Sectional garage door
Sectional garage doors are characterized by their horizontal panels that are hinged and which (guided by rollers) roll along a system of tracks that runs up alongside the garage door opening and curve at the top into horizontal tracks to follow the garage roofline. The weight of the door is balanced by either a torsion spring system or a pair of tension springs (* see below). Sectional doors do not require any space outside the garage to open. A vehicle may park very close to the garage before opening the door.
The individual panels have two rollers per panel giving a very rigid and positive movement. The number and size of panels will depend on the size of the garage door opening, and they are available in single, double, or custom sizes. A typical sectional door for a double garage usually has five hinged panels from top to bottom. A door can be ordered that has the top row of panels containing windows.
Sectional garage doors are manufactured and available in a number of designs. They can be made from fibreglass or wood. Wooden sectional garage doors enhance the elegance with their rich appearance. They however require a lot of maintenance from the homeowner in order to maintain their quality. Their designs are also more flexible than fibreglass doors.
Sectional Garage Doors come in a number of colours, and can be manual or automatic, the latter being the more popular, simply because you do not have to leave the car to open the door yourself, which would be an inconvenience in bad weather and might put you at risk from possible hijacks. These doors usually feature an automatic lock that locks itself when the door reaches its fully closed position. Due to the multiple parts, there are high chances of damage and need for replacement. Nevertheless, this doesn’t have to be the case as simple care of cleaning and lubrication is sufficient maintenance.
The mechanisms of operations coupled with the maintenance costs make the overall sectional garage door prices high in comparison with their alternative. However, with the comfort and efficiency they bring, they are worth their value in money.
Torsion spring lift mechanism
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.
Tension spring lift mechanism
A extension spring counterbalance system consists of a pair of stretched springs running parallel to the horizontal tracks. The springs lift the door through a system of pulleys and counterbalance cables running from the bottom corner brackets through the pulleys. When the door is raised, the springs contract, thus lifting the door as the tension is released.
Tip-up garage doors
Tip-up garage doors consist of one large panel. These doors are available in a number of designs but generally operate with side mounted lifting arms (jamb arms) with tension springs attached on either side of the door. These open the door into the garage on horizontal steel runners using rollers. Opening the solid panel half in and half out of the garage door opening. A disadvantage of tip-up doors is that the swing up arc of the door occurs partially outside the garage. This means a vehicle must stop and park several feet in front of the door to avoid being hit by the garage door when it is opened. Tip-up garage doors can be manual or automatic, the latter being the more popular, simply because you do not have to leave the car to open the door yourself, which would be an inconvenience in bad weather and might put you at risk from possible hijacks. These doors usually feature an automatic lock that locks itself when the door reaches its fully closed position.
Roll-up Garage Doors
Roll up garage doors are made out of chromadek or galvanised steel. The door is designed in such a way that they consist of one large corrugated steel curtain, these corrugations give the door strength against impacts and allow the curtain to roll, through guides, and eventually around a metal drum placed above the doorway on the interior wall. A roll up garage door has a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door.
Roll Up garage doors can be manual or automatic, the latter being the more popular, simply because you do not have to leave the car to open the door yourself, which would be an inconvenience in bad weather and might put you at risk from possible hijacks. These doors usually feature an automatic lock that locks itself when the door reaches its fully closed position. Metal Roll Up garage doors are available either as a galvanized, plain steel colour, or in a number of chromadek colours, which can be chosen to suit the decor of the exterior of your house.