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Bifold Door Seal Replacement Due to their space-saving design and easy access, bifold doors are popular for hangars, garages and other industrial spaces. Keeping them sealed properly is crucial for energy efficiency, cleanliness and a comfortable indoor environment. Gaskets can become flat, shrink or even break over time. This causes water ingress and draughts, as well as heat loss. Fortunately, fixing this is simple and quick. on Top Rubber seals on bifold doors can be slackened or damaged