Re: Adding a panel to a garage door
It is possible, though not likely, that you can purchase an additional panel from the manufacturer of the door, or a door company who deals with this brand of door. The reason is that the height of each panel changes slightly depending on the opening height so that each panel is the same dimension and aesthetically pleasing. The overall dimension of the door must fit the opening or you start having clearance problems between the door, track, and structure.
Look for brand/model markings on and around the locks (inside and out ), or on the shoe rail or head rail. If you can't find any markings, it's possible that an experienced door company would recognize the brand if they were to see it.
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