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Bifold Door Seal Repair Bifold doors are a wonderful feature for any home, but they require proper installation and regular maintenance for proper operation. This includes a thorough inspection of the integrity along with lubrication and a detailed report of any issues to avoid them in the future. To minimise sticking, bifold doors are designed to be ever-so slightly smaller than the frame. However, this can lead to air leaking in through the gap. Install a weather seal to fix this problem. Damaged Seals Sea