In any warehouse or storage facility, the safety and stability of your pallet racking system are paramount. A level and secure rack not only protects your inventory and equipment but, more importantly, ensures the well-being of your team.
While often overlooked, pallet rack shims are essential components for achieving stability, especially on uneven floors. Understanding the importance of pallet rack shims is a crucial step toward creating a safer, more efficient, and compliant warehouse environment.
What Are Pallet Rack Shims?
Pallet rack shims are thin, durable plates, typically made of steel, that warehouse supervisors place underneath the base plates of pallet rack uprights. Their primary function is to compensate for variations in floor levelness, ensuring the entire racking system is plumb and stable.
Even in newly constructed facilities, concrete floors are rarely perfectly flat. They can have subtle slopes for drainage, high and low spots, or cracks and inconsistencies that develop over time.
When a business installs a pallet rack upright on an uneven surface, it can tilt or lean, compromising the structural integrity of the entire system. Shims correct these imbalances by filling the gaps between the base plate and the floor, creating a solid, level foundation. This simple solution prevents rocking, swaying, and uneven weight distribution, which are major contributors to rack failure.
Why Are Shims Crucial for Warehouse Safety?
The stability of your pallet racking system is not just a matter of operational efficiency; it's a fundamental safety requirement. Using pallet rack shims is a critical practice that directly impacts warehouse safety, compliance, and the longevity of your assets.
Ensuring Structural Integrity
A pallet rack must withstand heavy loads, but its capacity is guaranteed only when installed according to the manufacturer's specifications. A key specification is that the uprights must be perfectly vertical, or "plumb."
When an upright is not plumb, the load distribution across beams and columns is altered, resulting in excessive stress on certain components. This can lead to bent beams, damaged uprights, or even a catastrophic system collapse. Shims ensure each upright is properly aligned, maintaining the intended load distribution and overall structural integrity.
Compliance With Safety Standards
The Occupational Safety and Health Administration (OSHA) and the Rack Manufacturers Institute (RMI) set industry standards that require all facilities to properly install pallet racks and maintain them in plumb condition. Specifically, RMI guidelines require that the out-of-plumbness of a loaded rack column not exceed 1/2 inch per 10 feet of height.
Failing to meet these standards can result in significant fines, operational shutdowns, and legal liability in the event of an accident. During a safety audit, inspectors will check for plumbness. Having a properly shimmed racking system is a clear indicator that your organization prioritizes safety and adheres to industry best practices.
Preventing Equipment and Inventory Damage
An unstable rack system poses a significant risk to your inventory. Leaning racks can cause pallets to shift or fall, leading to damaged goods and financial losses. Furthermore, an uneven system can interfere with the operation of material handling equipment, such as forklifts.
Operators may find it difficult to load or unload pallets from a leaning rack, increasing the risk of collisions that can damage both the equipment and the racking structure itself. By ensuring a level installation with shims, you protect your valuable assets and maintain smooth operational workflows.
How To Correctly Install Pallet Rack Shims
Proper installation is key to unlocking the safety benefits of pallet rack shims. Businesses should be meticulous during the initial rack assembly or when re-evaluating existing systems.
Step 1: Assess the Floor Levelness
Before installing the uprights, use a laser level or a long straightedge level to assess the floor's evenness where the base plates will sit. Identify any low spots or gaps beneath the base plate of each upright frame. This initial assessment will help you determine where and how many shims your warehouse will need.
Step 2: Position the Upright and Insert Shims
Place the pallet rack upright frame in its designated position. If you've identified a gap under the base plate, slide one or more shims into the space to fill it. The goal is to make the base plate sit firmly on the floor, without the possibility of rocking.
It’s important to use shims that are the same size or larger than the base plate to provide adequate support. Never use smaller, makeshift materials like wood, cardboard, or folded metal scraps, as these can compress or shift over time.
Step 3: Check for Plumbness
With the shims in place, use a magnetic or laser level to check whether the upright is plumb. Check for plumbness in both the down-aisle and cross-aisle directions.
- Front-to-Back: Place the level on the face of the upright column.
- Side-to-Side: Place the level on the side of the upright column.
Adjust the number of shims as needed until the upright is level in both directions.
Step 4: Anchor the Upright
Once the upright is plumb and stable, anchor it to the concrete floor by drilling through the anchor holes in the base plate and the shims. Using shims with pre-drilled slots or holes that align with the base plate’s anchor holes makes this process much easier.
Ensure your team tightens the anchors to the manufacturer's recommended torque specifications. A secure anchor connection is vital for preventing any movement or shifting of the rack system.
Step 5: Schedule Regular Inspections
Installation is not the final step. Warehouse floors can settle, and operational activities can cause changes over time. Incorporate regular rack inspections into your maintenance schedule. During these checks, verify that all uprights remain plumb and that the shims are secure and in good condition.
Take the Next Step Toward a Safer Warehouse
Understanding how to use pallet rack shims properly is essential to maintaining safety in your facility. Shims are a cost-effective investment that protects your employees, inventory, and equipment while ensuring compliance with critical industry standards.
Building a culture of safety starts with attention to detail. If you are planning a new rack installation, then it is vital to work with pallet rack installers who know what they’re doing. At Direct Pallet Racking, we provide a comprehensive assessment of your facility and recommend the right solutions to enhance your operational safety and efficiency.
Contact us today to get a quote and ensure you build your racking system on a foundation of stability and trust.
