If your garage door has two springs pulling the door up then definitely have both replaced.
One garage door spring or two.
Garage door in many cases will dictate how many springs are needed for your garage door if the garage.
Some builders use only one spring when they install garage doors to save money but it may not be the best option for your particular door system.
Why we use oil tempered torsion springs.
Many garage door installers avoid using two torsion springs when they install a new door in order to save money at the time.
In most cases on double door 16 feet wide and larger we recommend replacing with a two spring system.
Doors with one spring place more pressure on the single spring than doors with two springs.
The cross section of the shaft is not circular one quarter of the shaft extends outward to form an edge.
Typically using a single spring instead of two will save just two or three dollars.
One spring systems utilize a larger spring that puts added stress on the other garage door system components.
The garage door has one or two springs nested inside of the shaft.
If your garage door was originally set up with only one torsion spring then you are perfectly fine with having only one spring put back on the door.
The second spring will break it s just a matter of time which is usually within 6 months.
The spring stays fastened inside the shaft by the stationary cone which matches the shape of the shaft.
Door is a single car door either 8 7 or 8 8 made of aluminum or other lightweight material then it will.
Added pressure and stress on the center bracket or center bearing can cause premature failure.
If you have very large heavy door then two or more springs will be required.