For an 8 foot high door the spring would be 28 inches long with a 48 inch stretch.
Type of garage door spring from weight of the door.
Typically a garage door has two extension springs with each of them placed on either door side and running parallel to the horizontal track.
They twist slowly and wrap around the shaft as the door lifts.
Similar to the above option.
Once you know the total weight of your garage door using a bathroom scale for doors under 300 pounds you can use the chart below to see the color extension spring you need.
Lighter garage doors can do with one but heavier ones need two torsion springs.
These are light weight long springs that run perpendicular to the garage door.
Now on to the different types of torsion springs.
The standard option is pretty common and are mounted above the garage door opening.
Torsion springs are located over the garage door and the number of springs depends on the size and weight of the door.
Extension springs are located on each side of the door near the upper rails there should always be two extension springs and cables.
The energy wound in the torsion springs is what actually lifts the door.
When the garage door is closed more weight pan out the horizontal track adding tension to the stretched extension springs.
In order to open the door these springs extend providing counterbalancing force to support the door.
When a garage door needs to open the opener guides the door along the tracks.
They are usually mounted above the door tracks horizontal portions.
Torsion springs act as counterweights to the weight of the garage door.
Garage door spring weight chart posted on september 21 2019 by bandi ruma garage door torsion spring replacement our torsion springs vs the peion estimate door weight counterweight jpg upgrade from two to four torsion spring standard garage door torsion springs.
Each of these springs provides independent tension.
Torsion springs extension springs and other garage door components can cause serious injury or death if not handled properly.
They support the efforts of the garage door opener by doing the heavy lifting.
Usually located above the upper horizontal tracks on both sides of the door extension springs are the most common residential garage door spring type.
They are usually mounted above the door tracks horizontal portions.
You can give your newly taken spring measurements to a puls technician and let them take your garage door spring repair from there or you can just let them take care of your repair start to finish including measuring your garage door springs.
Let the door down slowly and record the weight.