Spring index lower limit: DASMA standard 102-2004 provides a lower limit of 6 for the spring index, which is symbol C in our formulas above (section 9.3). Other interesting items in this standard include an upper limit for how much the door sags when raised (no more than 1/120 of its width, section 9.2.1), that each of the two bottom brackets should sustain twice the door assembly's weight (section 9.2.2) for a total safety factor of about 4, and that the lift cables should provide a safety factor of 5.
As in an elevator, the electric motor does not provide most of the power to move a heavy garage door. Instead, most of door's weight is offset by the counterbalance springs attached to the door. (Even manually operated garage doors have counterbalances; otherwise they would be too heavy for a person to open or close them.) In a typical design, torsion springs apply torque to a shaft, and that shaft applies a force to the garage door via steel counterbalance cables. The electric opener provides only a small amount of force to control how far the door opens and closes. In most cases, the garage door opener also holds the door closed in place of a lock.
No matter your service need, our garage door specialists in Houston are ready to help. We provide routine maintenance of your garage doors and gates, repairing broken components, and installing new doors and gates. You can always depend on Garage Service Pros to deliver speedy yet effective service. With same day service and availability 24-hours for emergencies 7 days a week, you will always have someone on the other end of the line when you need us most. We take great pride and provide excellent customer service in the following locations.
Most styles, whether traditional or contemporary, feature panels, trim, and other detailing. Doors with true frame-and-panel construction tend to be sturdier than those with decorative detail that is merely glued or nailed on. Many styles have glass panels on the top row, which looks inviting from the street and brings daylight inside. You can also find roll-up doors with shatterproof glass or frosted plastic in all the panels, for a more modern look.

You must use springs that are matched to the weight of the door. You cannot compensate for the wrong size spring by adjusting the number of winding turns. If you do not know a proper spring size, then you or your spring supplier must calculate a proper size (see below) based on an accurate weight (within 5 pounds) of the door. So you must then in turn have an accurate weight.
Keep in mind that when the springs are released there is nothing to help with weight replacement. Garage doors weigh 150 pounds or more and if the door were not locked in place, there would need to be some way of holding it up until it can be lower manually. If no one is available to help, a clamp can be put on the track at the end of the door (Image 1). When ready, release the clamp and take the weight of the door.

Spring rate and torque: In my spring replacement above, the wire size was d = 0.2253 inches, and the ID was 2 inches, giving a mean diameter D = 2.2253 inches. The number of coils is L/d = 24 inches / 0.2253 = 107, less about 5 dead coils on the winding cones, or 102 active coils. Thus the spring rate is K = (π*28.5*10^6 * (0.2253)^4) / (32 * 102 * 2.2253) = 31.8 in-lb/turn (IPPT). Winding 7.5 turns * 31.8 in-lb/turn yields a torque of 238 in-lbs per spring.


The classic telephone bait-and-switch: This time-honored swindle, also called "false advertising", can show up in the garage door business. Here's how this scam works: When you call and say you have a broken spring, and ask for a repair price, you are told over the phone that the price is X dollars, which typically might seem a little better than the competition. When the repairman shows up, after looking at your broken door, he will casually and matter-of-factly tell you it will cost 2X. If they told you over the phone that it would cost X, well, that was only for one spring, and he must (he must, mind you) install not just one, but two. He will act surprised if you object, as if you should have known that from what you were told over the phone. If you expected to really pay just X, it was your fault for misunderstanding because you don't know anything about how garage doors should be repaired. (You will feel intimidated at this, since you honestly don't know anything, else why would you have called a repairman? Intimidation is a powerful tool against customer resistance.) If your door used only one spring to start with, he will insist on converting yours to two, telling you it is safer the next time a spring breaks. If you originally had two springs, he will tell you that he must replace both springs, and you must therefore pay double what was quoted. While it is true that converting or replacing both springs is a good idea, the bait-and-switch pricing is not. The "bait" is the low price quoted to you over the phone, which they never intended to honor, and the "switch" is switching the price to something higher on a pretense. This method of selling is literally criminal (for example, see Florida Statutes 817.44, all states have similar laws), but a service business can usually avoid detection or prosecution because there are no printed advertisements or other tangible evidence, just one-on-one phone calls. If you find yourself in the middle of this trap, then the proper response is to dismiss the repairman without paying a nickel. Don't expect that you will be able to negotiate a fair price with someone who is using criminal business methods. Certainly don't expect that he will accept a lower price because you accuse him of false advertising. If you absolutely cannot wait for another service call, then you'll have to accept the fraud, in which case you should do so quietly. People that use these methods typically have ways to mentally justify their behavior to themselves as a reasonable business practice, and won't react well to your suggesting otherwise, even though they are in fact small-time criminals, not shrewd businessmen.
Direct Drive - Unlike chain- and belt-driven systems, where the motor remains stationary while moving a chain, a direct drive motor moves while the chain stays in place. Because of this, the only moving part is the gear the motor uses to move while lifting the door. To our knowledge, only one company makes direct drive garage door openers: Sommer. The company claims the motors are more efficient and quieter than any other type of opener. However, this is the most expensive type of opener we’ve found, costing around $286 on average.
J&S Overhead Garage Door Service also specializes in garage door opener repairs including broken gears, safety sensors, garage opener and chain adjustments and even remote and keypad replacements. Our technicians service major brands and carry necessary parts ad equipment parts on the trucks so you will never have to wait for a repair. If your opener can’t be repaired we do offer same day and same appointment professional installations offering several different garage door opener including chain and belt drive options.
It you have a tilt-up door, you are looking at a $150 - $200 repair or replacement. If it's a roll-up door it's going to cost you more. Roll-up door spring repair or replacement is usually around $200 - $250 for a 2 car door. If the brackets need to be disassembled to remove the springs due to the shaft not sliding sideways enough it will cost you an additional $50 - $100.

You must use springs that are matched to the weight of the door. You cannot compensate for the wrong size spring by adjusting the number of winding turns. If you do not know a proper spring size, then you or your spring supplier must calculate a proper size (see below) based on an accurate weight (within 5 pounds) of the door. So you must then in turn have an accurate weight.

In Maryland, wildfires are not common. However, thunderstorms are, and they often take out the power. Do not get stuck when power outages occur again. Consider a battery backup. If you are interested in finding out more about it, simply give us a call. Want to know which openers have them? Please take a look at these Precision-preferred garage door openers.


When ordering springs, be aware that a number of different sizes of springs will make proper replacements, not just the specific size being replaced. The wire size, winding diameter, and length can be traded off to make springs of varied geometry but equivalent torque characteristics. This will also affect the expected lifetime (in cycles) for the spring(s). Since the critical specification for a replacement is the weight it is designed to bear, not the sizes per se, there are likely several stock sizes that replace a given old spring. The spring distributor's inventory may happen to offer only a different size with an equivalent weight-bearing specification. One has to judge whether to trust the advice of the seller in such situations. The seller should have the data to know what substitutions are proper.
Ryan Fleming, Technician with Precision Door replaced a broken garage door spring at our home last night and I was so impressed with his knowledge, professionalism and positive attitude that I felt compelled to write this review. We have been customers of Precision Door for over 5 years and have always been pleased with how promptly and cost effectively they perform repair and maintenance work. I highly recommend both Ryan and Precision Door.read more
We offer wide range of stainless metal appliqués. Brushed metal effect or painted any RAL colour. Appliqués will suit most demanding design requirements. If you can’t find what you like an option could be your personal design appliqué. Just send a picture or drawing and we will replicate it on your door. Use our recommended designs or create your own:
The "liability" angle: The flip side of "safety issue" is "liability". This is not used to directly sell you something; it is used to demean the cheaper alternative and prod you into buying a more expensive (and profitable) option. For example, you may be pressured into buying a whole new door, when you just need a new spring, by the salesman telling you he can't just replace the spring due to "liability" issues. Since product liability is a big burden on the garage door industry, and so many old doors (and especially automatic openers) are dangerous, this may be a genuine reason to accept a higher price.

We are a family owned and operated, local garage door company in the Carlisle area that believes in attention to detail and an emphasis on customer service and satisfaction. We even offer same-day service because we know that when your garage door isn’t working the way it should, you need it fixed fast. We offer affordable rates that will fit your budget, and we’re confident you won’t find another garage door installation company in Carlisle or the surrounding areas with the same dedication to our customers and the quality of our work at the affordable rates we offer our clients.

Those who benefit from this anti-competitive behavior have many excuses for it. They claim that the product is too dangerous and infrequently needed for the public to purchase directly. They say the job is hazardous and requires techniques and tools with which the amateur will rarely practice, which is true. They write me in anger saying I don't understand how expensive it is to put a truck on the road with a technician and parts and salary and benefits and insurance and advertising and every other common business expense. They say it will take the homeowner hours of effort to do this safely and correctly, while they can do it in a fraction of that time and at a price that isn't worth the effort to save. But should they set themselves up as the judge of what you can and cannot do? Of what is an economical use of your time? Imposing minimum order quantities or charging retail prices for small orders is legitimate; inquiring into the purchaser's background is not.
You’ll never have a difficult time reaching us here at Absolute Overhead Door. You will speak to another person 24/7 – never an answering machine or computer – no matter if you call day or night. Our team will always be ready to answer any questions that you may have and get a plan and schedule underway to fix everything from a broken spring, garage door opener, to a broken garage door that needs complete and new installation. If you need us to replace broken springs, you or your teenage driver backed into the garage door, or in the market for a new door install or upgrade, we’ve got you covered! We provide garage door service from 8am to 6pm – with no extra charge for evenings and Saturday’s. Absolute Overhead Door Service also provides 24-hour Emergency Service with minimal charge. We are your garage door repair and broken spring experts! If you have an unknown issue with your garage door or an issue with your garage door opener, give us a call today for guaranteed same day service. 

Another moment of truth arrives as the winding-up of the springs begins. (I am just posing here with the camera held out in my left hand. Except for lifting the door onto the scale, this was a one-man job, including the photography.) The position of the bars in this photo was necessary to take the photo, and does not show a correct winding technique, You should not have to swing the bar up as high over the top as shown. The lower bar during winding should swing from pointing down to pointing a little past horizontal. Then you hold that bar horizontal while socketing the other bar pointing down, apply force to that (now) lower bar, then remove the (now) upper bar, wind one-quarter turn, and repeat.
Since 1989, Henderson Garage Doors has specialized in the sale, installation, service and repair of residential and commercial door systems throughout the Baytown area. A family-owned and operated company, we’re committed to offering the finest products and delivering best in class service. We’re proud of our reputation for prompt, professional, and reliable service and we’d like to welcome you to the Henderson Family!
Powerful, quiet and durable, Overhead Door® automatic garage door openers are designed for performance. And when you combine an Overhead Door® opener with one of our doors, you get an integrated system that maximizes performance and reliability. Our full line of automatic openers features a variety of power levels and specifications to handle different garage door weights and sizes. Each opener also comes with built-in, standard functions for the ultimate in safety, convenience and power. Don't know which opener to choose? Find the answers to some common questions to make sure you're buying the right garage door opener​. We offer a wide variety of additional garage door opener accessories.​​​
The disaster-is-nigh technique: As he inspects your door, the serviceman grimly calls your attention to "cracks" in your garage door. These appear very faintly in the middle of the door where the panels bow under their own weight when the door is up. This is normal, but the type of thing you wouldn't casually observe yourself. This surprising revelation disarms you, and you may find yourself strangely susceptible to the pitch for an entire new door.

Since 1975, Kitsap Garage door has provided Kitsap Penninsula with reliable, comprehensive and responsive residential and commercial garage door repair, maintenance and installation services. At Kitsap Garage Door, our primary focus is offering Bremerton, Shelton and Kitsap, WA, home and business owners with the highest quality products and services, as well as exceptional customer experiences marked with free service estimates, workmanship warranties, reliable support and emergency services.


Garage Door Installation – This includes the installation of a new garage door. Includes the door itself, the track, cables, springs, hinges, handles, locks and rollers. It is the complete service and installation of a new door. We inspect all the parts, make adjustments to fit your garage opening, and service all elements during the installation process. Plus, we check to ensure all parts are in proper working order after installed.

Garage doors cause injury and property damage (including expensive damage to the door itself) in several different ways. The most common causes of injury from garage door systems include falling doors, pinch points, improperly adjusted opener force settings and safety eyes, attempts at do-it-yourself repair without the proper knowledge or tools, and uncontrolled release of spring tension (on extension spring systems).
Repair Sagging Garage Doors – As doors and homes age, they can shift and move and sometimes this results in a garage door that needs to be realigned or reinforced. We will send a technician to your home to adjust the doors and to inspect the entire opening to make sure the door isn’t damaged. Once we understand the problem, we will fix the needed parts and make any adjustments to the door.
The material and style of your door as well as the replacement parts needed will impact the total cost of your project. It would cost less to install a steel door with no opener then it would to install a wood door with an opener etc... High tech doors come with enery-effecient glaze and thick insualation as well as finshed interiors and other upgrades. These doors are more expensive but are more reliable and durable.

Garage door frames and mouldings will freshen up the appearance of your garage and garage door. We offer frames in a broad assortment of finishes and widths, so you can find the perfect fit for your garage. Update or repair the hardware on your garage door with our wide selection of our garage door parts and accessories. Some of the accessories we offer include cables, hinges, reinforcement brackets, and locking door handles.
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