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Bifold Door Seal Replacement Bifold doors are a popular option for garages, hangars and other industrial spaces because of their efficient use of space and easy access. Maintaining them properly sealed is essential for energy efficiency, cleanliness and a comfortable indoor space. Gaskets can shrink, flatten or even break over time. This can cause water ingress and draughts, as well as heat loss. This is a quick and simple fix. Seals on the Top Bifold doors with rubber seals can flatten out or