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Bifold Door Seal Repair The bifold door can be a wonderful addition to any home However, it requires proper installation and maintenance to function correctly. This includes a thorough examination of the lubrication system, as well as an assessment of any issues that might arise in the future. To minimise sticking to reduce sticking, bifold doors are made to be ever-so slightly smaller than the frame. This also means air can leak in through the gap. To fix this, install a weather seal. Seals that are damaged