This extra tension keeps the door open by restricting the curtain from unrolling off the drums.
Garage rool up door torsion spring.
If the garage door has two springs measure each spring individually.
Some smaller self storage roll up doors use only one torsion spring while most larger doors use two torsion springs.
The garage door torsion spring is located above the garage door while considering rear torsion applications it s located behind the door.
While garage door torsion springs can handle weights of up to 800 lbs.
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Use this method if the door worked correctly before the spring s broke and the garage door has not been tampered with.
It is not uncommon to have two different size springs.