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Bifold Door Seal Repair The bifold door is an excellent addition to any house however, it needs proper installation and maintenance to work correctly. This includes a thorough inspection of the integrity, lubrication and a report of any problems 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 also means air can enter through the gaps. Install a weather seal to stop this issue. Damaged