Push-Back Racking (LIFO)

Push-back racking is a high-density dynamic storage solution designed for LIFO (Last In, First Out) operation. Loading and unloading take place from a single face: when a pallet is loaded, the forklift pushes the previously stored pallets towards the rear of the channel; when a pallet is retrieved, gravity returns the remaining pallets towards the front in a controlled manner.

In a trolley-based system, channels can accommodate up to six pallets in depth. In roller-based solutions, greater depths are achievable, constrained primarily by the push force available from the forklift. The system compacts storage and makes better use of the available floor space without requiring the forklift to enter the racking structure.

The main advantage of push-back pallet rack over drive-in rack is operational agility and safety. In push-back systems, the forklift does not need to enter the racking structure, which reduces manoeuvre times and significantly lowers the risk of accidental impacts on the uprights and frames.

The system also allows shorter lanes and the assignment of different SKUs to different channels or levels, offering greater flexibility than other LIFO compact systems. This makes push-back pallet rack particularly attractive when the objective is to combine high density, fast access, and straightforward operation from a single working aisle.

Push-back racking is especially well suited to operations handling palletised loads with medium turnover and multiple SKUs per installation. It is commonly used in food and beverage distribution, logistics, chemicals, and industrial goods sectors — wherever high-density storage is required alongside the ability to differentiate between product lines at channel or level level.

It is less suited to operations with perishable goods or strict FIFO requirements, since the LIFO logic means the most recently loaded pallet is always the first to be retrieved.

The key difference is in the goods flow logic. In FIFO live rack, goods enter at one end of the channel and exit at the other, ensuring that the first pallet in is the first pallet out. In LIFO push-back pallet rack, loading and unloading both take place from the same face, meaning the last pallet placed is the first to be retrieved.

This difference has significant implications for stock rotation and batch management: FIFO is essential for perishable goods, short shelf-life products, or operations with strict lot traceability requirements. LIFO push-back is the better choice when density and operational simplicity from a single aisle are the priorities and FIFO rotation is not mandatory.

The depth, height, and capacity of push-back channels depend on the chosen solution (trolley-based or roller-based), the pallet type, the load weight, and the project-specific operational requirements. Trolley-based systems typically reach up to six pallets in depth; roller-based configurations can extend further, subject to the push force available from the forklift.

AR Racking designs each push-back installation individually, calculating the structural parameters, trolley or roller specifications, and channel geometry to suit the specific loads and operating conditions.

Push-back racking can be used with standard counterbalance forklifts and reach trucks, provided they are appropriate for the load weight and operating height of the installation. No specialist equipment is required — a standard reach truck or counterbalance truck is typically sufficient, which is one of the practical advantages over drive-in systems.

Aisle widths and structural clearances are calculated by AR Racking based on the specific handling equipment to be used.

In a push-back pallet rack system, each channel must be dedicated to a single SKU, as in any compact storage system. This is essential for the LIFO flow to function correctly: all pallets within a channel must belong to the same product to avoid mixing references during retrieval.

Different channels or levels can be assigned to different SKUs, which allows the installation to accommodate a range of products while maintaining the high-density benefits of the system.

Yes. The LIFO operating logic means push-back pallet rack is not the most appropriate solution for goods that require strict FIFO rotation — such as perishable products, pharmaceuticals, or any goods with an expiry date or batch release requirement. In these cases, FIFO live rack or pallet shuttle with FIFO capability should be considered instead.

Push-back racking is best suited to products with stable characteristics over time, where LIFO rotation does not create traceability or quality risks.

Within industrial storage, solutions range from conventional selective racking — which offers maximum accessibility but lower density — through intermediate compact systems, to fully automated storage. Push-back racking sits in the mid-to-high-density zone, offering significantly greater storage capacity than selective racking while maintaining simpler operation than drive-in or shuttle systems.

The choice between trolley and roller configurations depends on the pallet type, the required channel depth, the load weight, the operation, and the project budget. Trolley-based systems are generally preferred for irregular or poorly conditioned pallet bases, as the trolleys provide a consistent and stable support surface. Roller-based configurations can offer greater depths and are often more economical for heavier loads over shorter channel lengths.

AR Racking assesses the most appropriate solution for each project based on the specific loads, pallet specifications, and operational requirements.

Safety during gravity-assisted movement is ensured through specific channel design, controlled incline, and the use of energy-absorbing or retardation elements at key points within the channel. These prevent pallets from accelerating uncontrollably and ensure that each pallet reaches the front position in a smooth and controlled manner.

A push-back installation does not require additional preventive maintenance solely because it incorporates moving components. The maintenance regime should follow the same principles as for any industrial racking system, in accordance with ANSI/MH16.1 maintenance guidelines (or EN 15635): periodic visual inspections by a trained Racking Safety Inspector (RSI), prompt reporting and repair of any damaged components, and verification that the load notice specifications are not being exceeded.

The trolleys or rollers should be checked during routine inspections to ensure that they move freely, are undamaged, and show no signs of deformation or excessive wear.

Yes. Push-back racking can be combined with conventional selective racking within the same installation or the same warehouse zone. This is a common approach in warehouses where most references are held in moderate volumes — suited to selective racking — but certain high-volume or bulk SKUs justify the higher density of push-back storage.

A mixed layout allows the warehouse to optimize space and operational efficiency across different product types, using the most appropriate storage solution for each.