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Bifold Door Seal Repair Bifold doors make a fantastic feature for any home, but they need regular maintenance and proper installation to ensure proper operation. This includes a thorough integrity check, lubrication and a report of any problems to prevent them from occurring in the future. Bifold doors are designed slightly smaller than their frames to minimize sticking. However, this could result in air leakage through the gap. To fix this, install a weather seal. Damaged Seals A bifold door's abili