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Bifold Door Seal Repair Bifold doors are a wonderful feature for any home, but they need regular maintenance and installation for proper operation. This includes a thorough examination of the door, lubrication, and an assessment of any issues that could arise in the near future. To reduce sticking to reduce sticking, bifold doors are made to be ever-so slightly smaller than the frame. This also means air can get in through the gaps. Install a weather seal to fix this problem. Damaged Seals Seals