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Stacking safety / load path / Agrack
The stack looks simple, but the force path is not. On Agrack, the vertical load is designed to travel through the Q235 uprights and cup feet, while the glass stays inside a protected contact zone, not a structural one.
If your warehouse team is asking whether a three-high stack is safe, the first question is not the glass thickness. The first question is where the force goes. On a properly designed Agrack stack, the answer is straight down through the steel frame: from the upper unit into the cup feet, into the mating upright top, and then into the floor. The glass sheets sit behind EPDM protection strips and within the rack geometry, but they are not asked to carry the vertical stack load.
That distinction matters because a safe stack is a load-path problem, not a visual problem. A rack can look stable and still be wrong if the contact points are soft, misaligned, or not locked. The opposite is also true: when the cup feet seat cleanly, the uprights align, and the handling route is controlled, the stack becomes a structural system instead of a loose pile of frames.
Why the load belongs to the uprights, not the glass
The image below shows the rack in a loaded stacking state. What matters is the geometry: the upper frame does not sit on the glass edge, and the stack does not depend on friction alone. The vertical force is transferred through the steel columns, while the glass is isolated by the support layout and the protective buffer zone. This is why Agrack can be specified for warehouse handling without turning the glass itself into the load-bearing element. The rack structure is built around Q235 carbon steel, hot-dip galvanizing, and mechanically fixed EPDM protection strips, so the contact interface is defined and repeatable rather than improvised on site.
Why three-high is sometimes right, and sometimes too much
Three-high stacking is a choice inside a load envelope, not a universal rule. On lighter packs with controlled floor conditions and clean forklift access, a full three-layer layout can improve warehouse density. When the load becomes heavier, the sheet size grows, or the site has tighter movement lanes, two-high is often the better answer. The product profile for Agrack is built around that reality: the rack is designed for 1500 kg dynamic load and 4500 kg static load, but the actual stack height still depends on the specific glass package, handling method, and floor condition.
In other words, the correct logic is not “always three-high.” The correct logic is “use the highest safe stack that matches the load, then step down when the package or site demands it.” That is why the same rack family can support a full loaded stack in one application and a more conservative two-high arrangement in another. The choice is governed by stability, not by habit.
What the cup feet and upright stops are actually doing
This real warehouse image makes the alignment point easier to see. The upper rack sits into the lower rack through the stacking interface, so the cup feet and upright top act like a mechanical stop, not like a soft cushion. That stop prevents lateral wandering and keeps the vertical force path centered. The result is simple: the stack is guided into place, the load travels downward, and the glass remains inside a controlled protective frame.
For safety teams, the practical boundary is clear. Do not treat the safety pin, stop block, or stacking interface as decoration. Do not remove limiting features to gain a little extra clearance. If the stack does not lock cleanly, the stack height should be reduced or the load should be reconfigured. The rack is meant to be used within its envelope, not forced beyond it.
What to confirm before you choose the stack height
- Load per rack: confirm the glass bundle weight and choose a stack height that stays inside the 1500 kg dynamic / 4500 kg static design envelope.
- Interface lock: verify that the cup feet fully seat on the upright tops and that the stop points are intact before any stacking move.
- Handling route: confirm forklift pocket access, turning space, and floor flatness so the rack is not being twisted during placement.
- Return flow: if empty return volume is the issue, fold and nest the racks instead of over-stacking loaded units beyond the safe limit.