Lumber warping on the floor, pipes rolling loose, sheet goods getting dinged in standard shelving. These are exactly the problems standard pallet racking was never built to solve. Cantilever racking removes the front columns that get in the way of long material, opening up access that no other storage system can match.

At Accurate Shelving, this guide breaks down how cantilever racking works, how to choose the right configuration, and what makes it genuinely different from anything else in a warehouse.

What Is Cantilever Racking and How Is It Different from Pallet Racking?

Before getting into configuration choices, it helps to understand exactly what sets this system apart structurally.

No front columns means no obstruction

Unlike pallet racking, cantilever systems have no vertical posts on the load-facing side, leaving arms extending from a central column completely open for material of almost any length.

Built for length, not pallets

The system handles lumber, pipe, steel bar stock, and sheet goods at densities that floor stacking or standard racking simply can’t match, without the constraints of pallet dimensions dictating how material gets stored.

What Are the Main Components of a Cantilever Racking System?

Once the basic concept is clear, the actual structure comes down to a handful of parts working together.

Uprights, base, and arms form the core structure

A vertical upright column bolted to a horizontal base carries the arms that extend outward, with cross braces connecting uprights for lateral stability across an entire row.

Structural vs. roll-formed construction changes what it can hold

Structural steel components handle heavier, more demanding loads like steel bar stock, while roll-formed systems suit lighter applications like furniture or trim storage where the weight simply doesn’t call for the heavier build.

Should You Choose Straight or Inclined Arms?

This is usually the first real configuration decision, and it comes down entirely to how the material behaves once it’s sitting on the arm.

Straight arms suit stable, non-rolling materials

Lumber, plywood, and sheet goods stay put on a flat arm, making straight arms the right choice whenever the material won’t shift or roll on its own under normal handling.

Inclined arms keep round material from rolling off

Pipe, tubing, and other cylindrical stock get a pitched arm angle instead, along with optional end lips, specifically to stop material from sliding forward under its own weight over time.

How Is Cantilever Rack Capacity Actually Calculated?

Capacity on a cantilever system isn’t a single number pulled off a spec sheet. It’s a relationship between three separate ratings.

Capacity is really three ratings, not one

Arm capacity, column capacity, and base capacity all have to hold simultaneously, since an arm rated for a given weight is only safe if the column and base underneath it can handle the cumulative load of every arm combined.

Longer arms and wider column spacing both reduce capacity

Capacity decreases as arm length increases, and spacing columns too far apart raises the risk of sag near the midpoint between them, which is why proper spacing directly protects both the rack and the material resting on it.

Should You Choose Single-Sided or Double-Sided Cantilever Racking?

Layout matters just as much as arm selection, and this decision usually comes down to where the rack actually sits in the building.

Single-sided racks work best against a wall

With arms extending from only one face, single-sided systems fit naturally along a perimeter wall where floor space is already at a premium and full access from both sides isn’t needed.

Double-sided racks maximize an open aisle

Arms extend from both sides of the same upright, and because the loads on each side balance the forward force on the column, a well-loaded double-sided system is structurally more efficient than two single-sided rows placed back to back. That efficiency matters most when forklift access on both sides of the aisle is already part of the layout plan.

How Does Cantilever Racking Support Roof Structures and Fire Code Requirements?

Beyond storage capacity, cantilever racking does something few other systems can, and it comes down to how the structure itself is engineered.

The same columns that hold arms can support a roof

Because cantilever columns already carry significant structural load, the same uprights can be engineered to support a roof over the stored material, protecting it directly from weather without requiring a separate building structure.

Open column spacing keeps sprinkler coverage intact

The gaps between cantilever columns function as flue space, allowing water from an overhead sprinkler system to reach every level in a fire, the same principle that makes open racking preferable to solid storage under most fire codes.

Getting Cantilever Racking Right

Cantilever racking solves a problem pallet racking was never built for, giving long and oversized material the open access, capacity, and structural support it actually needs. Getting the configuration right, from arm type to single or double-sided layout, is really the same kind of planning decision behind good warehouse optimization more generally.

Accurate Shelving has spent over 21 years designing and installing cantilever racking systems across Canada, engineered around the real weight and length of what you’re storing. Visit us to learn more, or reach out through Contact Us for a hands-on assessment of the right cantilever configuration for your warehouse or yard.

Frequently Asked Questions

What’s the difference between cantilever racking and pallet racking? 

Cantilever racking has no vertical front posts, with arms extending openly from a central column, while pallet racking relies on front-facing uprights that box in each storage level.

When should I use inclined arms instead of straight arms? 

Inclined arms suit round or cylindrical material like pipe and tubing that could otherwise roll forward, while straight arms work well for stable material like lumber and sheet goods.

How is cantilever rack capacity determined? 

Capacity depends on three combined ratings the arm, the column, and the base, all of which must be engineered together, since overloading any one weakens the safety of the entire system.

Should I choose single-sided or double-sided cantilever racking? 

Single-sided racks fit well against a wall, while double-sided racks make better use of an open aisle and are structurally more efficient when loaded evenly on both sides.

Can cantilever racking support a roof over stored material? 

Yes, the structural columns can often be engineered to support a roof, protecting long material like lumber from weather exposure without a separate building.