Hollow metal frames are the part of a commercial opening nobody looks at until something stops working. They are quiet, they are painted the same colour as the wall, and they routinely outlive two or three doors. When they do fail, the symptom almost always appears somewhere else — a door that will not latch, a closer that cannot control the swing, a card reader that releases but the door does not open.
By the time a facility calls, the usual request is to fix the door or replace the hardware. Often the frame is the job, and knowing what can be saved and what cannot is the difference between a repair that holds for years and one that comes back each quarter.
How Hollow Metal Frames Fail
Rust at the floor line
This is the most common failure in Ontario buildings and the most predictable. The bottom few inches of a frame sit where water, snowmelt, road salt and floor-cleaning chemicals collect. Frames in vestibules, loading areas, stairwells and back-of-house corridors get all four.
Corrosion starts on the inside face of the jamb where nobody sees it, works outward, and eventually the base of the frame delaminates into layers. The frame may still look acceptable from the corridor and have nothing left to anchor to at the floor. That is when the jamb starts moving under load, and the door’s behaviour changes with it.
Spread at the strike
A frame is held rigid by its anchors and, in a grouted frame, by the fill. Years of a door being pulled shut against a latch, plus the occasional shoulder from someone whose key did not work, push the strike jamb away from the door. The gap at the latch grows a few millimetres, and the latch stops reaching far enough into the strike.
The symptom is a door that latches sometimes. It is routinely treated by adjusting the strike, which works until the jamb moves again. The actual cause is a jamb with nothing holding it in position.
Hinge-side deformation
The hinge jamb carries the whole weight of the door as a cantilever. Where hinge screws have pulled, where a hinge reinforcement has torn, or where an oversized door was hung on undersized hardware, the jamb bows. The door then drops at the latch edge and drags on the floor or the head.
Impact damage
Carts, pallet jacks, deliveries and stretchers. The dent itself is usually cosmetic. What matters is whether the impact broke the frame’s connection to the wall. A frame that has been knocked loose will keep producing hardware faults no matter how many times the hardware is replaced, and that is the point where a proper commercial door repair assessment should start at the opening rather than at the door.
Reading the Opening Before Blaming the Hardware
A short sequence that tells you where the problem is:
- Measure the gap along the latch edge, top to bottom. It should be consistent. A gap that widens toward the middle means the jamb is bowed; one that widens at the top means the door has dropped or the head is sagging.
- Open the door to 90 degrees and watch the hinge jamb. Any visible movement as the weight transfers means the jamb or its anchors are not holding.
- Press firmly on the strike jamb at latch height. If it flexes, the latch problem is a frame problem.
- Look at the bottom six inches of both jambs, including the back face. Flaking, bubbling paint, or layers lifting means corrosion is already structural.
- Check whether the frame is grouted. Tap it. A hollow sound at mid-height on a frame that should be filled suggests the fill has broken down or was never completed.
If steps 1 through 3 point at the frame, replacing the latch, the closer or the strike will not resolve the complaint, and the next call about this opening is already scheduled.
What Can Be Saved
Hollow metal is repairable to a greater extent than most people expect, which is why writing off a frame too early is as costly as patching one too long.
Repairable in place
- Base corrosion with sound material above it. Cutting out the deteriorated section and welding in new material is standard work, and on a frame that is otherwise straight it restores the anchorage properly.
- Pulled hinge reinforcements. New reinforcement can be welded in and the jamb re-drilled. This is far better than moving to longer screws, which is the field fix that eventually tears out more material.
- A spread strike jamb, if the frame is still anchored. Pulling the jamb back and adding anchors or fill addresses the cause rather than chasing the strike.
- Dents and gouges on a frame that is still square and secure — a cosmetic repair, correctly treated as cosmetic.
Past repair
- Corrosion extending into the anchor zones or up the jamb. There is no sound material to weld to.
- A frame that is out of square beyond adjustment, usually from building movement or a significant impact. Forcing a door to fit a twisted frame transfers the problem to the hardware permanently.
- A fire-rated frame whose label is gone, unreadable, or whose integrity has been compromised. This one is not a judgement call in the field. A rated assembly is rated as a whole, and modifications or repairs outside what the listing permits void it. Where the opening is required to be rated, that becomes a fire-rated door and frame question, and an inspector will treat a missing label as a deficiency regardless of how sound the steel looks.
- Frames that cannot accept the hardware the opening now needs. Adding an electric strike, a different closer, or an exit device to a frame with no preparation and no room for reinforcement is often more expensive than replacing the frame.
Where replacement is the answer, the practical question is usually whether the frame comes out with the wall finish intact or whether a knock-down replacement can be fitted into the existing opening. That decision drives most of the cost and the downtime, and it is the main reason replacing a commercial door and frame is priced on access and construction rather than on the hardware.
What Facilities Can Do to Slow It Down
- Keep floor-cleaning chemicals and standing water away from the base of frames. Most base corrosion in otherwise dry buildings comes from mopping, not weather.
- Touch up paint at the floor line before rust appears, not after. Primed and painted steel at the base buys years.
- Fit proper protection where carts travel, rather than waiting for the dents.
- Record the openings that keep generating hardware calls. A frame problem shows up as a pattern in the service history long before it is visible.
- Photograph and record fire-door labels while they are legible. Replacing a lost label is not a field task.
Frequently Asked Questions
Can a rusted frame base just be filled and painted?
Filler restores the appearance and nothing else. If the corrosion has reached the point where the frame is no longer anchored at the floor, filler leaves a jamb that still moves under load, and the hardware faults continue. Where the deterioration is cosmetic, filling is reasonable; where it is structural, it is cover.
How do I know whether my frame is grouted?
Tapping along the jamb is the quick indicator — a filled frame sounds solid, an empty one rings. The distinction matters because a grouted frame is considerably more resistant to spread, and because welding on a grouted frame is a different job than on a hollow one.
Our strike plate has been adjusted three times this year. Is that normal?
No. Repeated strike adjustment on the same opening is the classic signature of a frame that is moving. Each adjustment works until the jamb shifts again. The useful next step is checking the jamb for flex and the anchors for integrity.
Can we replace the door and keep the frame?
Often yes, and it is frequently the sensible choice — frames usually outlast doors. It depends on the frame being square, secure and prepared for the hardware the new door needs. If the frame is the thing that failed, a new door will present the same symptoms within months.