Pallet Stacking

Managing Load Safety in Warehouses

When we talk to warehouse managers and logistics teams across Australia and New Zealand, one challenge comes up repeatedly: how do we keep goods stable as we stack them higher to make the most of limited storage space? Pallet stacking sits at the heart of that conversation. It’s not just about squeezing more SKUs into a facility—it’s about doing it safely and knowing your load will stay intact through handling, transit, and storage.

At Ferrier Industrial, we’ve worked with teams in postal networks, logistics hubs, and heavy industry operations long enough to recognise that pallet stacking depends on more than just stacking height or clever nesting strategies. The real issue is matching the right pallet quality, dunnage material, and restraint approach to your specific operation. Get it right, and you gain throughput and safety. Get it wrong, and you’re managing collapse claims, damaged stock, and labour injuries. That’s a conversation worth having early, not after something goes wrong.

This guide walks through the practical realities of pallet stacking—how to evaluate your needs, choose the right materials, and build a system that works reliably day after day. We’ll focus on how dunnage, load restraint, and pallet selection fit together, and how to keep your operation both efficient and secure.

Background: The Challenge of Stable Stacking

Warehouses operate under constant pressure. Space costs money, and every cubic metre you don’t use is lost revenue. That pressure drives taller stacks. But height without stability creates risk—risk to staff, to goods, and to your operation’s reputation.

The fundamentals haven’t changed much. When goods sit on a pallet and another pallet sits on top, load distribution matters immediately. Uneven weight, shifting during forklift movement, vibration during transport, or moisture from the warehouse floor—each of these factors affects how long your stack holds together. High-traffic facilities compound the problem. Every time a load moves, the stack flex slightly. Repeat that a hundred times, and small movements become big problems.

Many teams approach this reactively. They stack until they see instability, then they add restraint or change materials. We’ve found that starting with the right foundation saves time and prevents expensive mistakes. That foundation includes understanding pallet integrity, selecting appropriate dunnage, and planning your storage layout with load distribution in mind.

Facilities often overlook one crucial reality: your stack is only as good as your weakest pallet. A single compromised or warped pallet buried three levels deep can trigger a cascade of problems. Similarly, the surface friction between pallets matters far more than most operators realise. A smooth plastic pallet stacked on another smooth plastic pallet behaves completely differently from a wooden pallet with a high-friction dunnage layer. Those differences drive everything—stability, safety, and how high you can actually stack without risk.

We also see teams make sizing decisions without checking equipment compatibility. If your forklift pockets don’t align with your pallet deck, or your racking footprint doesn’t match your pallet span, you’ve created a hidden instability that no amount of restraint will solve. These details matter when you’re designing a system meant to run for years without incident.

Services & Solutions: Load Restraint and Pallet Foundations

At Ferrier Industrial, we approach pallet stacking as part of a broader load restraint and storage system. Our portfolio includes the core elements that make stacking work: pallet manufacture and supply, high-friction dunnage materials, load-restraint systems, and storage infrastructure.

Pallets form the foundation. We supply wooden pallets engineered for high-cycle use—rackable, heat-treated, and sustainable. Many operations underestimate pallet condition as a stability factor. A pallet warped or splintered from rough handling doesn’t provide the flat, even surface needed for confident stacking. We work with operators to specify pallets matched to their load weights, handling equipment, and storage duration.

LVL high-friction dunnage is where surface friction becomes a real tool. Engineered from laminated veneer lumber with vulcanised rubber lining, this material is designed specifically to prevent load slip during stacking and transport. When you place LVL dunnage between pallet levels, you’re not just spacing them—you’re creating friction that holds each load in place. This is particularly valuable in high-density storage or during intermodal movement where vibration and handling introduce forces that would normally shift a load.

Truck cradles and storage cradles provide support tailored to specific load shapes. For round or cylindrical goods stacked in storage, cradles distribute weight across a wider footprint, reducing pressure points that can deform products or cause stack sway. For rectangular palletised goods, they maintain spacing and prevent nesting—a common cause of stack collapse.

Load-restraint systems including rubber mats, ratchet straps, and restraint hardware become relevant when stacking in dynamic environments—warehouses with frequent movement, facilities near transport hubs, or operations involving intermodal handoff. These systems prevent lateral shift and creep during handling.

Core Solutions We Supply for Pallet Stacking Operations

Engineered wooden pallets (heat-treated, rackable, sized to lift-truck pocket and racking span) suitable for high-cycle storage and transport
LVL dunnage with vulcanised rubber lining (multiple dimensions and grades) to provide high-friction surfaces between pallet levels and control load slip
Truck and storage cradles (custom-sized, vulcanised rubber bonded to steel) to stabilise non-rectangular or high-value loads during stacking and handling
Load-restraint mats and straps (high-µs rubber, polyester webbing, DOT-compliant) for securing stacks in transit or addressing stability in mobile warehouse environments

Choosing the Right Stack Foundation

A common starting point is understanding your load profile. What are you actually stacking? How much does each pallet weigh? What’s the footprint? Is the load stable on its own, or does it need internal bracing? These questions sound basic, but they drive every decision downstream.

At Ferrier Industrial, we begin with a practical assessment. We look at your warehouse floor condition—wet, dry, temperature-controlled, or exposed to weather. Floor moisture creeping up from concrete can soften pallet stringers and degrade adhesive bonds. It’s not glamorous, but it’s real. We also map your equipment: What forklifts do you use? What’s their pocket width? Are you using conventional or powered pallet jacks? Are you moving goods through racking systems, or is it open floor stacking?

Once we understand the environment, we recommend a pallet type. Standard wooden pallets work well for many operations. Engineered wooden pallets—our preference for high-cycle facilities—offer greater consistency and longer service life. The extra durability in the stringers and deck boards means fewer failures over time, and that translates to fewer surprises when goods are several levels high.

Surface finish matters more than most teams expect. A new wooden pallet provides decent grip. But as it ages, weathering can smooth the surface. Stacking on a smoothed deck reduces friction. That’s one reason dunnage becomes important. High-friction rubber creates a brake between levels. It costs more per pallet, but it cuts collapse risk substantially, especially in stacks taller than a few levels.

Stack height decisions should be driven by three factors: load weight, pallet strength, and equipment reach. You can technically stack higher than your forklift safely reaches, which means goods at the top sit inaccessible until something breaks. We recommend staying within forklift height to keep everything accessible and manageable. In practical terms, that usually means four to five pallets high in standard warehouses, though operations with engineered racking and lighter loads sometimes go higher.

One detail many operations miss: stack geometry. A stack of identical rectangular pallets stacked neatly is stable. A stack with varying pallet sizes, or goods that overhang one side, creates uneven weight distribution. The load wants to tip toward the heavier side. Add vibration from nearby machinery or the movement of adjacent stacks, and you’ve created instability that no restraint can fully control. Plan your stack layout on paper before you build it in the warehouse.

Dunnage, Friction, and Load Stability During Stacking

Dunnage is one of those terms that can mean different things in different contexts. In a stacking scenario, dunnage refers to the material placed between pallet levels to separate them, provide cushioning, and critically, create friction to prevent load slip.

We supply LVL high-friction dunnage specifically for this application. It comes in engineered dimensions matched to common pallet spans—typically 50 × 100 mm or 75 × 75 mm cross-sections, in lengths ranging from 1,200 to 1,450 mm depending on your pallet width. The vulcanised rubber lining bonded to the timber provides a friction coefficient above 0.60, which is genuinely high for load restraint applications. That friction prevents lateral shift during forklift movements, prevents goods from creeping sideways during storage, and reduces the risk of load overhang or tilt.

Many teams assume solid stacking contact is enough—pallets touching pallets. But there’s a difference between resting on each other and being held in place. When you introduce a dunnage layer with high-friction rubber, you’re adding a mechanical lock that resists any motion except vertical compression. This is particularly valuable in facilities with vibration (from machinery, vehicle traffic nearby) or in operations where goods move regularly.

Dunnage placement is straightforward but critical. Place each dunnage beam perpendicular to the pallet stringers below it. This creates a stable base for the next pallet tier. Some operations use two beams per level (one at each end of the pallet); others use three (end and centre) for wider loads. The spacing between beams affects how much the pallet can sag under load. Wider spacing requires a thicker pallet deck. Tighter spacing supports lighter pallet decks.

One practical consideration: dunnage adds height. If you’re trying to maximise stack height in a facility with a fixed ceiling, every layer of dunnage costs you one less level of goods. That’s a trade-off worth discussing openly. In most cases, the safety and stability gained from dunnage far outweigh the loss of one level’s worth of capacity. But it’s a business decision, not just an engineering one.

Handling and Restraint: Moving Stacks Safely

Pallet stacking doesn’t happen in isolation. Goods move from dock to storage, from storage to picking, and from picking to dispatch. Each movement introduces forces that test your stack stability. Forklift acceleration, deceleration, and turning all create lateral forces. Quick movements generate vibration. Uneven floor surfaces cause rocking. A stable stack on the floor isn’t automatically stable during movement.

Load restraint systems enter the picture when movement is frequent or when the operation involves intermodal transport—moving stacks from warehouse to truck to distribution hub to customer. Rubber mats placed under the pallet provide friction between the pallet and the truck bed. Ratchet straps or restraint bars prevent lateral shift during transit. These are often considered afterthoughts, but for operations moving goods regularly, they’re foundation-level decisions.

In our experience working with logistics teams, the difference between a stable stack during storage and a stable stack during movement comes down to planning. If you’re building a stack meant to sit in one place, friction dunnage and good pallet quality are sufficient. If you’re building a stack meant to move, you need to think about restraint from the start. How will goods be secured to the pallet? Will pallets be banded together? Will they be strapped to a vehicle? These decisions shape how you configure your stack itself.

Key Factors for Selecting Pallet Stacking Systems

Pallet quality and condition — engineered wooden pallets over standard pallets for high-cycle operations, with consistent dimensions to ensure level surfaces
Friction control — high-friction dunnage with vulcanised rubber lining to prevent load slip, particularly during handling and in vibration-prone environments
Load weight distribution — even loading across all pallets in a stack, with attention to overhang and geometry to avoid tipping forces
Stack height planning — height determined by load weight, forklift reach, storage ceiling, and equipment compatibility rather than arbitrary maximisation
Restraint and movement — additional load-restraint systems (mats, straps, cradles) specified if stacks move frequently or enter transport environments

Implementation: Building and Managing Your Stacking System

When a team at Ferrier Industrial works with operators to implement a pallet stacking solution, we follow a structured approach. We start with a site visit—understanding your current system, observing how loads move, checking equipment condition, and talking to warehouse staff about what works and what causes headaches.

From there, we develop recommendations. These aren’t generic. They’re specific to your facility, your load profile, your equipment, and your budget. We might specify particular pallet dimensions, recommend dunnage placement intervals, suggest cradles for specific loads, and outline a simple QA checklist for your team to monitor stack integrity over time.

We also prepare your team for transition. If you’re moving from non-friction dunnage to high-friction LVL, or from standard pallets to engineered pallets, staff need to understand why. We provide brief training on inspection points—what to look for when you assess whether a pallet is still suitable for stacking, how to place dunnage correctly, and what signs suggest a stack is becoming unstable.

Spares planning is often overlooked. If a pallet becomes damaged or warped during use, you want a replacement immediately, not a week later. We maintain supply relationships that let us deliver replacement pallets and dunnage quickly—often through consignment stock arrangements where we hold inventory at or near your facility.

Our Auckland and NSW operations give us flexibility in supporting both Australian and New Zealand teams. For facilities with complex requirements, we also custom-build solutions—engineered pallets to non-standard dimensions, cradles designed around your specific load geometry, or restraint systems integrated with your existing racking.

Practical Steps for Evaluating Your Current Stacking System

Taking stock of your pallet stacking operation doesn’t require a complete overhaul. Start with basics.

First, audit your pallets. Walk through your storage area and visually inspect pallet condition. Look for warping, splintered wood, cracked stringers, or loose nails. If a pallet looks questionable, it probably is. Replace it. A single bad pallet in a tall stack is a liability waiting to happen.

Next, measure your stack height and observe movement. When goods are stacked, can you still access them with your forklift? Are stacks near their safe limit for your equipment and load weight, or is there room to work within clear safety margins? If goods are stacked so high that they’re hard to retrieve, consider that a signal to revisit your stack geometry.

Assess your friction situation. Are pallets currently stacking directly on each other, or are you using any form of dunnage or spacing material? If it’s direct contact, observe whether goods shift during handling. Any lateral movement, creep, or instability during forklift operations suggests friction control would help.

Check your equipment and layout. Ensure forklift pockets align with your pallet stringers. Ensure aisle widths and racking dimensions don’t force awkward handling angles. Awkward handling often masks underlying instability in stacks.

Develop a simple inspection routine. Once you’ve optimised your system, a basic monthly check keeps it working. One person walking the stacks, looking for visible signs of trouble, takes a few minutes and catches problems early.

Building a Sustainable Pallet Stacking Workflow

Establish a pallet acceptance standard — define minimum condition requirements (no deep cracks, warping below threshold, stringers intact) and retire pallets that fall below standard before they’re stacked
Document dunnage placement patterns — create simple diagrams showing where dunnage goes, spacing intervals, and beam orientation for your most common loads so staff follow a consistent approach
Schedule quarterly pallet assessments — rotate through your storage areas checking stack integrity, pallet condition, and dunnage effectiveness, using results to inform replacement and repair priorities
Maintain spares inventory — keep replacement pallets and dunnage material on hand to address damage immediately rather than working with compromised stacks while waiting for orders

Sustainability and Long-Term Value in Pallet Systems

Pallet stacking systems should be built for durability and lifecycle value, not just cost minimisation. This perspective changes decisions.

High-quality engineered wooden pallets cost more upfront than standard pallets, but they last longer, perform more reliably, and reduce the frequency of failures. Over a five-year cycle, the cost per use typically favours engineered pallets. Similarly, high-friction dunnage lasts longer than cheap spacer blocks and delivers genuine safety benefits. These aren’t premium features—they’re practical economics.

At Ferrier Industrial, we also think about end-of-life. Wooden pallets can be repaired—broken stringers can be replaced, deck boards can be restaffed. We maintain relationships with recycling and refurbishment partners across Australia and New Zealand, so when pallets reach true end-of-life, they’re reclaimed for energy recovery or downgraded to lower-demand uses. That’s circular thinking in practice—not green marketing, just pragmatic resource management.

Dunnage materials follow similar logic. Well-maintained LVL dunnage stays functional for years. When it eventually needs replacement, the material can be chipped and recovered for animal bedding or energy purposes. Rubber lining can be separated and recycled. The whole system is designed with recovery in mind.

How We Support Your Pallet Stacking Operation

When we work with operators on pallet stacking, we’re thinking about your operation as a system, not just a product sale. Our discovery process includes understanding your volumes, your equipment, your facility constraints, and your safety and sustainability goals. From there, we design a pallet stacking approach that fits.

At Ferrier Industrial, we bring engineered solutions. We can specify off-the-shelf pallets and dunnage for straightforward applications, or we can custom-build if your load geometry or facility layout requires it. We’ve worked with postal networks, mining operations, construction material handlers, and food logistics teams—each with different stacking needs. That experience informs how we approach your challenge.

We also commit to ongoing support. Supply continuity matters. We maintain inventory across our Auckland and NSW facilities and work through consignment and JIT arrangements so you’re never short when a pallet needs replacement. We provide simple training to your team on inspection and best practices. And we stay available for questions as your operation evolves.

Our pallet stacking solutions reflect our broader philosophy: engineering-led problem solving, respect for operational constraints, and a focus on outcomes that matter—safety, durability, cost-in-use, and sustainability.

Starting Your Pallet Stacking Review

If you’re looking to optimise your pallet stacking, the first conversation is straightforward. Share details about your current setup: load weights, footprints, stack heights, storage layout, and equipment. Tell us about any stability issues you’re managing or goals you’re working toward—throughput, safety improvements, sustainability targets.

We’ll assess what’s working and where improvements fit. We’ll provide recommendations on pallet selection, dunnage, spacing, restraint systems, and handling practices. We’ll talk through trade-offs and options in plain terms. And we’ll offer samples, drawings, and a pilot plan so you can test approaches before full implementation.

Our team at Ferrier Industrial is ready to walk through this with you. Reach out with your requirements, and we’ll discuss how we can support your pallet stacking operation with practical, reliable solutions tailored to how you actually work.