Removing the Broken Window
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Back the screws out of the window frame. Select the appropriate drill bit, mount it to your cordless drill and set the drill to reverse. Unscrew all of the fasteners from the window.
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Pull the old window out of the window frame.
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Scrape away the old putty from around the window frame. Use a paint scraper to remove the old material.
Replacing the Window
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Run a strip of putty tape around the window frame. Use a utility knife to cut the putty tape to the proper length.
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Place the replacement window in the window frame. Press the window's nailing fin into the putty tape.
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Affix the window in place with the recommended screws. Fasten the window tightly over the putty tape to create a solid, weather-proof seal.