Dunnage and Load Bracing: The Unsung Heroes of Safe Freight

You can buy the best pallet in the yard, load it perfectly, and still lose the shipment if the freight shifts in transit. A trailer accelerates, brakes, corners and hits potholes; a container rolls and pitches at sea. Anything not locked down moves, and moving freight crushes, topples and punctures itself. Dunnage and bracing are the humble, unglamorous answer — and they're the difference between freight that arrives and freight that arrives as a claim.

Dunnage versus bracing: two different jobs

People use the terms interchangeably, but they do distinct jobs. Dunnage is the material you place around, under and between freight — it fills voids, cushions, separates and supports. Bracing (and blocking) is the structure you add to physically stop freight from moving — it takes the load's momentum and transfers it into the trailer walls, floor or other freight. You almost always need both: dunnage to fill and cushion, bracing to lock.

The common types of dunnage

Dunnage comes in many forms, and the right choice depends on the freight, the value, and whether you'll ever see the material again.

• Reclaimed lumber — cut-to-fit boards and blocks for filling voids and building supports; cheap, strong and endlessly reusable.
• Airbags (dunnage bags) — inflatable bladders that fill the gap between loads and expand to lock them; fast and reusable.
• Corner boards and edge protectors — stop strapping from crushing carton edges and keep stacks square.
• Foam and molded inserts — for high-value, shock-sensitive product that needs cushioning, not just blocking.
• Kraft paper and honeycomb — lightweight void fill for lighter freight.

For most industrial and B2B freight, reclaimed lumber is the workhorse. It's the same material a pallet is made of, it cuts to any dimension on the spot, and at end of life it feeds right back into our recycling line rather than the trash.

Blocking and bracing methods

Blocking stops a load from sliding; bracing stops it from tipping or racking. The methods range from a few nailed boards to engineered systems, and you scale up with the weight and value of the freight.

1. 1Floor blocking — lumber nailed to the trailer floor (where permitted) to box a pallet in against sliding.
2. 2Cross-bracing — boards spanning between loads or trailer walls to stop fore-and-aft movement.
3. 3Void fill — dunnage or airbags eliminating the empty space loads slide into.
4. 4Load bars and straps — adjustable bars and ratchet straps that clamp freight against walls or each other.
5. 5Stretch wrap and banding — unitizing the load so it moves as one mass, not a stack of loose pieces.

“Freight doesn't get damaged sitting still — it gets damaged in the inches it's allowed to move.”

How freight actually fails in transit

Understanding the forces makes the fix obvious. In over-the-road freight, hard braking throws loads forward, acceleration throws them back, and cornering throws them sideways — and it's the forward throw from braking that causes the most damage, because it's the most violent and frequent. In containers at sea, the motion is slower but relentless, working loose anything that isn't fully locked.

The failure modes are predictable: a load slides into a void and topples, a stack leans until the bottom cartons crush, or a heavy item punches into a lighter neighbor. Every one of these traces back to a gap that should have been filled or a movement that should have been blocked. The right pallet keeps the base stable; dunnage and bracing keep everything above it stable too, which is why we treat them as one system in the reduce product damage piece.

Why reclaimed lumber is the smart dunnage

Dunnage lumber is a perfect use for reclaimed wood, and a bit of a secret weapon on cost. Blocking and bracing boards don't need to be pretty — they need to be strong, and they usually get consumed or discarded at the destination. Buying new lumber to cut up and potentially throw away is exactly backward. Reclaimed boards and torn-down pallet components do the identical job for a fraction of the price and a fraction of the carbon.

We keep a steady supply of dunnage-grade reclaimed lumber and offcuts precisely because our teardown line produces so much sound, usable wood that doesn't quite make grade for a pallet deck but is perfect for bracing. It's on the accessories page alongside airbags, corner boards and load bars. Buying dunnage reclaimed closes the loop: yesterday's broken pallet braces today's shipment.

Getting your loads secured right

Good securement is a discipline, not a product. Load heaviest and densest low and centered, fill every void, block against forward motion first, unitize each pallet so it moves as one, and inspect the finished load before the doors close. Freight that can't move can't break itself.

If you're seeing damage claims and can't pin down where the freight is failing, it's often the bracing, not the pallet. We help operations we serve dial in both, and our logistics team can coordinate the reclaimed dunnage supply alongside your pallet program. Send us a photo of a typical loaded trailer and we'll usually spot the gap that's costing you — it's almost always a void that never got filled.