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Single-Deep Selective Racks vs Double-Deep Selective Racks

In a typical application, pallet racks are installed back-to-back, creating aisles in which forklifts can access inventory, creating a single-deep system with only one layer of pallets. Systems can also be installed as double-deep, which can increase inventory storage by an additional 20-40%. This is a much more complex system, with specific requirements.

Single-Deep Selective Racks

If you have a large number of stock keeping units (SKUs), and handle large quantities of inventory that has a low turnover rate or high selectivity, then single-deep selective racks may be the most effective solution for you. This is because it allows for direct access to every pallet.

Single-deep racking is the standard configuration and works with all different types of racking. It is simple and cost-effective to install and reconfigure, and can be used with LIFO or FIFO configurations. Single-deep racking creates 8/9’ wide aisles and inventory can be retrieved using standard material handling equipment.

Double-Deep Selective Racks

Double-deep racking consists of up to four pallet rack assemblies that are installed back-to-back-to-back-to-back, creating double the depth of storage on either side of an aisle. This configuration can eliminate up to 50% of aisles, and the fewer aisles a facility has, the more available storage space you have.

This system works best with inventory that has; long-term shelf life and can be used in an LIFO loading design, inventory without expiry concerns, or cold storage in order to minimise costs and increase efficiency of cooling. This is because the nature of double-deep racking means inventory is less accessible - with only 50% of SKUs directly in reach.

Double-deep pallet racking also requires specialist equipment due to its depth. Pallets located on the rear rack are too short for standard forklift forks to reach, requiring them to be modified or replaced with telescopic forks. Other modifications can be added, including tapered forklift legs that create a broader access point to minimise collision damage, and having rollers or guides to assist the movement of inventory once in racks, and adding scissor lifts.

While double-deep racking may seem like a very effective and efficient option, it depends on your specific needs. Depending on your building’s size and layout, a double-deep setting may only provide minimal storage gains, not the full extent of what is possible. The cost of switching to double-deep racking is also a factor to consider; in order to reach maximum efficiency, you must have specific equipment, which could be cost-prohibitive.

Here at DC Space and Storage Solutions, we’re always on hand to discuss, design, and install a system that will enable you to reach maximum efficiency within your warehouse. Get in touch today to see what we can do for you!

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