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Bifold Door Seal Replacement Bifold doors are a popular choice for garages, hangars and other industrial spaces due to their efficient use of space and easy access. It is important to keep them sealed for energy efficiency, cleanliness and a comfortable space. Gaskets can flatten, shrink, or become damaged over time. This causes water ingress and draughts, and heat loss. Fortunately, fixing this is easy and quick. Seals on the top Over time, the rubber seals on a bifold will get damaged or flatten