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Bifold Door Seal Repair The bifold door is a great addition to any home, but it requires proper installation and maintenance in order to function correctly. This includes a thorough inspection of the integrity, lubrication and a review of any issues to prevent them from occurring in the 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