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Bifold Door Seal Replacement Due to their space-saving design and quick access bifold doors are popular for hangars, garages and other industrial spaces. Keeping them sealed properly is vital for energy efficiency and cleanliness, as well as a comfortable indoor space. As time passes, gaskets begin to flatten and shrink, or become damaged, which can cause draughts, water ingress and loss of heat. This is a simple and quick fix. Seals on the top Bifold doors with rubber seals can be slackened or damaged over