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Bifold Door Seal Replacement Due to their space-saving design and ease of access Bifold doors are a popular choice for hangars, garages and other industrial spaces. Maintaining them properly sealed is essential for energy efficiency, cleanliness and a comfortable indoor space. As time passes, gaskets become flat and shrink or are damaged, leading to draughts, water ingress and loss of heat. Thankfully, fixing this is easy and quick. Seals on the top The seals on bifold doors made of rubber can flatten out