Why careful planning is crucial for heavy-duty racking
Installing heavy-duty or pallet racking sounds simple: assemble the frames, hook in the beams, store the pallets. In practice, however, planning errors relating to load capacities and floor loading regularly lead to dangerous situations, up to and including rack collapse. Correct design is not just a question of efficiency, but of workplace safety and legal obligation.
Understanding the three decisive load types
Shelf load, what a single level may carry
The shelf load indicates the maximum permissible load of a single rack level with an evenly distributed load. For pallet racking it is typically between 1,000 and 3,000 kg per level. Crucially, the shelf load only applies with even load distribution. If a heavy pallet is stored off-centre, the rack can be overloaded even though the nominal shelf load is observed.
Bay load, the total load of a rack bay
The bay load describes the maximum total load of a complete rack bay, that is, two frames with all pairs of beams in between. Typical values are 5,000 to 13,000 kg.
Caution: the bay load is not simply the sum of all shelf loads. It can be lower, as the frame statics and the floor anchoring are limiting factors. Anyone who miscalculates here systematically overloads the rack.
Point load, the factor that is often overlooked
In practice, the point load is frequently the limiting factor. Rack frame base plates have a contact area of only 80 to 100 cm². The resulting point load can reach 7 to 8 tonnes per upright foot, an enormous strain on the warehouse floor.
Floor loading: the warehouse floor as the limiting factor
Modern logistics buildings are designed for at least 5 t/m² (50 kN/m²). Older halls or converted buildings often fail to reach this value. Typical floor slab thicknesses are 16 to 30 cm, depending on the load.
Before installing heavy-duty racking, the load-bearing capacity of the floor must be checked, ideally using the building documentation or by a structural engineer. Load distribution plates under the rack feet can reduce point loads, but they are no substitute for a proper structural assessment.
Standards and regulations, what currently applies
DIN EN 15512, structural design
The revised DIN EN 15512:2020 is regarded as the "state of the art" for the structural design of adjustable pallet racking. Courts use it as a benchmark. All manufacturers, planners and operators must take it into account.
DIN EN 15620, tolerances and clearances
Among other things, this standard governs aisle widths and safety clearances:
- No pedestrian traffic: a forklift truck with load must be able to make a 90-degree turn + 200 mm buffer
- One-way traffic: widest load + at least 600 mm
- Two-way traffic: widest load + at least 900 mm
DGUV Information 208-061 (replaces DGUV Regel 108-007)
Since July 2024, DGUV Information 208-061 (a publication of the German statutory accident insurance) has applied as the successor to the previous DGUV Regel 108-007. It governs the construction, operation and inspection of storage equipment and in particular strengthens the training obligations for warehouse staff.
When do you need a structural engineer?
A structural stability verification is required for every racking installation. For standard racking from the manufacturer, the structural analysis is supplied via type approval in accordance with DIN EN 15512. An external structural engineer becomes necessary for:
- Self-built racking
- Conversions or modifications to existing installations
- Uncertainty about the floor's load-bearing capacity
- Combinations of different rack types in one installation
The stability factor against overturning must be at least 2.0.
Mandatory labelling: the load notice
From a shelf load of more than 200 kg or a bay load of more than 1,000 kg, a load notice is mandatory. It must contain the following information:
- Manufacturer or importer
- Type designation and year of manufacture
- Permissible shelf and bay loads
- Maximum load of the unit load
The 10 most common planning errors
- Floor load capacity not checked, point loads of up to 8 tonnes per foot exceed the floor's load-bearing capacity
- Bay load confused with the sum of the shelf loads
- Fewer than 4 bays without reduction, with fewer than 4 bays, load ratings must be reduced by 20%
- Missing impact protection, mandatory for forklift operation, must be anchored to the floor and stand clear of the rack
- No push-through protection on double racks
- Aisle widths planned too narrow
- Load notices missing
- Earthquake zone not taken into account, in zones 1–3 (Rhine Graben, Lower Rhine) seismic design in accordance with DIN EN 16681 is required
- Floor anchoring forgotten
- No annual inspection scheduled
Load capacities at a glance
| Rack type | Shelf load/level | Bay load | Use |
|---|---|---|---|
| Light-duty shelving | 150–300 kg | 1,000–2,000 kg | Small parts, manual loading |
| Heavy-duty shelving | 300–800 kg | 2,000–5,000 kg | Medium-weight goods |
| Standard pallet racking | 1,000 kg | 5,000–9,000 kg | Standard pallets |
| Heavy-duty pallet racking | 2,000–3,000 kg | 9,000–13,000 kg | Heavy industrial goods |
| Cantilever racking | 500–2,000 kg/arm | variable | Long goods, profiles, tubes |
Conclusion: calculate first, then buy
Planning heavy-duty racking does not start with the rack manufacturer's catalogue, but with an analysis of the underlying conditions: floor load-bearing capacity, stored goods, handling frequency, forklift equipment and applicable standards. Those who proceed thoroughly here avoid expensive retrofits, business interruptions, and, in the worst case, accidents involving personal injury.