pallet overhang compression loss is a real packaging problem because corrugated boxes perform best when their corners and edges are properly supported. NMFTA guidance recommends stacking boxes squarely on the pallet with no overhang, citing damage and safety risks.
Overhang also interacts with the broader issue of stacking alignment. FBA research shows that misaligned pallet patterns can significantly reduce top-to-bottom compression performance even without focusing solely on overhang.
Why overhang damages load performance
| Problem | Potential result |
|---|---|
| Unsupported box edge | Reduced ability to carry vertical load |
| Exposed carton | Higher impact and puncture risk |
| Misalignment | Compression force moves away from strongest corners |
| Irregular footprint | Worse unitization and handling stability |
| LTL handling | Greater damage exposure through terminals and cross-docks |
NMFTA’s practical guidance is simple: no overhang
NMFTA says cartons should be stacked squarely on the pallet, corners aligned, and that there should be no overhang. If the freight footprint exceeds a standard pallet, using an appropriately larger pallet can be safer than allowing the load to extend beyond the deck.
Our pallet overhang vs underhang guide covers the geometric trade-off in more detail.
Alignment also affects compression
FBA pallet-pattern research found meaningful compression losses for columnar misalignment, hybrid and interlocked patterns compared with aligned conditions. This reinforces a key lesson: box grade and pallet pattern must be designed together.
Use the cartons per pallet calculator to test a footprint before approving a carton change.
Fix the package or fix the pallet?
If a carton footprint does not fit cleanly, compare three options: change carton dimensions, change pallet size, or redesign the pallet pattern. The best solution depends on product protection, warehouse standards, transport equipment and unit economics.
Do not solve overhang simply by buying stronger corrugated board; unsupported geometry can still waste that extra strength.
Practical checklist
- Measure the finished carton, not nominal product size.
- Use a pallet footprint that fully supports the load.
- Align corners wherever practical.
- Test unit-load stability after any carton-size change.
- Review LTL carrier packaging requirements.
Frequently asked questions
How much pallet overhang is acceptable?
NMFTA guidance recommends no overhang for boxed LTL freight.
Why does overhang weaken boxes?
It leaves parts of the corrugated footprint unsupported and moves load away from strong vertical edges/corners.
Can stronger boxes solve overhang?
Stronger board may add margin, but it does not correct poor support or pallet geometry.
What should I do if products are larger than a standard pallet?
Evaluate a larger pallet or another engineered unitization solution rather than accepting uncontrolled overhang.
References
See NMFTA’s LTL Freight Packaging Guidelines and Fibre Box Association pallet-pattern research.
PackToolbox guides are built around stated formulas, practical examples and source checks for changeable carrier, freight and logistics rules. Calculators are planning aids; final requirements should be verified with the relevant carrier or service provider.