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Bifold Door Seal Repair Bifold doors are a great feature for any home, but they need regular maintenance and proper installation for proper operation. This includes a thorough inspection, lubrication, and an assessment of any issues that may occur in the near future. To reduce sticking to reduce sticking, bifold doors are made to be ever-so slightly smaller than the frame. Unfortunately, this can also cause air to leak in through the gap. To stop this, you can install a weather seal.