An overhead garage door opens either manually or by a garage door opener. These type of doors are frequently large enough to accommodate cars and other vehicles. A typical overhead garage door used in the past would have been built as a one-piece panel. However, nowadays, newer versions are now generally built from several panels hinged together that roll along a system of tracks guided by rollers.
So how are overhead garage doors operated? There is a spring-loaded or counterbalanced mechanism to offset the weight of the door. The weight of the door may be 400 pounds or more, but is balanced by either a torsion spring system or a pair of extension springs.
Doors can be made of wood, metal, fiberglass, etc. and may be insulated to prevent heat loss. Residential attached garages, where the insulating value and the energy efficiency of a garage door is important to prevent overheating and freezing problems, also provide the benefits of comfort and energy savings.
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