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Question DetailsAsked on 6/20/2017

My garage door has one torsion spring on it. It is heavy to lift manually.

I want to replace it with two springs left and right wounded. Would I use the same measurements as the one already in place.

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1 Answer


A normal rollup door, with a central bearing hub on a shaft that goes full width of the door to brackets with bearings at each end, should have a matched set of springs - not just one unless the door is unusually light - and certainly if more than a one-car door. The springs come in various diameters and torsion ranges (in about 20# increments), and also different design cycles.

Two springs are safer than one because with just one spring, if it breaks the door can free-fall - damaging it and a real danger to anyone under it (which is why one should never pass under a garage door whnile it is opening or closing).

In your case, it may be the spring just needs adjusting for more torque (they lose their strength through use) - or if torqued as much as it will take or broken, then while replacing it (if your door can handle two springs) adding a second one at the same time will likely be about $50-75 additional cost over just doing one.

The right choice of springs depends on the door weight - the right load range spring has to be used, then they are equally torqued till they carry all but about 10# of the door weight.

The life cycle you buy depends on your use - a standard spring used to be rated for 10,000 cycles (an open and close cycle) but some cheap ones are now rated for 7,000-8000 cycles - about 6-10 years with 2-3 uses per day. If you use your garage door a lot you might want to go with a longer life spring like 15,000 or 20,000 cycles - longer life cycle doesnot cost a great deal more.

Typical garage door issues and ballpark costs for spring replacement can be found in the Home > Garage link under Browse Projects, at lower left. Note almost all the pricing deals with a pair of springs - so if you only need one replaced your cost would be expected to be a bit less, by maybe $50-75.

Garage Doors is of course the Search the List cateogry for well-rated and reviewed vendors for this work.

Answered 3 years ago by LCD

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