Key takeaways
- Roughly nine out of ten containers that fail our grading fail in the bottom three inches of the side wall.
- Pallet overhang causes 38% of it, moisture wicking off concrete another 21%, fork tips 18%.
- The damage is invisible from above, which is why the photograph nobody sends is the one that decides the price.
- All four main causes are entirely or mostly avoidable, and none of the fixes cost meaningful money.
Turn a rejected gaylord over. In roughly nine cases out of ten the failure is in the bottom three inches of the side wall: crushed, rounded, abraded or soft. The top of that same box will usually look immaculate, which is precisely why the problem persists — the top is what everybody photographs.
Why the bottom edge carries everything
A corrugated bulk container is a column structure. Vertical load travels down the side walls through the flutes, which act like a great many small columns standing side by side, and exits into the deck below. The bottom edge is the joint where that load leaves the box, and it is the only part of the structure that is in contact with something hard, every single time the box is handled.
Crush that edge and you have not cosmetically damaged the box. You have removed part of the load path. The remaining board has to carry the same weight through less structure, and the failure that follows is sudden rather than gradual.
The four things that do the damage
1 · Pallet overhang
The most common cause by a wide margin. A 48 × 40 box on a pallet that actually measures 47½ × 39¾ overhangs at every corner. From then on, every lift transfers handling force into the unsupported bottom edge rather than into the deck. The pallet saved two dollars. It will cost you the box.
2 · Deck board gaps
On a pallet with five top deck boards carrying eighteen hundred pounds, the box base sags between the boards. Over enough cycles, that produces score lines in the bottom panel that eventually crack. Seven or more top deck boards is the practical answer above fifteen hundred pounds.
3 · Fork tips on side entry
Notched stringer pallets admit a fork cleanly from the ends and awkwardly from the sides. Side entry is where fork tips clip the bottom corner of the corrugated, and it produces a very recognisable triangular scuff that we see on inbound loads every week.
4 · Concrete
Concrete slabs wick moisture. A box set directly on a slab overnight takes water into the bottom course, and damp board at that exact location loses its compression strength where it can least afford to. A slip sheet costs pennies.
| Cause | Share of rejects | Avoidable? | Fix |
|---|---|---|---|
| Pallet overhang | 38% | Entirely | Match the pallet; measure it, do not trust the label |
| Moisture wicking from floor | 21% | Entirely | Slip sheet or pallet under everything |
| Fork tip contact | 18% | Mostly | Block pallets or standardised approach direction |
| Deck board sag | 12% | Entirely | Seven or more top boards on heavy loads |
| Impact and drops | 7% | Partly | Handling discipline |
| Other | 4% | — | — |
What this means when you are buying
Ask any supplier for a photograph of a bottom edge. Not the pallet, not the stack — one box, turned over, photographed from below the score line. It takes ten seconds and it tells you more about what is arriving than the other four photographs put together.
And when you are selling
If your empties are stacked on the concrete behind receiving, you are losing a grade. Not eventually — currently. Put them on pallets, keep them under a roof, and the same boxes that would have priced as 4A will price as 2A or 3A.
We have made that suggestion to customers who then sold the same stack for nearly twice what we had originally quoted, sometimes to somebody else. It remains the single highest-return five minutes of advice in this business.
Questions