Storage Rack Engineering and Rack Permit Calculations
Storage rack engineering for pallet, cantilever and push-back systems, with seismic calculations, anchors and slab checks sealed for your rack permit.
- Stamped by a PE licensed in your state
- Built to IBC, IRC and local amendments
- Plan-check comments answered
Rack calculations that get through plan review and fire review
Steel storage racks look simple, but a fully loaded row of pallet rack carries tons of product on slender uprights that are anchored to the floor with a few small bolts. When racks reach a certain height, hold heavy loads or sit in a seismic region, building departments and fire marshals require storage rack engineering prepared and sealed by a licensed engineer before the racks can be installed or occupied.
PE Engineer prepares rack permit calculations and drawings for new installations, reconfigurations and relocated used racks. We analyze the uprights, beams, connections, base plates and anchors for vertical, seismic and impact loads, and check the floor slab under the most heavily loaded posts. The analysis follows ANSI MH16.1, the Rack Manufacturers Institute (RMI) specification for industrial steel storage racks, together with ASCE 7 and the building code your jurisdiction has adopted.
Every package is sealed by a Professional Engineer licensed in the state where your warehouse is located. We work directly with owners, rack dealers and installers, and quotes are usually returned the same day once we have the rack layout and component data.
What you receive
- Rack layout plan with aisles and flue spaces
- Elevation of each rack type with beam levels
- Upright, beam and connection calculations
- Base plate and anchor design
- Slab and soil bearing check
- PE stamped calculations and drawings
Rack systems we engineer
We analyze the rack types found in distribution centers, retail stores, manufacturing plants and cold storage buildings.
Selective pallet rack
Roll-formed and structural steel selective rack, the most common system, analyzed for the actual beam levels, pallet weights and upright frame bracing patterns you plan to use.
Drive-in and drive-through rack
High-density lanes where forklifts enter the rack, with extra attention to rail loads, upright impact exposure and the longitudinal stability that open lanes reduce.
Push-back and pallet flow rack
Dynamic systems with carts or rollers that add sloped loads and dynamic effects, coordinated with the manufacturer's flow components and braking devices.
Cantilever rack
Arms and columns for lumber, pipe, steel bar and sheet goods, checked for arm bending, column overturning and the large base anchorage loads these racks produce.
Carton flow and shelving
Picking modules and tall shelving units that fall under rack and building code requirements once they exceed the height or load thresholds your jurisdiction sets.
Rack-supported platforms
Pick modules and multi-level walkways supported by rack uprights, where the rack becomes part of an occupied structure and building code live loads also apply.
Your Stamped, Permit-Ready Plans Start With One Upload
Send your drawings or describe the project. A licensed engineer reviews it and sends a clear, fixed-fee proposal, often within hours.
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- Reviewed by a licensed PE
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When storage rack engineering is required
Requirements vary by jurisdiction, but rack permits are commonly triggered by height, location and the type of material stored. Many building departments require a permit and sealed calculations once racks pass a set height, which is often in the range of 8 feet or more to the top shelf. In seismic regions, many jurisdictions ask for calculations on nearly every installation regardless of height.
Fire codes add a second path. Under the International Fire Code, storage of combustible materials above roughly 12 feet in height, or lower for high-hazard commodities, is generally considered high-piled storage. High-piled storage areas need a fire permit and plans showing the rack layout, aisle widths, flue spaces and commodity classification, and the sprinkler system must be suitable for that storage arrangement.
Common situations that call for rack engineering include:
- Installing new racks in a new or existing warehouse.
- Raising beam levels or adding height to an existing system.
- Relocating used racks from another building, often without original documentation.
- Changing the stored product to heavier pallets or a higher commodity class.
- Repairing damaged uprights and needing an engineered repair detail.
If the fire marshal has already reviewed your layout, send us the comments. We address each item in our response and coordinate with your fire sprinkler design where in-rack sprinklers or changes to ceiling sprinklers are involved.
How storage rack engineering works under ANSI MH16.1
ANSI MH16.1 is the industry standard for the design, testing and use of industrial steel storage racks, and ASCE 7 treats steel storage racks as nonbuilding structures with their own seismic provisions. Together they define how we analyze the system.
The analysis covers:
- Vertical loads from product, the rack’s own weight and the possibility that one bay is fully loaded while the adjacent bay is empty.
- Seismic loads in both the down-aisle and cross-aisle directions, based on site-specific ground motion, the rack’s height and its operating weight.
- Connections between beams and uprights, which carry moment in the down-aisle direction and are often the controlling element. Connector capacities come from the manufacturer’s test data.
- Upright frames including column buckling, frame bracing and the reduction in capacity from perforations in the column face.
- Base plates and anchors for overturning, uplift and shear, designed to ACI 318 Chapter 17.
MH16.1 also requires a load plaque on each rack system showing the permissible unit load and the maximum load per beam level. We provide plaque information with the drawings so the posted capacity matches the engineered design. Accurate component data is essential, so we ask for the manufacturer’s section properties and connector test values, or we identify the system from photos and measurements when the racks are used.
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Slab and foundation checks under rack posts
A loaded rack upright can deliver a large concentrated load into a small base plate, and back-to-back rows put two posts within inches of each other. Many warehouse slabs were designed for general floor loads and forklift traffic, not for tall racks, so the slab check is a critical part of storage rack engineering.
We check punching shear around the base plate, bending in the slab, and the bearing pressure on the subgrade beneath it. The calculation uses the slab thickness and concrete strength from construction records or a core sample, and soil values from the geotechnical report or conservative assumptions when no report exists. Slab joints matter too. A post that sits on a sawcut or construction joint loses part of the slab’s capacity, so we adjust the layout or specify a larger base plate where that happens.
When the slab is not adequate, the usual solutions are larger base plates that spread the load, shorter racks or lighter pallet limits, or new thickened slab strips or isolated footings under the rows. We design the option that keeps your storage capacity while satisfying the building department. For new buildings, we can coordinate rack loads with the slab designer before the floor is poured, which is the least expensive time to solve the problem. See our foundation design service for new slabs and footings.
Used racks, reconfigurations and damage repair
Many rack permits involve equipment that is not new. Used racks are bought from liquidations or moved from another facility, often without the original manufacturer’s documentation. Existing systems are reconfigured with new beam elevations for different products. Uprights are hit by forklifts and bent.
For used racks, we identify the manufacturer and style from photos of the upright face, beam connectors and labels, then use published or tested properties for that system. When the manufacturer cannot be identified, we use conservative assumptions and may limit the allowable load. For reconfigurations, we reanalyze with the new beam spacing, since moving the first beam level higher increases the unbraced length of the upright and can reduce capacity substantially.
Forklift damage is a frequent finding in safety audits. MH16.1 and the RMI guidance call for damaged components to be unloaded and evaluated, and in most cases replaced or repaired with a manufacturer-approved or engineered repair kit. We evaluate damage from photos and measurements and provide sealed repair details, along with column protectors and end-of-aisle guards that reduce future impact. If the racks support a pick platform or walkway, see our platforms and mezzanines service for the deck and access design.
You likely need this if
- Your city requires a rack permit
- The fire marshal asked for high-piled storage plans
- You bought used racks with no documents
- You are raising beam levels or adding height
- You are in a moderate or high seismic area
- Uprights were damaged by forklifts
How it works, start to finish
From your first message to stamped drawings, you work directly with the engineering team.
- 1Share your projectSend the address, scope and any drawings, photos or plan-check comments. Two minutes is enough.
- 2Receive a fixed-fee proposalAn engineer reviews the scope and replies with a firm price and delivery date for your storage rack engineering drawings.
- 3Engineering and draftingWe run the calculations and prepare drawings to the codes your jurisdiction enforces, checked before sealing.
- 4Stamped set deliveredYou receive a sealed PDF set ready to submit, and we answer any plan-check comments within scope.
Codes and standards we design to
Rack designs follow the edition of each code and standard your jurisdiction has adopted, including local amendments:
- ANSI MH16.1, Specification for the Design, Testing and Utilization of Industrial Steel Storage Racks (RMI)
- ASCE 7, including the nonbuilding structure provisions for steel storage racks
- International Building Code (IBC) Chapter 16, Structural Design
- International Fire Code (IFC) high-piled combustible storage provisions
- ACI 318 Chapter 17 for anchorage to concrete
- AISI S100 for cold-formed steel members
How licensing works. Engineering drawings must be sealed by a Professional Engineer licensed in the state where your project is located. PE Engineer works with a network of state-licensed PEs, so every set is reviewed and stamped by an engineer with an active license in the state where your project is located. Their name and license number appear on the seal, exactly as your building department requires.
Related services
Platforms & MezzaninesSteel mezzanines, equipment platforms, catwalks and storage decks designed to the IBC and OSHA, with column footings and stamped permit drawings.Explore More
Fire Sprinkler DesignNFPA 13, 13R and 13D sprinkler layouts with hazard classification, hydraulic calculations and riser details, sealed by a licensed PE for permit.Explore More
Equipment AnchorageSeismic and wind anchorage calculations for machinery, tanks, generators, electrical gear and rooftop units, designed to ASCE 7 and ACI 318 and PE stamped.Explore MoreFrequently asked questions
Do pallet racks need a permit?
Often, yes. Many building departments require a permit and sealed calculations once racks exceed a set height, and many seismic jurisdictions require them for most installations. Storage above roughly 12 feet, or lower for high-hazard commodities, generally triggers fire code high-piled storage review. We confirm what your city and fire marshal require before we start.
What do you need to prepare rack calculations?
The rack layout with aisle widths, elevations showing beam levels, the manufacturer and style of uprights and beams, pallet sizes and maximum pallet weight, the building address, and the slab thickness if known. For used racks, clear photos of the upright face, beam connectors and any labels let us identify the system.
Can you engineer used racks with no manufacturer information?
Usually. We identify the system from photos and measurements and use its published or tested properties. If the manufacturer cannot be identified, we apply conservative assumptions and may set a lower allowable load. In rare cases, testing or component replacement may be the better path, and we will explain why.
Is my warehouse slab strong enough for tall racks?
That depends on the slab thickness, concrete strength, subgrade, joint locations and post loads. We check punching shear, slab bending and soil bearing at the heaviest posts. If the slab falls short, we design larger base plates, adjusted layouts or new footings under the rows.
What is a rack load plaque?
ANSI MH16.1 requires a durable plaque on each rack system showing the permissible unit load and the maximum load per beam level, along with other information. The plaque values must match the engineered design. We provide the plaque information with our drawings so the posted capacities reflect the calculations.
Can you provide repair details for damaged uprights?
Yes. We evaluate damage from photos and measurements, determine whether the component must be replaced or can be repaired, and provide sealed repair details or confirm a manufacturer’s repair kit for your loads. Damaged bays should be unloaded until the repair is complete.
Get your free storage rack engineering proposal
Tell us where the project is and what you need. Attach any drawings, photos or plan-check comments. A licensed engineer reviews every request.
- Upload your filesPlans, sketches, photos or comments
- Get a fixed-fee proposalUsually the same day
- Receive stamped drawingsSealed by a PE licensed in your state