Concrete fails before the door does. At a food-grade 3PL in Rotterdam this spring, two dock positions at a 1.15 m (3 ft 9 in) platform height served a fleet with trailer beds from 1.10 m to 1.40 m (3 ft 7 in to 4 ft 7 in), and the apron had spalled to exposed aggregate across roughly 40% of each dock face. Re-pouring was quoted at six weeks of blocked doors. We supplied two exterior dock levelers instead; the doors were closed for four working days.
How the Problem Showed Up
Two patch repairs had already failed. De-icing salt and wash-down water reach the joint between the apron slab and the dock face, freeze, and lift the slab edge; once the edge breaks out, every forklift wheel strike takes another piece with it. By the time the operator called us, the leading 300–500 mm (12–20 in) of each apron was gone. The dock-to-trailer gap had also opened to about 180 mm (7 in), because drivers had started stopping short of the damaged edge — and a lip with under 100 mm (4 in) of bearing inside the trailer bed is not a safe bridge, whatever the capacity plate says.
There is a compliance angle too: since 17 January 2017 a dockboard in service must prevent transfer vehicles running off its edge, and the vehicle must be chocked or fitted with sand shoes while anyone works on it. Concrete patching solves neither.
Why the Retrofit Beat Re-Pouring
We priced both routes, including the arguments that favour concrete. Typical 2026 contractor ranges for North American loading dock concrete work — indicative, and highly market-dependent — look like this:
| Route | Cost per dock position | Door downtime | Expected life |
|---|---|---|---|
| Spot patch, under 100 sq ft | $500 – $1,500 | 3–7 days curing | 3–7 years |
| Partial resurface, 30–50% of slab | $2,000 – $4,000 | 1–2 weeks | 8–12 years |
| Full replacement, demo and new slab | $8,000 – $25,000+ | 4–8 weeks | 15–25 years |
| Exterior leveler retrofit | Equipment cost only | 2 days per position | 15+ years of steel |
Concrete wins one point, and we said so in the proposal: a full replacement is the cheapest way to restore a genuinely sound, flat apron. It loses on the two things this operator cared about — it needs warm, dry curing weather, which Rotterdam in March gave us neither, and it stops the door for weeks, not days.
We were equally blunt about the limits. An exterior leveler bridges the damaged face; it does not rebuild the slab. Concrete under and behind each anchor point has to be cut back to sound material, and the face has to be close enough to plumb that the bolt pattern needs no shimming past 10 mm (0.4 in). Where the face was too far gone we cast two anchor pads — still two days, not six weeks.
What We Supplied
Both positions took the same unit: our HLSH-EXT exterior dock leveler, electric-hydraulic, mounted to the outside face of the dock, no pit and no demolition inside the building.
| Parameter | Specification |
|---|---|
| Model | HLSH-EXT, 1830 × 2280 – 10 t exterior build |
| Rated load | 10 t / 22,000 lb |
| Platform | L 2,280 × W 1,830 × H 490 mm (7 ft 6 in × 6 ft 0 in × 1 ft 7 in) |
| Mounting | Exterior, surface-mount to dock face, no pit |
| Height adjustment | −300 mm to +450 mm (−1 ft 0 in to +1 ft 6 in) |
| Adjustment time | 30 seconds or less |
| Drive | 1.1 kW motor, 380 V three-phase (220 V build available) |
| Deck | Q235B checkered plate, sand-blasted and high-temperature baked finish |
| Rated service life | 15+ years |
The 2,280 mm (7 ft 6 in) platform length was the deciding dimension: it clears the 180 mm gap at the damaged face and still leaves over 100 mm of lip bearing at the bumper.
Install Sequence: Two Days per Position
Day one was concrete: cut back to sound material, chip the face, cast the anchor pads, cure overnight on a rapid-hardening mix. Day two was steel and electrical: lift each unit with the site forklift, set it level to within 5 mm across the 1,830 mm platform width, torque the anchors, wire the control box, then cycle the deck through its full −300 mm to +450 mm range twenty times unloaded before the first truck arrived.
Two conditions we insisted on. The control box went on the wall inside the door, not the weather side — the units sit outdoors, and a live 380 V enclosure facing North Sea rain is a maintenance appointment waiting to happen. Every operator was also walked across the deck with a trailer in place, because free-floating mode lets the platform follow the trailer as it rises on its suspension.
Twelve Months Later
The apron has not been touched since. The levelers have run two shifts a day, five and a half days a week, with two oil-level checks and one lip-hinge lubrication in the service book. Height adjustment averages 18 seconds against a 30-second rating, and drivers no longer stop short of the edge, so the trailer gap is back to a normal 100–120 mm.
What we would do differently: cut the old apron back further behind the anchor pads. One pad cracked along an old repair seam in month seven and needed re-casting — a two-hour job that was avoidable.
Frequently Asked Questions
Can an exterior dock leveler permanently replace a failing concrete apron?
No. It bridges the damaged face; it does not rebuild the slab. Expect to re-pour the apron when the doors can afford the downtime.
Does an exterior dock leveler need a pit or concrete cutting?
No pit, and no cutting inside the building. It bolts to the exterior dock face; only unsound concrete behind the anchors is cut back and recast.
What capacity should I specify when the apron edge is broken?
Size on the heaviest loaded forklift and add margin; the working grade at a damaged face is rarely ideal. A 10 t (22,000 lb) unit covers an 8 t truck with a 2 t load, but fleets running 10 t trucks daily should specify 15 t.
How long does an exterior leveler last outdoors?
The deck is listed at 15+ years. In coastal or de-icing-salt conditions, budget for a two-yearly touch-up on the frame and hinge line rather than the deck plate.
Get a Retrofit Opinion Before You Pour Concrete
Send photos of the dock face, your trailer bed height range and your heaviest loaded forklift, and we will tell you plainly whether a HLSH-EXT exterior dock leveler bridges the problem or whether concrete has to come first. See the exterior dock leveler range and the dock levelers we build for pit installation, or browse mobile yard ramps if you would rather leave the slab alone. Every unit ships with CE declaration, load test report, English manual and drawings; send your site details via the contact page for a drawing and an EXW price within one working day.
