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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. Making sure they are sealed properly is essential for energy efficiency, cleanliness and a comfortable indoor space. Over time gaskets flatten and shrink or are damaged, leading to draughts, water ingress and heat loss. This is a quick and simple fix. Seals on the top As time passes, the rubber seals on a bifold will be damaged or flatten