Warehouse 101

Warehouse slotting: the science of storage efficiency

A warehouse is a vital component of a business that deals in physical goods and the efficiency with which it functions can directly impact its bottom line. Warehouse efficiency, also known as warehouse slotting, can be boosted through various means, from applying storage methods based on product popularity to streamlining receiving and shipping procedures. The gain in efficiency translates in less wastage in both space and manpower, which results in increased margins. This is why any sizable company requiring storage space must investigate the most suitable slotting strategies through warehouse layout, inventory management, storage capacity, and picking process. 

What is warehouse slotting?

Warehouse slotting is a process that optimizes the layout of products in warehouse spaces with the ultimate goal of improving efficiency. By organizing products in an order that makes sense for how they will be accessed and used, staff can save time and energy when retrieving items and placing them in vehicles for shipping. Slotting can also help to prevent stock-outs and ensure that the right product is available when it's needed. There are many factors to consider when slotting a warehouse, but with careful planning, the process can be streamlined to make the most of your space.

How does warehouse slotting benefit a business?

The benefits of warehouse slotting are numerous and can provide a significant competitive advantage for businesses. Here are 3 top reasons to employ slotting methods:

1. Cost reduction

Perhaps most importantly, warehouse slotting can help to reduce inventory costs. By storing items efficiently, companies can reduce the amount of time and money spent on inventory management.

2. Boost the rate of order fulfillment

Warehouse slotting can also improve order fulfillment rates and lead times. By consolidating similar items into specific areas of the warehouse, businesses can ensure that orders can be filled quickly and accurately.

3. Improved safety

Finally, warehouse slotting can also help to improve safety conditions in the warehouse by reducing clutter and improving aisle ways. Overall, warehouse slotting is a critical element of warehouse management, and can provide significant benefits for businesses.

A slotting strategy that matches your products

In order to assess what slotting strategy to adopt, it’s important to consider what types of products will be stored. Materials that are durable and workable will have a greater chance of being selected for warehouse location. In addition, warehouses need goods that can maintain their stability throughout storage; this is where the intrinsic properties come into play.

There are 3 main product characteristics that any business must keep in mind when establishing a warehouse slotting strategy:

1. Durability

The durability of the product will influence the distance between the storage and the point of sale. For example, highly perishable goods like fresh fruit and vegetables need facilities very close because they must be consumed quickly after production or harvest time. However, industrial and household products, like most durable goods, do not require warehouses close to where they will be distributed to the public.  

2. Integral stability

Intrinsic stability is a measure of the innate qualities that make up any given product. This factor can have an influence on transportation and safety, as it may be impossible to safely move or store this type of substance due to its intrinsic unreliability within itself without special facilities being required for storage purposes. A prime example is chemically unstable substances. They require safety features usually not provided at warehouses that cater to goods that have little or no volatility. When maintaining low-volatility products such as food items or pharmaceuticals that require long-term storage before use (i.e. more than one year), then proper consideration should also factor into where you store these types of items – their specific needs must match up against what's available at any given moment in order to ensure efficient operations.

3. Handling

Handling a product is often an issue regarding the number and type of movements that can be performed on them. Products with very unwieldy characteristics, such as liquids or bulk aggregates, will require more than one location for storage because they increase in cost exponentially if transferred between locations - this leads not only towards quality deterioration but also the possibility of volume loss during transportation.

The building blocks of a successful warehouse strategy

Keeping your warehouse running smoothly and efficiently is an important part of making sure that you're meeting customer needs. If there are any delays, it could mean missing out on precious sales opportunities. Fortunately for businesses who want their warehouses managed effectively and efficiently, we've identified 6 key points with which to optimize this critical area in order not only to improve its performance but also to generate more revenue as well. 

1. Optimize the warehouse layout

Optimizing the layout of a warehouse is a way of maximizing space and facilitating the operations carried out by employees. An efficient warehouse is equipped with storage systems that increase productivity and allow optimal use of the available surface. Warehouses can be equipped with manual solutions (operators deposit and withdraw goods from their locations) or automated solutions (handling machines manage goods). 

The 2 main characteristics of an effective warehouse layout:

Storage capacity

Warehouse capacity is an important part of logistics operations that goes beyond just optimizing for inventory storage. Understanding your warehouse's current and future physical space will help you decide how much product to have on hand, as well as avoid potential back orders or stockouts from exceeding what’s available at any given time. The ultimate objective should be to have as little space wastage as possible while providing sufficient space to accommodate unforeseen events, such as shipment delays or product returns. One might ask: shouldn't my warehouse be at full capacity (meaning 100%)? The answer is: “no”. The full capacity of a warehouse would impede its capacity to function efficiently and would end up being counterproductive. In fact, warehouse slotting experts say that the optimal space dedicated to storing represents between 22% and 27% of the total storage area. On that note, the website ReliablePlant gives great pointers to calculate your storage needs.

A layout minimizing movements

An efficient warehouse is one where the movement of workers and goods is kept to a minimum. To attain maximum space efficiency, it's necessary to use the most efficient route with minimal walking through each area assigned to operators or workers, so they can find products without having to move around too much within the facility. Longer distances don't only mean more time performing a task, but also an increase in spent energy, which accelerates worker fatigue. 

2. Label products and use QR codes or barcodes

A coding system is key to efficient warehouse management. Products should be properly labeled with barcodes, QR codes, or RFID tags, so they can easily and quickly identify their location in a massive storage area. The codification process allows warehouse staff to access information about each item, including the arrival date at the facility, its composition, and if there is an urgency with the product, meaning that it goes to a specific location, where it will be prepared for shipping.

3. Use the ABC method to classify products in a warehouse or distribution centre

The importance of proper organization cannot be overstated. It has a positive effect on every aspect of the warehouse from classifying goods to speeding up production with best-selling goods near loading docks, but there are even more benefits. The ABC method for categorizing products makes it easy because they can simply go by their relevance within your business.

What's the ABC method?

The ABC method is based on the 80/20 rule (the Pareto principle or Pareto's Law), which states that 20% of the effort produces 80% of the results. If we apply this logic to the company's warehouse, 80% of the flux comes from 20% of the items, while the remaining 80% of the goods generate only 20% of the flux. 

How the ABC Method works in a warehouse space:

The ABC method is a great way to divide your inventory into 3 classes. 

A - class

The first 20% of products or A-class items represent about 80 percent turnover rate and have high sales volume; these must be stored near discharge areas so that they do not need too much handling during entry/exit processes. 

B - class

Thirty percent of these items represent approximately 15% of the total inventory value and benefit from an average turnover rate. They’re not bestsellers, but are sold regularly. Class B products should be stored in the middle of the warehouse. The challenge is to monitor the popularity of these products regularly. An uptick in sales (making them bestsellers) or a sales downturn (C-Class goods) would require a change in location within the warehouse.  

C - class

The remaining 50% of items represent approximately 5% of the total inventory value, and thus have a low turnover rate. These are the products that sell the least, but are still necessary to the company's catalog. You can store these products in the back of the warehouse or in more difficult-to-access areas, such as the upper levels of the pallet racks.

4. Automate for ultimate warehouse efficiency

Automation is gradually infiltrating many operations in business, and this trend will only accelerate in the coming years. This means that your competition is choosing to automate as much as possible within the chain of production, warehousing, and delivery.

Within a warehouse, automation can easily be applied by using:

  1. Automated storage systems
  2. Automated internal flow of goods
  3. Automated order-picking process

5. Apply the lean logistics strategy

Lean Logistics is a management and organizational philosophy originating from Japan. Using Lean logistics consists of identifying and eliminating activities that do not add value to the Supply Chain. This technique increases the speed of product flows and minimizes costs. Huge firms such as Toyota built their notoriety by applying its principles. 

In the context of a warehouse, Lean Logistics could be applied as follows:

  • ​​Encourage the development of problem-solving skills amongst the warehouse staff; 
  • Develop the coordination structures based on a culture of mutual aid and creative energy; 
  • Continuously monitor the risks associated with suppliers, shipping, and manufacturing; 
  • Maintain a minimum stock level to cover replenishment times and prevent stockouts; 
  • Favour the “Pull” (demand-driven) over the “Push” (production-driven) systems to avoid waste and reduce storage costs.

6. Identify the KPIs and gauge performance

The performance of a warehouse is measured by KPIs that provide information on how the operations are performed. To collect this data, warehouse managers can use software to track warehouse interactions and provide logistics managers or supply chain planners with accurate insight into their facility’s actual output level.