A torsion spring counterbalance system consists of one or two tightly wound up springs on a steel shaft with cable drums at both ends. The entire apparatus mounts on the header wall above the garage door and has three supports: a center bearing plate with a steel or nylon bearing and two end bearing plates at both ends. The springs themselves consist of the steel wire with a stationary cone at one end and a winding cone at the other end. The stationary cone is attached to the center bearing plate. The winding cone consists of holes every 90 degrees for winding the springs and two set screws to secure the springs to the shaft. Steel counterbalance cables run from the roller brackets at the bottom corners of the door to a notch in the cable drums. When the door is raised, the springs unwind and the stored tension lifts the door by turning the shaft, thus turning the cable drums, wrapping the cables around the grooves on the cable drums. When the door is lowered, the cables unwrap from the drums and the springs are rewound to full tension.[7]
"The doors, tracks and openers were installed in a few hours. They look great and add so much to our exterior as well as quiet and warmer in the garage. The technicians tweaked the pad installation as we needed. They were on time, professional and courteous. I give them 5 stars. My only ding on performance was filling up our rolling recycle bin with intact noses that we had to pull out and break down. I thought the boxes would have been hauled away."
Roller doors ("Sheet Doors"-USA) are usually constructed of corrugated steel. They evolved from cover window and door coverings.[4] Other materials can be used (e.g.; transparent corrugated fibreglass) where strong impact resistance is not required. Corrugations give the door strength against impacts. A typical single car garage roller door has a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door. Larger roller doors in commercial premises are not sprung (except USA) and use a manual pulley and chain system or a geared motor to raise and lower (roll up and roll down) the door. Roller doors cannot be effectively insulated.
The lightweight design also causes a decrease in the insulation of these doors, so individuals that live in colder climates may want to consider other options for their garage door needs.  Fiberglass does not corrode when subjected to salt-water like some other door styles out there.  Individuals that live in coastal areas will find this feature beneficial for their needs.
Sears can fix almost any broken garage door opener, regardless of the brand or where you bought it. Trying to repair a garage door opener yourself can be dangerous because of the spring tension. The Sears technicians who repair garage door openers are experts; they have the knowledge and experience to repair the garage door opener correctly and safety.
Whether you're planning on moving in the future or you're fixing up your forever home, replacing a garage door can provide an excellent return on investment and boost your home's resale value. According to Remodeling magazine's 2016 Cost vs. Value report, garage door upgrades provide a nationwide average return on investment of over 90%, making it one of the top five home improvement projects. To learn more about the cost of installing garage doors, visit our garage door and opener installation and repair cost guide.

Carriage: These doors mimic the look of doors found on old carriage houses in the days of horses and buggies. Because of their rustic look, they are often favored in the West and Southwest of the United States. The doors swing open like oversized French doors and hang from jambs on hinges. With their unique look, they create an area of visual interest for your home and are quite energy efficient. The downside is they require a considerable amount of clearance to work properly. Because most carriage garage doors are largely composed of wood, you may need to replace deteriorating or rotting door materials. The average cost for carriage garage door repairs is $133.

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