QMH Warehouse Solutions & Services
Understanding Warehouse Racking Sizes and Safety Measures
Posted by Ben Cisneros on October 28, 2024
When you store products in a warehouse, manufacturing facility, or distribution center, you’ll likely need to place these goods on pallets. You can store palletized products in pallet racking. This storage system allows you to organize pallets in horizontal rows that are stretched across multiple levels.
If you’re still altering the layout of your facility, there are numerous pallet rack sizes at your disposal. Each size accommodates different product capacities and dimensions. The total amount of inventory that you need to store in your warehouse also determines what dimensions you require when purchasing pallet racks. If you lack free space, consider building up vertically. Pallet racking can reach as high as 20 feet.
Installing proper racking in your warehouse can enhance safety and efficiency. You’ll be able to properly store your goods and monitor your inventory. The right storage solution can also limit the number of safety hazards that arise when items are being moved in and out of your warehouse. Over time, these racking solutions can help you save an ample amount of money. This guide takes an in-depth look at warehouse racking sizes and the various safety measures you should implement.
At QMH Inc., we’ve spent more than 30 years designing, installing, and inspecting pallet racking systems for warehouses throughout California. The guidance below reflects that hands-on field experience along with the design and safety standards published by the Rack Manufacturers Institute (RMI) under ANSI MH16.1 and the Occupational Safety and Health Administration (OSHA).
Standard Pallet Racking Upright Sizes
Pallet racking is available in numerous sizes. The ideal size depends on the pallets you need to store.
Common Upright Depths
Pallet rack uprights are made to accommodate all types of pallets. The most common upright depths are 36″, 42″, and 48″. If you have standard 48″ deep pallets, the 42″ upright is ideal. You’ll receive 3″ of overhang in the front and back. Keep in mind that the standard pallet size is 48″, which is why most warehouses select 42″ uprights.
If you have 42″ deep pallets in your warehouse, make sure you choose a racking system that comes with 36″ uprights. When your pallets range from 50″ to 56″ deep, you should obtain 48″ uprights. There are also several other racking upright depths that you might have access to, which include 24″, 30″, 44″, and 72″ options. If the rack uprights have a depth of less than 24″, you shouldn’t use them with pallets. However, they can be paired with hand-stacking applications.
Height Specifications
The warehousing industry doesn’t have a specific upright height that it adheres to. In most cases, uprights are made in 2′ increments. They can range from 8′ to 24′ tall, which means that any warehouse or distribution center can install them.
Even though uprights are commonly built in 2′ increments, they can be cut or manufactured to any height depending on your needs. The purpose of an upright is to accommodate the intended load. The load limit for a racking system depends on the post design, the beam spacing, and the steel gauge.
These design and load limits are governed by ANSI MH16.1, the Rack Manufacturers Institute’s standard for the design, testing, and use of industrial steel storage racks. Manufacturers are required to affix a load capacity plaque to each installed rack, and OSHA’s general industry storage regulation (29 CFR 1910.176) requires that this posted capacity never be exceeded.
Width of Uprights
Nearly every racking system comes with uprights that have a 3″ width along the outer face. With this standard in place, you can calculate the length of a single racking row. There are, however, some exceptions to this rule. It’s possible for some uprights to be built with 4″ wide posts. This additional width provides a considerable amount of strength, which supports higher loads.
Choosing the Right Size of Pallet Racking
When you’re searching for the right pallet rack system to install in your warehouse, consider working with a specialist who can help you make the best selection for your facility. The right dimensions and gauge are necessary to support the types of goods that are stored in your facility.
Step 1: Identify the Size and Weight of Your Pallets
To choose the right pallet racking size, you must first identify the size and weight of your pallets. Measuring your pallet dimensions will allow you to determine the ideal shelf level height and bay width. The bay width gives you the ability to calculate the cross-support dimensions and wire decking sizes.
You should measure the height of a loaded pallet to know the distance at which each shelf level should be placed. Make sure you have a minimum clearance of 4″ between the bottom of the beam level and the top of your pallet. With a 4″ clearance, your employees will be able to load and unload the pallets with ease.
Calculating the weight of your pallets is necessary to determine the capacity requirement for every beam level as well as the entire bay. Keep in mind that the spacing between levels and the number of pallets you place on each level will impact the capacity requirement.
Once you weigh one of the loaded pallets in your warehouse, you can identify if the upright frames and pallet rack beams of your racking system are rated above this capacity. Make sure that the racking system supports a weight that’s somewhat heavier than your pallet weight to accommodate any variations. Record the average and heaviest pallet weights during this process.
The total number of pallets that you’re using for a specific application determines the ideal pallet rack length, height, and number of rows. You’ll also be able to identify how much racking you need to support the number of pallets that are being stored in your warehouse.
Step 2: Calculate Frame Depth
The frame depth of your racking system affects storage by setting the space between the load beams. If a pallet has been stored properly, it should hang over the beams by around three inches, which allows the beams to carry the entire pallet weight. To maintain the correct fit, subtract six inches from the total depth of your pallets. Keep in mind that the wire decking doesn’t carry the weight of a pallet. While this decking helps distribute the weight, the beams carry it.
Step 3: Determine Frame Height
If you don’t have much empty floor space in your warehouse, it’s highly recommended that you utilize vertical space. This is the most affordable method of storing a larger quantity of products in the same area. As mentioned previously, rack frames range from 8′ to 24′ in height.
To determine the frame height, you must first identify how tall your ceiling is. Make sure you have at least 18″ to 24″ of space between your goods and the ceiling. If you have overhead sprinklers installed on the ceiling, you must maintain the same amount of clearance between your products and the sprinkler system. Let’s say that you have a 16-foot ceiling. If your pallets are three feet tall, don’t buy anything taller than a 12-foot frame. Consider any trusses, sprinklers, or pipes below the ceiling height as well.
Your best option is to use as much vertical space as possible. The amount of money you spend on a 12-foot frame and a 16-foot one is small compared to the cost of your project. With the right pallet racking system, you can save a lot of money. If you intend to grow your company in the future, consider this when determining which racks to purchase.
It’s also a good idea to identify how high your equipment reaches. Forklifts usually have a maximum reach of around 10 feet, which means that you can’t take full advantage of a 16-foot rack unless you upgrade your material handling equipment.
If you want to go higher than 12 feet, consider high-piled storage requirements as well. Your county or city will assess your sprinkler system as well as the flammability of your goods when you apply for a high-piled storage permit. The county may limit the racking height that you can use in your warehouse.
Step 4: Select Beam Size
Choose beam lengths based on your pallet storage needs. All beam lengths have a height and length, which are referred to as the “face size”. The length of the beams determines the number of pallets you can store on each level. Most racking systems use 8′ beams, which accommodate two standard pallets. You should have at least four inches of total clearance between each pallet and three inches of clearance between the pallet and the upright.
Keep in mind that the face size and length of a beam determine how much weight it can hold. An 8′ beam usually has a load capacity of more than 5,000 pounds. Longer beams are suitable for lighter pallets. The face size of a beam usually ranges from 3″ to 6″.
Warehouse Rack Safety Considerations
Once you install a pallet racking system in your warehouse, make sure that your employees adhere to safety standards and load capacities. If you place too many items on a single rack, the entire system could buckle, which would be a danger to any employees in the vicinity. When items fall off shelves, they can strike the people who are working below.
Perform regular maintenance and inspections on your racking systems to ensure any issues are identified and fixed early on. Your employees should also receive extensive training on safe loading and unloading practices.
The Rack Manufacturers Institute recommends that a qualified person inspect every racking system at least once a year, and warehouses with heavy forklift traffic often benefit from quarterly checks. Watch for bent or dented uprights, missing safety pins, damaged beams, and worn footplates, and take any visibly damaged section out of service immediately until it’s repaired or replaced.
If you’re unsure whether your existing racking still meets current load and seismic requirements, QMH’s material handling specialists can perform an on-site evaluation and help you navigate any required high-piled storage permits.
Conclusion
Selecting the appropriate racking sizes for your facility can boost efficiency and improve your safety measures. Once you identify the weight and size of your pallets, you can choose a racking system that fits in your warehouse and accommodates your goods. With proper warehouse racking, you should notice a reduction in the number of accidents that occur in your facility. You may also be able to improve productivity. Consult with professionals to receive tailored racking solutions.
This guide was last reviewed in July 2026 by QMH’s material handling specialists to reflect current OSHA and RMI storage guidelines. With more than 30 years in the material handling industry, our team can help you evaluate, source, and install a racking system sized correctly for your facility.
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Frequently Asked Questions
The most common upright depths are 36″, 42″, and 48″. As a general rule, choose an upright that is about 6 inches shallower than your pallet depth to allow for a 3-inch overhang on each side. For example, the 42″ upright works best with the standard 48″ pallet. If your pallets are 42″ deep, use 36″ uprights; for pallets between 50″ and 56″ deep, go with 48″ uprights.
Pallet rack uprights typically range from 8 to 24 feet and are commonly manufactured in 2-foot increments, though they can be cut or custom-built to any height. The practical height limit in your facility is determined by your ceiling height (maintain at least 18″–24″ of clearance from goods to ceiling), the reach height of your forklifts (usually around 10 feet), overhead sprinkler placement, and any local high-piled storage permit requirements.
To calculate the proper frame depth, subtract 6 inches from the total depth of your pallets. This accounts for a 3-inch overhang on each side of the beam, which ensures the beams carry the full weight of the pallet. Note that wire decking helps distribute weight but does not carry it — the beams are the load-bearing element, so proper beam sizing is essential.
The length of the beam determines how many pallets you can store per level. Most standard racking systems use 8-foot beams, which can hold two standard pallets. You should maintain at least 4 inches of total clearance between pallets and 3 inches between each pallet and the upright. The face size (height of the beam) combined with its length determines the beam’s load capacity — an 8-foot beam typically supports over 5,000 pounds. Longer beams are best suited for lighter loads.
Once racking is installed, employees should be thoroughly trained on safe loading and unloading procedures and must always adhere to posted load capacities — overloading a rack can cause the entire system to buckle. Regular maintenance and inspections should be scheduled to catch and correct any damage early. Items stored improperly or at excessive heights can fall and strike workers below, so following manufacturer guidelines and OSHA standards is critical for ongoing safety.
