Blocklager

What is a block storage system?

In a block storage system, pallets or other load units are stacked on top of one another at floor level without a supporting rack structure and arranged side by side in contiguous blocks. Storage takes place in aisles used exclusively for put-away and retrieval, not for cross-access. Because no racking is required, the available floor space can be used with exceptional efficiency: nearly the entire footprint is available for goods, and building height is limited only by the stackability of the goods and the permissible floor load.

How does a block storage system work in practice?

The access sequence typically follows the LIFO principle (Last In, First Out), since the most recently stored pallet is positioned at the front of the block and can be retrieved first. For perishable or batch-tracked goods where FIFO (First In, First Out) is mandatory, the classic block storage system is therefore only suitable to a limited extent — unless blocks are fully emptied before new goods are stored.

The following conditions are critical for operation:

• The floor surface must be able to bear the stacking load evenly; unevenness increases the risk of tipping.
• Clear floor markings and aisle signs are necessary to allow forklifts to maneuver safely without damaging goods.
• The permissible stacking height is determined by the compressive strength of the packaging, pallet quality, and internal safety regulations.
• Homogeneous items with high turnover per SKU — such as seasonal goods, building material pallets, or beverage casks — are typical candidates.

Industrial trucks such as counterbalance forklifts or reach trucks handle put-away and retrieval. Automated variants of the block storage system, such as channel storage systems with recessed conveyor channels or flow racks, combine the block principle with controlled access strategies and mitigate the LIFO disadvantage.

What factors matter when making a selection?

The decision in favor of a block storage system depends on several factors that you should carefully weigh against one another:

• Product range structure: The fewer the SKUs and the more pallets per SKU, the better suited the block storage system. With a broad product range, the risk of having to open blocks prematurely and blocking floor space increases.
• Turnover rate: Fast-moving items with high unit quantities benefit from the high storage density; slow-moving items can tie up entire blocks for extended periods.
• Batch separation and best-before date management: If batch-pure storage or strict FIFO sequencing is required, block variants with channel guidance or alternative storage systems must be evaluated.
• Capital and operating costs: The savings on racking costs are offset by higher demands on floor quality, markings, and potentially wider forklifts. A TCO (Total Cost of Ownership) analysis is recommended.
• Scalability: Block storage systems can be flexibly reconfigured and expanded without structural modifications, as long as load-bearing capacity and fire safety clearances are maintained.

Compared to pallet racking, the block storage system offers higher space utilization but foregoes selective direct access to individual pallet positions. Which system is the better fit depends on the vendor and the specific project, and should be determined through detailed simulation as part of a warehouse planning process.