Garage Door Extension Springs
Extension springs for use on garage doors are typically selected according to the height of the garage door. An extension spring for a door that is 7.5 feet tall should probably not be used for a 9 foot door. An extension spring used on a door that is too tall must stretch too far. This may result in several problems, including a dramatically shorter number of open and closing cycles the springs can handle. Extension springs at their fullest extent are typically half the height of the door.
Another consideration for installing new extension garage door springs is the weight of the garage door. The pulley system that compatible garage doors operate under mean that extensions springs must only pull half the total weight of the garage door. That weight is further distributed using two extension springs per door. Each spring supports half of the load.
Dangerous Quick Fixes for Broken Garage Door Extension Springs
When the end of an extension spring breaks, it is possible to continue using the spring by adding either an eye bolt or S-hook. First the last one or two coils of the garage door extension spring are pried apart with a screw driver and the hook is moved into place so that it hooks itself around a section of the extension spring. While this may work initially, it is important to know that the integrity of the spring is compromised. Since it has already broken, it likely will continue to break. Also, the hook you use may come loose at a very inopportune moment, leaving anyone near it in some potential danger.
The best decision is to let a professional replace all the extension springs in your garage at the same time.
Another consideration for the purchase of garage door extension springs is the quality of the metal. China has introduced a lot of low quality steel springs onto the market and these are competing heavily on price. Resist the urge to buy the cheapest springs on the market. It’s very likely you will be replacing them very soon anyway.