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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. Making sure they are sealed properly is essential to ensure energy efficiency, cleanliness and a comfortable indoor space. Gaskets can shrink, flatten, or become damaged over time. This can cause draughts and water ingress, and heat loss. This is a simple and quick fix. Seals on the Top The seals on bifold doors made of rubber can become flat or damaged over time. This can cause draughts and heat loss, as well