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Bifold Door Seal Replacement Due to their compact design and ease of access bifold doors are popular for hangars, garages, and other industrial spaces. Keeping them sealed properly is vital to ensure energy efficiency and hygiene, as well as a pleasant indoor environment. Gaskets can shrink, flatten or even break over time. This can cause water ingress and draughts as well as heat loss. This is a simple and quick fix. Seals on the top As time passes, the rubber seals on a bifold will