Every customer, delivery and cart that comes through a commercial door crosses the threshold. At this Ottawa storefront entrance, the old aluminum threshold had been walked smooth down the middle, had pulled away from the sill behind it, and was collecting leaves and grit along its outside edge. On October 6, 2026, we removed it and installed a new aluminum threshold across the opening.
What the Old Threshold Was Telling Us
A threshold tells you how it has been treated if you read it closely. This one showed:
- A worn traffic lane. The raised ribs were worn down and polished through the centre, where people actually walk, while the profile at the ends was more intact. Those ribs are there for grip, and once they wear flat the surface gets slick when wet.
- An open seam along the back edge. A dark gap ran along most of the length where the threshold met the sill strip on the inside, and the strip had cracked along the same line. A threshold that has separated like that usually isn’t held down tightly anymore.
- Exposed fasteners and patches. Fastener heads showed along the top at intervals, and a couple of small patches had been applied along the front edge.
- Debris along the outside edge. Leaves and grit were packed into the joint between the threshold and the concrete outside, the kind of buildup that holds moisture against the edge.
Why This Commercial Door Threshold Needed Replacing
A busy commercial entrance sees hundreds of crossings a day, plus carts and grit that sand the ribs flat. Ottawa winters add salt and freeze-thaw. Once a fastener loosens, the threshold flexes under every step, the back seam opens, and water and grit get underneath. Surface wear is gradual; a loose threshold gets worse quickly. Left alone, that open seam widens through winter, the door seal loses contact, and the substrate under the sill takes moisture it was never meant to see.
Fitting the Replacement to This Opening
Confirmed work on October 6, 2026: the old aluminum threshold came out and a new ribbed aluminum unit was cut and fastened across the opening. A commercial door sill replacement has to fit the length between the jambs, cover the sill depth, and sit at a height the door can close against without dragging. In the after photo, three fasteners are visible across the length of the new threshold, and the back edge sits closed up to the sill strip.
How a threshold is fastened depends on what is under it — concrete, wood or an existing metal sill each take different fasteners, spaced so the unit cannot flex between them. This page does not claim a specific sealant product, accessibility certification or door-sweep replacement on this visit. When a door bottom needs new weather contact after a sill change, that is separate weatherstripping work.
The New Threshold in Place
The new threshold runs between the frames on both sides with full-height ribs across its whole width. There is no open seam along the back edge in the after photo, the fasteners sit flat in the surface, and the bevel steps down cleanly to the sidewalk. The worn lane, the patches and the packed debris are gone — a predictable step at a busy commercial entrance again.
This October 6, 2026 storefront sill job is separate from an earlier commercial door threshold installation in Ottawa, where daylight under a closed door and water at the entrance drove a different sill replacement.
Keeping a Commercial Threshold in Shape Through an Ottawa Winter
- Sweep the edges, not just the middle. Grit and leaves packed along the outside edge hold moisture against the threshold.
- Don’t chip ice off the threshold with metal tools. Use an ice melt suited to the surface and a plastic scraper.
- Rinse salt off in the spring. Salt left sitting on aluminum through the summer keeps working on it.
- Check it each fall. Step on each end and the middle. Any movement, rocking or clicking means a fastener has let go.
- Watch the door bottom. Daylight under a closed door or a sweep that’s torn means the seal and threshold aren’t meeting anymore.
The commercial door maintenance guide covers closers, hinges and the rest of the entrance.
Commercial Threshold and Entrance Repair Across Ottawa
We replace and repair thresholds for storefronts, offices, clinics and multi-unit buildings across Ottawa, from downtown and Centretown out to Kanata, Barrhaven and Orléans. Thresholds are often done alongside closer adjustments, hinge work and weatherstripping on the same entrance.
Is Your Entrance Threshold Loose or Worn Through?
Send a photo of the threshold with the door open and we’ll tell you whether it needs fastening, replacing, or work on the door bottom.
Call or
request a free quote.
Commercial Threshold Questions
How do you size a replacement threshold for a commercial door?
We measure the opening between the jambs, the depth of the sill from inside edge to outside, and the clearance under the door. The threshold is then cut and notched to fit between the frames and chosen at a height that lets the door seal against it without dragging.
Does the door sweep need to change when the threshold is replaced?
Not always. A new threshold changes how the door bottom meets the sill, so the seal has to be checked once the threshold is in. If the sweep is worn or no longer reaches, replacing or adjusting it at the same visit avoids a gap under the door.
Why does the middle of a threshold wear smooth before the ends?
Foot traffic concentrates in a lane through the middle of the doorway. The ribs there take nearly all the abrasion from grit and footwear, while the ends near the frames see much less contact.
Can road salt damage an aluminum threshold?
Yes. Aluminum doesn’t rust, but salt sitting on it through the winter causes pitting and white corrosion, especially in grooves and along edges where slush collects. Rinsing it in the spring and keeping the edges clear slows that down.
How can I tell if my commercial threshold is loose?
Step on each end and in the middle with the door open. If it moves, rocks, clicks, or you can see a gap opening along the back edge, the fasteners have let go and it should be re-secured or replaced before it gets worse.
