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Cantilever Versus Track Sliding Gates
Two ways to carry a gate sideways
Every sliding gate has to be held up while it moves, and there are two main ways to do it. A track gate rests on wheels that roll along a rail fixed to the ground. A cantilever gate hangs in the air, supported by carriages on posts, and never touches the pavement. The names describe where the weight goes, but the choice affects almost everything else: the footprint, the maintenance, the look and the cost of the posts.
How a track gate carries its weight
A track gate has wheels, usually a pair of V-groove or U-groove wheels, set into the bottom of the leaf. The wheels ride on a rail, which may be an angle iron, a steel bar or a channel embedded in a concrete strip. The rail runs the width of the opening and continues alongside it for the full length of the run.
Guide rollers at the top, mounted on posts, keep the leaf upright. Because the track carries the weight, the posts need not be extremely stout. The leaf can also be lighter than a cantilever, since it does not need to span an unsupported distance.
The track is both the strength and the weakness of the design. It is straightforward, inexpensive and robust. It is also a groove or a raised bar in the driveway, and anything that falls into it, such as gravel, leaves or dirt, can stop a wheel. In wet or sandy conditions, a track must be cleaned often and sometimes drained.
How a cantilever gate carries its weight
A cantilever leaf is built with a long frame that extends past the opening. When the gate is closed, a part of the leaf called the tail remains inside two or more carriage posts. The carriages contain wheels that bear the weight, and they hold the leaf at about the height of the lower rail. As the gate opens, the leaf slides through the carriages, and the tail moves out while the front end slides in.
Since the gate is in the air, it clears uneven ground, small drifts of debris and even a bit of slope. There is nothing on the pavement to clean. The cost is stiffness. The leaf has to be rigid enough that its front end does not droop when it is extended, so the frame is heavier and the posts and footings are larger. The leaf also has to be about half again as long as the opening, which affects the run.
Space needs side by side
Both styles need room alongside the opening. A track gate needs a run roughly as long as the opening plus a little for the latch post. A cantilever needs more, because the counterbalanced tail extends the leaf. For a twelve foot opening, a cantilever may need eighteen feet or more of frame length in total, though it only occupies the run when open.
For tight lots, both options have a bi-parting version in which two leaves meet in the middle and each retracts half the distance. This halves the run required on each side but doubles the hardware.
How each deals with uneven ground
A track gate wants a flat, straight, level path. If the pavement has a hump or a dip, the rail will follow it and the gate will rock. Preparing a proper concrete footing for the rail is the biggest part of installation. Where the ground is soft or settles, the rail may move out of alignment over time.
A cantilever sidesteps all of this. The ground can be rough, gravel or lawn, because the leaf does not touch it. Its only ground contact is the post footings. This makes it a common choice for rural or sloped sites, as well as places where the surface is landscaped.
Upkeep compared
A track gate needs regular cleaning of the groove, inspection of the wheels and lubrication of the guide rollers. Wheel replacement is a normal expense. In dusty or leafy settings, expect to sweep often.
A cantilever needs inspection of the carriage wheels, which sit inside enclosed housings and are protected from grit. It also needs checking of the frame for sag or warping. Lubrication points are fewer. Overall, a cantilever tends to ask for less frequent attention but costs more to replace parts when they wear.
Operators and drive
Both styles use the same families of operators, with chain, rack or friction drives. A cantilever's drive attaches along the bottom of the frame, and the lighter drag from the carriages means a smaller operator can sometimes be used. A track gate's drag depends on the condition of the wheels and the track, so a dirty track raises the load.
Limit settings differ slightly. A cantilever's travel is controlled by stops on the frame, and the operator must not push the tail past the carriages. A track gate must not run off the end of the rail. In both cases, the stops should be robust and the limits verified.
Security and appearance
A track leaves a small gap beneath the gate, but the leaf is held low and the wheels are protected. A cantilever hangs a few inches above the ground, leaving a bigger gap for animals and wind-blown debris. A skirt or bottom rail can cover it.
In appearance, a cantilever looks clean with no ground hardware. A track gate shows its rail, though it can be hidden with a flush mounted track. Both can carry the same styles, from flat panels to open bars.
Choosing between them
- If the ground is smooth, level and easy to keep clean, a track gate is cost effective.
- If the ground is uneven, sloped or likely to collect debris, a cantilever avoids the problem.
- If side space is limited, check whether the cantilever tail fits; otherwise choose a track or bi-parting layout.
- If post footings must be modest, track is gentler on them.
- If upkeep time is scarce, a cantilever usually asks for less.
Neither is universally best. A careful look at the ground, the space and the habits of the household settles the question quickly.