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Bi Folding Door Repair Tips Bi-fold doors are a great option to connect your indoors with the outdoors. They are great to let the sun and fresh air in, but they must be maintained properly to prevent damage. There are a variety of common issues you might have to deal with when using your bi folding door. Fortunately, they are simple to fix. If you've recently added carpeting or changed flooring material in your home, you could notice that your bi folding doors scrape at the bottom. This is a simple fix. The