Cantilever Racking Inspection
Cantilever racking stores long loads — timber, tube, bar, sheet, profiles, trim and body panels — on arms projecting from a single column line. It is inspected to its own methodology because it fails in its own way: the load sits at the end of an arm, so the column base carries a large overturning moment that a pallet racking frame never sees.
The legal position is identical to any other racking. Cantilever racking is work equipment under PUWER 1998, so it must be maintained and inspected — see whether a racking inspection is a legal requirement. What changes is what the inspector measures and which findings carry the most weight.
Why cantilever racking fails differently
On adjustable pallet racking the load is carried between two uprights, tied together by frame bracing, and the load path runs almost straight down. On cantilever racking the load is applied at the end of an arm. That produces bending in the arm, bending and torsion in the column, and a large moment at the base.
Because a cantilever column carries a large overturning moment, its floor fixings matter more than on a pallet frame. Cracked slab around anchors, lifted baseplates and elongated fixing holes are all findings that go straight to the top of the priority list on a cantilever installation.
The cantilever inspection methodology
Six areas, worked through in this order on site, with every finding located to a bay reference, photographed and classified red, amber or green.
1. Arms
- Arm deflection under load — and whether the arm returns straight once the load is removed.
- Drooping or permanently deformed arms, most often from sustained overloading rather than impact.
- Damage to the arm profile itself, including bends near the connection where bending stress is highest.
- Arm locking pins or bolts present and correctly engaged on every arm.
2. Arm-to-column connections
- Cracked or failed welds at the connector.
- Sheared, worn or distorted locating teeth where arms hook into the column.
- Arms not fully seated in the column profile.
- Evidence of arms having been relocated without the load rating being reassessed.
3. Columns
- Column plumb — out-of-vertical columns indicate base movement or overloading, not just cosmetic lean.
- Straightness and impact damage, particularly in the lower section exposed to MHE traffic.
- Twisting of the column profile.
- Corrosion, especially on external, yard-side and washdown installations.
4. Bases and floor fixings
- Cracked slab or spalling concrete around anchors — a priority finding on cantilever, not a minor one.
- Lifted or deformed baseplates.
- Elongated fixing holes, indicating the base has been working under repeated moment loading.
- Missing, loose or corroded anchors, and correct anchor specification for the slab construction.
5. Tie-bracing between columns
- Horizontal and diagonal tie-bracing present, complete and undamaged.
- Bracing bolts present, tight and correctly specified.
- Bracing that has been removed to gain access — a frequent and serious finding.
6. Loading and use
- Load overhang beyond the last arm in the run.
- Loads bearing on one arm rather than distributed across the intended number of arms.
- Load notices present, legible and matching the current arm configuration.
- Column guards and end protection where MHE traffic passes the column line.
Damage tolerances and classification
Cantilever findings are reported against the same measurable SEMA tolerances and the same red, amber and green classification used across every Rackstor inspection.
| Component / measurement | SEMA tolerance |
|---|---|
| Upright frontal (cross-aisle) deflection | Max 3mm over a 1m gauge |
| Upright lateral (down-aisle) deflection | Max 5mm over a 1m gauge |
| Bracing member deflection | Max 10mm |
| Beam deflection under load | Max Span / 200 |
| Beam residual deformation (unloaded) | Max Span / 1000 |
- Green — within tolerance. No action; re-checked at the next weekly walk-round.
- Amber — repair within a set timeframe, commonly four weeks, with the load reduced meanwhile.
- Red — unload the bay and take it out of use immediately until repaired or replaced.
Where we inspect cantilever racking
Cantilever rarely stands alone. It usually sits alongside selective pallet racking and long-span shelving on sites that grew in stages, and it is inspected on the same visit. Typical installations we cover include:
- Automotive parts operations — exhausts, trim, body panels, bumpers and windscreens that do not fit pallet racking, often stored on cantilever, A-frames and long-span shelving together.
- Manufacturing sites storing bar, tube, sheet and extruded profile alongside selective racking for finished goods.
- Timber and builders' merchants handling long lengths and sheet material with high MHE traffic at the column line.
- Energy and offshore supply chains handling long, heavy and irregular loads, where bespoke and combination racking is common.
For how cantilever compares with the other systems we inspect, see the pallet racking types guide.
Cantilever inspection FAQs
Is cantilever racking inspected differently from pallet racking?
Yes. Cantilever racking fails differently because the load is applied at the end of an arm rather than across a pair of beams. That produces a large overturning moment at the column base, so the critical checks are arm deflection and arm-to-column connection integrity, column plumb and straightness, base and floor-fixing condition, and the tie-bracing between columns. The statutory framework is the same — PUWER 1998 and HSG76 — but the inspection methodology is not.
How often should cantilever racking be inspected?
The same regime as any other racking: an expert inspection by a technically competent person at least once every 12 months under HSG76, weekly documented visual checks by your nominated PRRS, and immediate reporting of any impact. Sites handling long, heavy or irregular loads often shorten the expert interval where impact rates are high.
Why do floor fixings matter more on cantilever racking?
A cantilever column resists the overturning moment created by the load on its arms through its base and floor fixings. On a pallet racking frame that moment is much smaller and is shared between two uprights and the bracing. So cracked slab around anchors, lifted baseplates and elongated fixing holes go straight to the top of the priority list on a cantilever installation, where on pallet racking they would be one finding among several.
What damage classification is used on a cantilever inspection?
The same SEMA red, amber and green system. Green means damage within tolerance and no action. Amber means repair within a set timeframe, commonly four weeks, with the load reduced meanwhile. Red means unload the affected bay and take it out of use immediately until the component is repaired or replaced to the manufacturer's specification.
What is checked on cantilever arms specifically?
Arm deflection under load and whether the arm returns straight when unloaded; the arm-to-column connection, including cracked welds, sheared or worn locating teeth and missing arm locking pins; arm level and any drooping; and load overhang beyond the last arm in the run, which is a common cause of instability rather than a component defect.
Do you inspect cantilever racking alongside pallet racking on the same visit?
Yes, and it is usually the sensible way to do it. Manufacturing and automotive sites in particular run selective pallet racking, cantilever for bar, sheet and long goods, and long-span shelving side by side. One SARI accredited inspector covers all of it on the same visit and reports it in one document.
Book a cantilever racking inspection
One SARI accredited inspector, all your storage systems, one written report inside 48 hours. Tell us your site postcode and roughly what you have — cantilever runs, pallet racking bays, shelving — and we'll come back with a fixed price, usually the same day.