Cantilever Racking vs Longspan Shelving vs Telescopic Cantilever Racking vs CTU Racking: Which Storage System Actually Fits Your Warehouse?
Most racking mistakes start the same way. Someone picks a system by looking at a catalogue, then finds out three months later that it doesn't match what's actually on the floor. Timber on a shelf. Cartons on arms. Totes in a system built for something else.
So before we get into specs, here's the one-line version of each. Four systems, four different jobs.
Cantilever Racking: long, rigid stock that won't sit on a normal shelf.
Longspan Shelving : boxed and irregular stock that needs a real shelf and gets picked by hand.
Telescopic Cantilever Racking: long stock again, but when the lengths change a lot.
CTU/ACR Racking: fast-moving cartons and totes, picked through a rack built for that handling method.
If your stock fits one of those sentences, you're most of the way there. The rest of this post is for the in-between cases, which are the ones that cost money when they go wrong.
We've covered cantilever, telescopic and CTU side by side before (read the earlier comparison). This one adds longspan shelving to the mix and ends with a checklist you can run against your own stock.
Cantilever Racking: For long, rigid loads
Picture a timber yard. Pipe lengths, steel bar, long sections of aluminium, sheet material stood on edge. That's cantilever territory.
A cantilever rack has uprights with arms sticking out the front (or both sides, in a double-sided setup). There's no front beam, which is the whole point. You can slide a six-metre length straight in with a forklift or a side loader and nothing gets in the way. Try that on pallet racking and you'll be threading product around beams all day.
Good fit: timber merchants, steel and pipe suppliers, building materials, anything long and stiff.
Not a good fit: loose cartons. They'll slide between arms. If most of your stock comes in boxes, keep reading.
One thing worth knowing: AS 4084 doesn't apply to cantilever racking the way it does to pallet racking. That doesn't mean "anything goes". It means you should ask your supplier for the rated capacity per arm and per upright, in writing, and plan inspections as part of normal running. Single-sided units suit a wall. Double-sided units suit the middle of the floor.
Longspan Shelving: For bulky cartons and awkward stock that needs a shelf
Longspan Shelving is the one that surprises people. It looks like simple shelving, and it is, but it's the right call for a lot of warehouses that assume they need pallet racking.
The system is beams and uprights with decking laid across, so you get a proper flat surface at each level. No arms, no pallet positions. That makes it a good home for boxed goods, totes, spare parts, trade stock and the odd-shaped items that don't pallet well. Stock gets hand-picked, and in the right configuration it can also be loaded by forklift.
If your team is walking the aisles and picking by hand all day, pallet racking is probably the wrong tool. You're paying for pallet positions you don't use and slowing the picker down.
Good fit: distribution centres, trade and wholesale, spare parts, e-commerce backrooms, workshop stores.
Not a good fit: anything long enough to hang off the front of the shelf. A three-metre length on a shelf is a safety problem, not a storage plan.
Telescopic Cantilever Racking: When one rack has to cover two jobs
Here's a situation we hear a lot. A business stocks a mix: some short lengths, some very long, often the same product in different cuts. They've been running a standard cantilever for the long stuff and something else for the short stuff, and neither is ever quite right.
Telescopic cantilever racking solves that by letting the arms extend or retract to suit the length of what's on them. Short loads sit on a short arm position. Long loads get the full reach. One system, instead of two.
The simple test: if your stock lengths vary a lot on the same line, telescopic usually wins. If everything is roughly the same length, standard cantilever does the job and keeps things simpler.
Good fit: mixed-length timber and pipe, fabrication shops, suppliers who stock the same material in several cuts.
Worth thinking about: a flexible system only stays flexible if the team actually adjusts it. Decide who owns that before it goes in.
CTU/ACR Racking: For fast-moving cartons and totes
CTU/ACR Racking is the odd one out here, so let's be precise about it. Everything above is about stock you store and pick by hand or by forklift. CTU racking is built for cartons and totes that move fast, handled in a more automated way.
What it isn't: gravity-fed. There's no roll-forward lane and no first-in-first-out flow from the back of the rack. Stock sits in set positions and is retrieved from them, so don't plan a layout around gravity flow, and don't let anyone describe it that way in a quote.
What it is good at: high pick rates on standard-sized cartons and totes, where speed and consistency matter more than flexibility.
Good fit: e-commerce fulfilment, FMCG distribution, retail replenishment, anything with lots of uniform containers and lots of picks per hour.
Not a good fit: mixed, irregular stock. If every second item is a different shape, CTU's strength turns into a constraint.
The checklist: run it against your own stock
Grab a pen. Answer these for your top ten products by volume, not for what you wish you stocked.
How long is it? If it's longer than your shelf depth by a lot, you're in cantilever territory. If it's all boxes, you're not.
Is it rigid? Pipe and timber, yes. Soft or loose items need a surface under them.
Do the lengths change? Mixed lengths on one line point to telescopic. Uniform lengths point to standard cantilever.
Who picks it? A person walking the aisle points to longspan. A forklift or side loader points to cantilever. Automated or high-speed carton and tote picking points to CTU.
How fast does it move? Slow-moving odds and ends are fine on longspan. Fast, uniform containers are where CTU earns its place.
Is it a standard container? Uniform cartons or totes suit CTU. Odd shapes don't.
Does it live indoors or outdoors? Cantilever is often used under cover outside, which changes finish and anchoring. Tell your supplier either way.
What happens in 18 months? If the range is likely to change, flexibility matters more than today's perfect fit.
If you landed on the same system for most answers, that's your starting point. If you got a mix, that's normal. Plenty of warehouses run two systems side by side, and that's fine, as long as each one is doing the job it's built for.
Want a second opinion on your list?
Send us your stock profile and a rough floor plan. We'll tell you honestly which system suits it better, including when the answer is "you don't need what you came in for". The layout consultation is free, there's no obligation to proceed, and stock is held at our Dandenong South warehouse.
Call 03 8766 9072, email info@chracking.com.au, or use the contact page.
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CH Racking & Displays, 10-16 Evolution Drive, Dandenong South VIC 3175. Supplying warehouses across Australia and New Zealand.