Common lift for residential projects. In this case, 8 ½ inches are needed for ceiling headroom with extension springs (installed over the two horizontal tracks). With torsion springs, 12 inches are needed (over the garage door header).
If there is an electric door opener, 2 extra inches must be added. If the door is higher than the opening, the ceiling headroom must be measured from the top of the door.
Torsion springs are the most popular and are recommended.
Low front headroom
Required when there isn’t enough space for a standard lift.
This means the space over the door is less than 8 ½ inches for extension spring applications and less than 10 inches for torsion spring applications.
Used when the garage door system must follow the slope of the roof.
Full vertical lift
Frequent lift for commercial projects. Used when the door opens vertically along the wall above it.
In this case, the required headroom is the same as the height of the door. (Think of a loading dock door).
Low headroom rear
Required when there isn’t enough space for a low front headroom.
This means the space over the door is less than 8 inches for torsion spring applications.