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Bifold Door Seal Repair The bifold door is an excellent addition to any house However, it requires proper installation and maintenance to function properly. This includes a thorough integrity check, lubrication and a report of any issues to prevent them from happening in the future. To minimise sticking to prevent sticking, bifold doors are designed to be ever-so slightly smaller than the frame. Unfortunately, this also means air can enter through the gap. To fix this, install a wea