The number of sections ranges from 3 to 7 or more depending on
the style and height of the door.
The Residential
Garage Door usually has 4 sections up to 7' high and 5 sections up to 8' high. A typical 1-car garage door is normally
8'-9' wide and a 2-Car door from 15'-18' wide with 16' being the most common.
The Door is lifted by a counterbalance spring system, which can either be a Torsion system as shown in the diagram,
or an Extension system where the springs stretch out along the Horizontal tracks on either side of the door. The Extension
system is typically used where the headroom is too low to accomodate the Torsion system.
Garage Door Springs
can cause Serious injury and should only be serviced by a Professional Technician.