Reading a Pallet: Common Defects and What They Cost You

Every used pallet tells its history if you know how to read it. The scuffs, the plugged blocks, the slightly cupped deck boards — none of that is failure, it's honest wear. Real defects are different: they are the flaws that shorten a pallet's life, damage the freight riding on it, or hurt the person handling it. This is a field guide to the six that matter most, and to what each one actually costs when it slips through.

Cracked and broken stringers

The stringers are the load-bearing spine of a stringer-class pallet — the three parallel boards running the length of the unit. When one cracks, the whole platform loses stiffness, and a fork tine entering the notch on that side finds nothing solid to lift against. The classic failure is a crack radiating from the fork entry notch, where the wood is already thinnest.

A short split near the end of a stringer is often repairable with a companion board nailed alongside — a repair we cover in the pallet repair techniques piece. A crack that runs through both fork notches, or splits the stringer in half lengthwise, sends the pallet to teardown. The cost of missing this one is the worst kind: a load that drops in transit, or a tine that punches through and topples product.

Missing, split and shattered deck boards

Deck boards carry the load and set the pallet's cosmetic grade. A single missing lead board (the outer top board that takes the first hit from a fork) is a fast, cheap fix. A missing interior board changes the story — it enlarges the gaps your product bridges, and small cartons or drums start sagging or catching.

• Missing lead deck board — cosmetic and fixable; drops the pallet to a repairable B until re-boarded.
• Split deck board — a lengthwise split still spans the gap but will fail under point load; replace before it does.
• Shattered board — splinters and jagged edges snag film wrap and slice hands; pull it immediately.
• Excessive gapping — boards spaced too wide for the freight will crush cartons regardless of board condition.

Deck-board defects are the single most common reason a pallet drops from Grade A to Grade B on our grades reference. Most are honest, harmless repairs. The dangerous ones are the splits you can't see because the board looks intact from the top.

Protruding and backed-out nails

Fasteners are supposed to disappear into the wood. When a nail head stands proud, or a shank works its way back out the bottom, you have three problems at once: a snag hazard for hands and film, a scratch hazard for product, and a signal that the joint it was holding has loosened.

“A backed-out nail is never just a nail — it's the pallet telling you a joint has already started to let go.”

Protruding fasteners are why gloves are non-negotiable on any pallet line, and why we run every repaired unit past a clinching or set step. The fix is quick — reset or replace the fastener with a proper ring-shank or helically threaded nail that grips and stays put. The cost of ignoring it is torn shrink wrap, gouged cartons, and the occasional trip to the first-aid kit.

Delamination in plywood and composite decks

Solid-lumber pallets don't delaminate, but plywood-top and engineered-panel pallets do. Delamination is the plies of the panel separating — usually from repeated moisture cycling or a manufacturing bond that never fully cured. You'll see it as a lifted, bubbled or peeling surface layer, and you'll feel it as a soft, spongy spot underfoot.

A delaminated panel has lost most of its rated strength even when it looks whole, which makes this defect especially sneaky. There's no partial repair worth doing — the panel comes off and gets replaced, or the pallet is retired. It's one more reason we favor solid reclaimed lumber for most builds; it fails visibly and slowly, not invisibly and all at once.

Wane: the edge that was never fully there

Wane is the bark edge or rounded corner left on a board when it was milled too close to the outside of the log. It looks like a beveled or missing edge, sometimes with bark still clinging on. A little wane on a non-structural board is cosmetic. Wane on a lead deck board or a stringer edge is a strength defect — there's simply less wood there than the design assumed.

Wane matters most on export and food flows, where it can harbor bark, pests and moisture. On a domestic B-grade workhorse, minor wane is tolerable. On anything headed abroad under ISPM-15, inspectors look hard at it, because bark is exactly what phytosanitary rules are written to exclude.

Mold, rot and moisture staining

This is the defect that gets people worried, and rightly so — but it's also the most misunderstood. Surface mold is a cosmetic and cleanliness issue that grows on wet wood; it does not necessarily mean the wood has lost strength. Rot is different: it's fungal decay that has actually eaten into the fiber, leaving wood that crumbles or dents under a thumbnail.

1. 1Blue stain or surface mold — cosmetic; a symptom of storage that was too wet. Kiln-drying and dry storage prevent it.
2. 2Water staining — grey or black tide-lines; usually harmless but a warning the pallet has been sitting in the wet.
3. 3Soft rot — wood that gives under pressure has lost structural value and belongs at teardown.
4. 4Deep decay — spongy, discolored wood near ground-contact areas; retire the pallet, don't ship on it.

For food, pharma and any hygiene-sensitive flow, even cosmetic mold is a disqualifier — see the food-grade considerations piece for why. The prevention is boring but total: keep pallets dry. Most mold we see arrives on pallets that were stacked outdoors, uncovered, on bare ground.

Turning defects into a grade

None of these defects exist in isolation. A grader adds them up: cosmetic issues nudge a pallet down a tier, structural issues send it to repair or teardown, and hygiene issues pull it out of sensitive flows entirely. The whole point of grading is to price that risk honestly so you're never surprised by what a pallet can and can't do.

Sound wood that a grader pulls always has a next life. A cracked stringer becomes a deck board donor; a mold-stained but solid pallet becomes domestic B-grade stock; genuinely spent fiber heads to our recycling line for mulch or biomass rather than a landfill. Reading defects well isn't about rejecting pallets — it's about routing each one to the job it can still do safely.

Not sure how to grade your own returns? Send photos through any form on the site and our yard crew will walk you through what we see. Learning to read a pallet is the cheapest quality-control tool you'll ever pick up.