No single racking system suits every warehouse. The right choice depends on stock variety, access requirements, throughput volumes and available space. A facility storing hundreds of different SKUs with frequent picking needs a different solution than one holding large volumes of identical products with predictable turnover. Understanding how each racking type balances access, density and stock rotation allows warehouse and Logistics managers to select systems that support operational needs rather than work against them.
This guide explains the main warehouse racking systems, their trade-offs and when each is appropriate.
Selective Pallet Racking: Maximum Access With Lower Density
Selective pallet racking is the most common (and economic) warehouse storage system because it provides direct access to every pallet position. Each pallet can be retrieved without moving others, making it ideal for warehouses with many SKUs, frequent picking and varied inventory turnover.
The system uses upright frames and horizontal beams to create individual pallet positions arranged in rows with aisles between them. Forklifts access pallets from the aisle, and bay heights can be adjusted to accommodate different load sizes. Selective racking is straightforward to install, reconfigure and expand as needs change.
The trade-off is lower storage density compared with other systems. Each pallet requires dedicated aisle access, which means aisles consume over 50 percent of floor space in conventional layouts. For warehouses where pallet variety and access speed matter more than maximum density, this trade-off is acceptable.
Selective racking suits operations with diverse product ranges, high SKU counts and picking-intensive workflows. It works well for third-party logistics providers, retail distribution centres and manufacturers with varied finished goods.
Storepro’s pallet racking systems include selective racking configured for New Zealand Building Code compliance and designed to match forklift types and operational requirements.
Drive-In Racking: High Density for Uniform Stock
Drive-in racking systems prioritise storage density over individual pallet access. They allow forklifts to drive into the racking structure along lanes of stacked pallets, eliminating many aisles and maximising use of available floor space. Storage density can increase by 60 to 80 percent compared with selective racking in the same footprint.
Drive-in racking operates on a last-in-first-out (LIFO) basis. Forklifts load and retrieve pallets from the same end of the lane, so the most recently stored pallet is the first one picked. This suits warehouses holding large quantities of identical products with consistent turnover where stock rotation is not critical.
Drive-through racking allows access from both ends of the lane, enabling first-in-first-out (FIFO) stock rotation. Pallets are loaded from one side and retrieved from the other, ensuring older stock moves out before newer stock. This configuration requires access aisles at both ends but still delivers significant density gains. This drive through racking system is very difficult to comply with in New Zealand due to seismic regulations.
Both systems work best for operations with few SKUs, high pallet counts per product and predictable movement. Cold storage facilities, beverage distributors and seasonal goods warehouses commonly use drive-in or drive-through racking to maximise storage while minimising refrigeration or building costs.
The limitation is access. Retrieving a pallet from deep within a lane requires removing pallets in front of it, which reduces picking speed and creates handling inefficiency. These systems are not suited to high-variety inventory or fast-picking environments.
Push-Back Racking: High Density With Faster Access
Push-back racking offers higher storage density than selective racking while retaining easier access than drive-in systems. It uses a series of nested carts mounted on inclined rails that allow pallets to be stored two to six deep per lane. When a new pallet is loaded, it pushes existing pallets back along the rails. When the front pallet is removed, the remaining pallets roll forward under gravity.
The system operates on a LIFO basis, so the last pallet in is the first one out. This makes it suitable for warehouses with moderate SKU variety where some products have multiple pallets but stock rotation is not time-sensitive.
Push-back racking reduces aisle requirements because multiple pallets are stored in depth rather than side by side. This increases storage density by up to 50 percent compared with selective racking while maintaining reasonable picking speeds. Access is faster than drive-in systems because forklifts do not enter the racking structure.
The system suits operations with medium SKU counts, higher throughput than drive-in applications allow and space constraints that justify the additional cost over selective racking. It works well for manufacturing, food distribution and retail warehouses storing fast-moving products with limited stock rotation concerns. The downside to this system is cost per pallet position.
Pallet Flow Racking: FIFO Storage for Time-Sensitive Goods
Pallet flow racking uses gravity rollers or wheels to move pallets automatically from the loading end to the picking face. Pallets are loaded at the higher rear of the lane and travel forward on a slight decline until they reach the front position. When a pallet is picked, the next one rolls into place, ensuring strict first-in-first-out (FIFO) stock rotation.
This automatic rotation makes pallet flow ideal for perishable goods, date-sensitive products or any inventory where older stock must move before newer stock. It eliminates the risk of stock sitting at the back of a lane and expiring or becoming obsolete.
Pallet flow systems also improve picking efficiency. The picking face is constantly replenished without manual restocking, and pickers always work from the same aisle position. This separation of loading and picking activities reduces congestion and allows warehouses to operate with higher throughput in smaller footprints.
The trade-off is higher upfront cost compared with selective or drive-in systems. The roller or wheel tracks add expense, and installation requires precise alignment and adjustment. However, for operations where stock rotation is critical and picking speed matters, the efficiency and space savings justify the investment.
Pallet flow racking suits cold storage, food and beverage distribution, pharmaceutical warehousing and any operation where product shelf life or batch control is essential.
Cantilever Racking: Designed for Long and Oversized Items
Cantilever racking supports long, bulky or awkward loads that do not fit standard pallet dimensions. The system uses vertical columns with horizontal arms extending outward, creating open storage bays without front uprights or beams obstructing access. This design accommodates timber, steel pipes, sheet materials, furniture and other oversized items.
The open-front configuration allows easy loading and retrieval using forklifts or overhead cranes. Arm lengths and spacing can be adjusted to suit different product sizes, and capacity is determined by arm strength and column bracing rather than beam ratings.
Cantilever racking is not designed for pallet density or high-volume picking. It prioritises accessibility and flexibility for non-standard loads. Storage density is lower than pallet racking systems, but for warehouses handling long or irregular items, there is often no practical alternative.
The system suits timber yards, steel merchants, building supply warehouses and manufacturers storing raw materials or finished goods that exceed standard pallet dimensions.
Comparing Racking Systems: Access Versus Density
Understanding the trade-offs between access, density and stock rotation helps narrow down suitable racking options. The following comparison outlines key differences:
| Racking Type | Storage Density | Pallet Access | Stock Rotation | Best Use Case |
| Selective | Low to medium | Direct access to every pallet | Flexible | High SKU variety, frequent picking |
| Drive-In | High | Limited (LIFO) | LIFO only | Low SKU count, uniform stock |
| Push-Back | Medium to high | Moderate (LIFO) | LIFO only | Medium SKU count, higher throughput |
| Pallet Flow | High | Excellent (FIFO) | Strict FIFO | Time-sensitive or perishable goods |
| Cantilever | Low | Excellent | Flexible | Long or oversized non-palletised items |
Most warehouses benefit from combining racking types rather than relying on a single system. Fast-moving products may suit pallet flow or push-back racking, while slower-moving items work well in selective or drive-in configurations. Matching each product category to the appropriate racking type optimises both density and efficiency.
Advanced and Automated Systems for Complex Operations
Automated racking systems such as shuttle racking and automated storage and retrieval systems (AS/RS) represent advanced solutions for high-volume or labour-constrained operations. These systems use automated shuttles, cranes or conveyors to move pallets without manual forklift handling, delivering very high storage density and throughput.
Shuttle systems use motorised carts that travel along racking lanes to retrieve and deposit pallets. They can operate in semi-automated mode where forklifts load the shuttle at the aisle face, or fully automated mode integrated with warehouse management software. Shuttle systems suit operations with high pallet volumes, predictable SKU profiles and the capital budget to justify automation investment.
AS/RS installations involve significant infrastructure including rail-guided cranes, control systems and warehouse management integration. They deliver maximum density and speed but require substantial upfront cost and ongoing maintenance. These systems suit large-scale distribution centres, cold storage facilities and operations where land or building costs make space efficiency critical.
For most small to medium warehouses, conventional racking systems provide better value and flexibility. Automation becomes viable when throughput volumes, land constraints or labour costs justify the investment and complexity.
Storepro provides high density racking solutions and automated shuttle racking systems for operations ready to move beyond conventional pallet storage.
Choosing the Right System Starts With Understanding Your Warehouse
Racking selection should follow operational needs rather than trends or assumptions about what other warehouses use. The process starts with understanding current and future inventory profiles, throughput requirements and space constraints.
Key questions include how many SKUs need storage, whether stock rotation matters, how frequently pallets are picked, what forklift equipment is available and how much growth is anticipated. Answering these questions clarifies whether access, density or stock rotation is the primary driver and which racking systems align with those priorities.
Most warehouses benefit from professional assessment before committing to a racking type. Layout design, load calculations and compliance requirements all affect system selection and installation success. Engaging with experienced storage providers early in the planning process avoids costly mistakes and ensures the chosen system supports long-term operational goals.
Find the Right Racking System for Your Warehouse
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