Video: Essential Practices and Benefits of Cribbing in Modular Construction

Cribbing in modular construction is more than just a safety measure — it’s a crucial component that ensures the stability, security, and efficiency of transporting and installing modular units. While the term might not be widely recognized outside of the construction industry, cribbing plays a significant role in the structural integrity of modular projects. Our recent video delves into what cribbing is, its role in modular construction, how it aids in the transportation of modules, and best practices to follow when using it.

What is cribbing?

Cribbing is widely used in construction to stabilize heavy loads during lifting, moving, or storage phases. Cribbing in modular construction refers to the process of stacking wooden, metal, or composite blocks in a grid-like structure to create a temporary support system. A crib often sits between 35 and 40 inches high and holds modules off the ground. The cribbing blocks are typically placed under a load to distribute weight evenly and prevent tipping or sinking, ensuring that the structure remains level and secure.

Cribbing is indispensable in the context of modular construction. Modular construction involves building sections or “modules” of a structure in a controlled factory environment, which are then transported to the construction site for assembly. Cribbing provides the necessary support to transport these modules safely and plays a critical role in the overall construction process.

Why is cribbing used in modular construction?

Cribbing is essential in modular construction for several reasons:

• Stability during transportation: Cribbing is used in modular construction to ensure the stability of modules during transportation. Modular units can be massive, heavy, and oddly shaped, making them challenging to transport. Cribbing helps evenly distribute the weight of these units, reducing the risk of shifting or tilting during transit.
• Support during installation: When modules are delivered to a construction site, they often need to be temporarily stored or positioned in a staging yard before final placement. Cribbing provides a stable platform, keeping the modules level and preventing any damage that might occur if they were placed directly on the ground. This is particularly important in areas with uneven terrain or where the ground might not provide sufficient support.
• Safety for workers and equipment: Safety is a top priority in construction, and cribbing plays a crucial role in maintaining a safe working environment. By providing stable support for heavy loads, cribbing reduces the risk of accidents, such as modules tipping over or collapsing, which could endanger workers and equipment.
• Prevention of structural damage: Improper support during module lifting, moving, and storage can lead to structural damage. Cribbing helps prevent this by ensuring that the module’s weight is evenly distributed, minimizing stress on any single point.

How cribbing supports the transportation of modules

The transportation of modular units is a delicate process that requires precision and care. Cribbing supports this process in several ways. First, cribbing spreads the module’s weight over a larger area, reducing the pressure on any single point of the unit. This helps prevent structural damage during transportation, especially when modules need to be loaded onto or off of trailers.

Cribbing can also be adjusted to different heights, which is particularly useful when aligning modules with transportation vehicles or foundation points at the construction site. This adjustability ensures that the modules remain level and stable throughout the project’s process.

Finally, during transportation, modules are subject to various forces, such as vibrations, bumps, and tilting. Cribbing acts as a shock absorber, reducing the impact of these forces on the module and ensuring that it remains intact and undamaged. Once a module is put into storage, ideally, you won’t have to use heavy equipment like a crane or forklift to load it again onto a trailer. Instead, autonomous mod trailers can allow you to crib up the module at a height the trailer can back underneath to self-load and offload with cribbing. 

Best practices for using cribbing in modular construction

To maximize the effectiveness of cribbing in modular construction, consider the following best practices:

• When placing a mod on cribbing, you want the rim joist or the exterior joist of the mod to be centered on the cribbing. 
• You’ll want to ensure you have enough cribbing on both sides of the mod to support the weight and that there aren’t any large spans between the individual cribs. If the spans are too big, you’ll end up with something called deflection.

👉🏼Deflection is when the material spanning the distance starts to bend.

• Make sure the ground is compacted and level enough to support the weight of the modular crib so it doesn’t sink, which might cause the module to fall off the cribbing.
• Always use high-quality cribbing materials, such as hardwood or engineered composite blocks, that can support the weight of the modules. Inferior materials can fail under pressure, leading to accidents or damage.

Partner with specialists who understand the importance of cribbing

Cribbing in modular construction is an essential practice, offering stability, safety, and support during the transportation and installation of modules. At Stream Modular, our team understands the importance of following best practices for cribbing to ensure the safe and efficient handling of modules, ultimately leading to successful project outcomes. Contact our team if you’d like to learn more about our experience and options for optimizing your modular construction project.

Read more: 

• Modular Cribbing Options: Pros and Cons
• Hydraulic Jack Lift Trailers for Modular Construction
• How To Choose the Best Cribbing Blocks for Outdoor Staging Yards

Stream Modular is a transportation logistics company specializing exclusively in modular construction. We help modular manufacturers and builders transport mods, pods, and panels so they arrive on time and safely to the build site.