https://longshots.wiki/wiki/Th....e_Top_Replace_Bifold
Bifold Door Seal Replacement Due to their space-saving design and easy access bifold doors are popular for hangars, garages and other industrial spaces. It is important to keep them sealed to ensure energy efficiency, cleanliness, and a relaxing atmosphere. Gaskets can flatten, shrink or break down over time. This causes water ingress and draughts and heat loss. This is a simple and quick fix. Seals on the top Rubber seals on bifold doors can become flat or damaged over time. This can lead to draughts, heat loss