Dock Bumpers & Fenders

They absorb the impact of a reversing trailer and, just as importantly, they hold the trailer at a fixed distance from the building. That standoff is what protects everything else on the dock: the seal or shelter in front of the wall, the leveler lip, the door track and bottom section, and the concrete face itself. A bumper is a sacrificial component — it is meant to wear out, and replacing it is far less expensive than replacing what it protects.

Four signs, any one of which is enough. The bumper is worn to roughly half its original thickness. Any steel — bolt heads, washers, the mounting angle — has become visible or is being struck. A laminated bumper's pads have begun to separate or fan out. Or the trailer is now touching something it should not: fresh damage to the seal, the leveler lip, or scrape marks on the wall are all evidence the bumpers have stopped doing their job.

A laminated bumper is built from stacked pads cut from rubber tire carcass, threaded onto a steel rod between angle plates. It is inexpensive, easy to replace and the most common type on Ontario docks. A moulded bumper is a single piece of moulded rubber, more uniform and generally longer-lived under heavy or angled impact but costlier. A steel-faced bumper adds a steel plate, sometimes on rollers, for very high-cycle docks or where trailers ride up and down the face as they are loaded.

Far enough that the trailer stops before it reaches anything behind it — which means the bumper must stand proud of the compressed depth of your dock seal, not its relaxed depth. Four inches of projection is a common minimum on a plain dock face, and more is needed where a seal or shelter is fitted or where the dock face is set back. This is the single most common error we find: correctly sized bumpers that do not project far enough, because the seal in front of them was never accounted for.

Effectively, yes. A bumper change is a short job per position — the bay is unavailable for that time and its neighbours keep running. The work is normally scheduled around your shift pattern and often done on the same visit as leveler or door maintenance. What can extend it is what we find behind the bumper: spalled concrete or a corroded mounting angle needs repair before a new bumper can be fixed properly.

Usually one of three things. The dock face concrete has degraded, so the anchors no longer hold — the bumper is fine, the wall is not. The bumpers are undersized for the traffic and are being overwhelmed rather than compressed. Or trailers are arriving at an angle, which loads one bumper alone and can shear it off; that is normally a driveway geometry or guidance problem, and painted guide lines or a bumper with more projection at the approach side is the fix.

Yes — most bumper work is on existing docks of all ages and makes. Bumpers are largely generic, so what matters is measuring the existing mounting, the projection required in front of your seal, and the state of the concrete behind. We will tell you if the honest fix is concrete repair rather than a new bumper, because a bumper bolted into failing concrete will not stay on.

There is no useful figure in years, because life is set by cycles and by how squarely trailers arrive, not by time. A quiet bay taking a van a week may go a decade; a high-volume grocery dock may need bumpers every couple of years. This is why bumper condition is checked on every maintenance visit rather than replaced on a calendar — inspection is what tells you, and it takes seconds.