explain how the window operates, go over warranty coverage and give advice on how to maintain the product.

FAQ Friday is a weekly feature where we answer Frequently Asked Questions about our products, service or industry. To see other FAQs we’ve answered, visit our FAQ page. If you have a question you don’t see an answer for, just ask in a comment or contact us.

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