A tenant calls because the front door of their unit has started catching on the floor and will not latch without a lift. Someone goes out, looks for the hinges, and finds none. There is a small cap at the top of the door, a plate at the bottom, and nothing down the jamb at all.

That is a centre-hung aluminum door, and almost every storefront, office entrance and plaza unit in the GTA is built this way. It does not have hinges. It rotates on two pivots, and when it drops, sags or binds, the pivots are where the answer lives.

How a Centre-Hung Door Actually Hangs

The door’s whole weight sits on a bottom pivot, which is a bearing assembly either mounted to the floor or housed in a closer buried in the slab. The top pivot is a locating pin: it keeps the door vertical and does almost no load-bearing work. Between them they define a single axis, and the door swings around it.

That arrangement has two consequences worth understanding. First, there is nothing distributing load the way three hinges do on a residential door, so wear concentrates in one spot. Second, because the axis sits inboard from the door edge rather than on it, a centre-hung door swings both ways and needs clearance at the jamb on both faces — which is why these doors are so sensitive to a frame that has shifted even slightly.

Offset Pivots Are Not the Same Thing

Some aluminum doors use offset pivots, where the axis sits close to the door edge like a hinge would. They look similar from across a lobby and behave differently: offset doors swing one way, and the top pivot carries more load. Knowing which you have changes the parts list, and the easiest tell is whether the door can push both directions.

What Goes Wrong

The Bottom Pivot Wears Out

This is the headline failure. A bottom pivot is a steel pin in a bearing, and it carries the full weight of a glass-and-aluminum slab through every cycle of a busy entrance. Grit and winter salt get into it, the bearing wears oval, and the door begins to settle.

The symptoms arrive in a predictable order. First the door rubs the threshold slightly on opening. Then it stops self-centring and needs a nudge. Then the top of the door starts contacting the frame on one side, because as the bottom drops the whole slab tilts. By the time it is scraping the floor audibly, the pivot has been failing for months.

The Floor Closer Fails Under the Pivot

On doors where the bottom pivot is integral to a concealed floor closer, the two problems arrive together. A floor closer leaks hydraulic fluid downward into the floor box, which is why nobody notices until the door either slams or stops closing. Once the fluid is gone, the spindle takes load it was never designed to take and the pivot function degrades with it.

A door that slams and drags is telling you both things at once. Replacing the pivot without addressing the closer underneath means doing the job twice.

The Top Pivot Loses Its Adjustment

Top pivots are usually adjustable, which means they can also drift. A loosened top pivot lets the door lean out of plumb, and the door then binds at the top on one side and gaps at the other. This one is genuinely sometimes a simple adjustment, which is why it is worth checking before anything gets ordered.

The Door Corner Itself Pulls Apart

Aluminum stile-and-rail doors are held together at the corners by tie rods or screws under tension. Years of being dragged, kicked and wind-caught loosens those joints, and the door racks — it goes out of square as a frame. A racked door cannot be adjusted straight at the pivot, because the problem is the slab, not the mounting. The test is to measure the diagonals: if they differ, you are looking at a corner-joint issue, and aluminum door repair on that slab comes before any pivot work.

Why Tightening a Screw Does Not Help

People reach for the obvious fix. On a hinge door, a dropped slab often means loose hinge screws, and snugging them up buys time. There is no equivalent move here. The bottom pivot is a bearing: when it is worn, it is worn, and the only correction is replacement. Tightening the mounting plate holds the worn bearing more firmly in the wrong position.

The other common mistake is adjusting the threshold or the sweep to clear the dragging door. That makes the noise stop and leaves the door still sitting on a failing bearing, now with its weather seal compromised too. It is the sort of fix that gets discovered later, usually in January.

What an Inspection Looks At

On a door that drags, binds or will not latch, the sequence is fairly fixed.

• Measure the diagonals of the slab to rule in or out a racked door.
• Check the gap along the top rail from one side to the other — a taper means the door is leaning, not dropping.
• Lift the door at the latch edge. Vertical play means the bottom pivot bearing is gone.
• Look at the floor around the closer box for staining or residue.
• Check whether the frame is still plumb, because a shifted frame changes every clearance at once.
• Look at the threshold for a bright arc where the door has been sweeping it.

Those six checks separate a pivot replacement from a closer rebuild from a slab repair from a frame problem. They are also the reason an entrance door on a commercial door repair call rarely has only one thing wrong with it — the parts all load each other, so the one that fails first takes the next one with it.

The Timing Argument

A worn bottom pivot is a cheap part doing an expensive amount of damage while it waits. Every day the door sits low, it is grinding its own bottom rail against the threshold, wearing the floor finish, loading the top pivot sideways and stressing the corner joints as the slab flexes through its swing.

Caught at the first rub, it is a pivot. Caught after a season of scraping, it is a pivot plus a bottom rail plus often a threshold. That escalation is the whole reason a dragging entrance door is worth treating as urgent rather than cosmetic, and it is a common theme on door repair in Toronto for commercial entrances that have been quietly getting worse all winter.

Frequently Asked Questions

How do I know whether my door has pivots or hinges?

Look down the jamb on the swing side. If there are no hinge leaves and the door has a cap at the top corner and a plate at the bottom, it is pivot-hung. If it swings both ways, it is centre-hung.

Can a pivot be lubricated instead of replaced?

Lubrication helps a pivot that is dry but intact and can genuinely quiet a squeak. It does nothing for a bearing that has worn oval, because the problem there is lost material rather than friction.

Is the floor closer always under the door?

Not always. Many aluminum doors use an overhead concealed closer or a surface closer instead, with a plain bottom pivot below. Where there is a floor box, it is set into the slab and the whole assembly comes out from above.

Why does the door close fine in the morning and slam by afternoon?

Hydraulic fluid thins as it warms, so a closer with a failing valve or a low fluid level behaves differently across the day. It is a reliable early sign that the closer rather than the pivot is the first thing to deal with.

Does a racked door have to be replaced?

Not necessarily. Corner joints on many aluminum doors can be re-tensioned and the slab brought back toward square. Whether that holds depends on how far it has gone and whether the stiles themselves have deformed.