Shipping containers have proven to be versatile structures for modern living and creative design. They are easy to transport, durable, and cost-effective, making them an ideal option for those interested in building a home, storage space, or retail space.

When it comes to building large projects using containers, merging multiple containers together is the first step to achieving your vision. So, how can you join two shipping containers together successfully? In this blog post, we’ll take a closer look at how to join two shipping containers together and tips to ensure your project’s success.

Can You Join Two Shipping Containers Together?

The idea of creating a larger living space by connecting two shipping containers is becoming increasingly popular. And the good news is it’s not as difficult as one might think to join two containers together. While it does require some cutting and welding, with the right tools and expertise, it’s a fairly straightforward process. Once connected, the larger living space can be customized to fit your needs, whether a quirky cabin retreat or a modern, minimalist home. So, if you’re considering a container home, don’t shy away from the idea of connecting two – it might just be the solution you’ve been searching for.

Preparation and Planning

Choosing the Right Containers: Size, Type, and Condition

Before starting the process of joining two containers together, it’s essential to choose the right containers. Factors such as size, type, and condition should be taken into account when making your selection.

• Size: Shipping containers typically come in standard sizes: 20ft or 40ft. You can join two containers of the same size for a larger living space or join one smaller and one larger container for a unique design.
• Type: Dry containers are the most commonly used type, while reefer containers have built-in refrigeration units. Consider which type will best suit your needs.
• Condition: Inspect the containers for any damage, rust, or corrosion before purchasing. While some minor damage can be repaired, significant damage may affect the structural integrity of the containers and make them unsuitable for joining.

Site Preparation

Once you have your containers, preparing the site for installation is important. This includes leveling the ground, ensuring adequate drainage, and providing access for heavy machinery. Depending on your location, you may also need to obtain necessary permits and adhere to building codes. It’s crucial to have a solid foundation for the containers to be properly supported and level.

Tools and Materials

To join two shipping containers together, you’ll need a variety of tools and materials, including welding equipment, drilling tools, steel plates, bolts, and sealants. Be sure to have all the necessary tools on hand before beginning the process to avoid any delays.

How to Join Two Shipping Containers Together: Methods for Success

Method 1: Welding

Welding is often considered the most robust method for joining two shipping containers, creating a strong and permanent bond ideal for structures intended to withstand heavy loads and severe weather conditions. The welded joints essentially fuse the containers into a single, cohesive unit, providing not just stability but also an increased level of security against potential break-ins or breaches.

The main drawback of welding, however, is the need for specialized equipment and expertise. Proper welding necessitates the use of high-quality welding machines, protective gear, and the presence of a skilled welder to execute the job effectively. Additionally, the heat generated during the welding process can lead to distortion in the containers’ metal structures, potentially affecting their integrity if not managed correctly.

As for the steps involved, the welding process begins with preparing the surfaces of the containers where the welds will occur. This typically involves cleaning the surfaces thoroughly, removing any paint, rust, or debris, and ensuring they are perfectly aligned. Tack welding is then performed to secure the containers in the appropriate positions.

These initial welds are small and spaced apart, providing enough strength to keep everything aligned for the final step: continuous welding, which permanently joins the containers. Continuous welding requires a steady hand and a keen eye to maintain even welds and avoid heat-related distortion as much as possible.

Method 2: Bolting

Bolting involves securing the containers’ corners and sides using bolts, nuts, and washers. This method is suitable for temporary structures or those that may require disassembly in the future.

The process begins with drilling the holes into the container’s corner posts at designated locations to ensure proper alignment when connecting them.

Once drilled, the containers are aligned, and bolts are inserted through the holes and secured with washers and nuts. Using the correct bolt size and torque specifications for a secure connection is essential.

Method 3: Interlocking Kits

Interlocking kits provide an easy, DIY-friendly way to join containers without welding or specialized tools. These kits come with components that attach to each container’s corners, allowing them to be joined and sealed together.

The process starts with attaching the kit components to each container’s corner posts, aligning them, and connecting the kits until all containers are secured. Once in place, sealants can be applied to fill any remaining gaps or holes.

Method 4: Adhesive Bonding

Adhesive bonding involves using high-strength adhesives to bond containers together. This method suits smaller structures or those not expected to bear heavy loads.

The process involves cleaning and preparing the surfaces of the containers, applying the adhesive, and joining them together while ensuring proper alignment. This method may also require additional reinforcement with bolts or welding.

Method 5: Container Clamps

Container clamps are specialized devices designed to provide a secure connection between containers without welding or drilling. These clamps come in various sizes and designs, allowing them to accommodate different container types and configurations.

To use container clamps, the containers are first aligned and brought into close proximity. The clamp is then placed over the joining areas of the containers, tightened securely using a wrench or ratchet, and locked in place to hold the containers together. Some clamps also include additional features, such as lock boxes for added security.

Additional Considerations

Weatherproofing: Essential for Longevity

One of the primary considerations when joining shipping containers is ensuring a tight seal to keep out moisture and prevent leaks. Proper weatherproofing is critical to ensure the longevity and structural integrity of the joined containers.

Silicone or polyurethane-based sealants are generally recommended, as they provide excellent adhesion and flexibility, making them ideal for metal structures that may experience minor movements due to temperature changes. Additionally, these sealants can withstand harsh weather conditions and last for extended periods.

Insulation: Controlling the Climate

When joining containers together to create a livable or usable space, it’s essential to consider insulation. Shipping containers are made of metal, which conducts heat quickly, making them prone to extreme temperatures. Proper insulation helps maintain a comfortable and consistent temperature inside the container while also reducing energy costs.

Various options for insulating joined shipping containers include spray foam insulation, rigid foam boards, or even natural materials like straw bales. The type of insulation used will depend on factors such as budget, climate, and intended use of the space.

Interior Finishing: Customizing Your Space

Once the containers are securely joined and weatherproofed, the next step is to customize the interior of the combined space. The options for interior finishing are virtually endless, allowing you to transform your shipping container structure into a functional and comfortable living or working area.

Some common interior finishing options include flooring materials like linoleum, hardwood, or vinyl planks; wall treatments such as drywall, paneling, or shiplap; and electrical installations for lighting, outlets, and appliances.

Some Common Mistakes People Make When Trying to Join Two Shipping Containers Together

Joining two shipping containers together can be a great way to create a unique and versatile space. While it may seem like a straightforward process, there are some common mistakes that people make that can lead to structural issues down the line. One common mistake is not properly reinforcing the connection points, which can lead to stress fractures and potential collapse. Another mistake is not properly sealing gaps between the two containers, which can lead to leaks and water damage. It’s important to properly plan and execute the joining process to ensure a safe and functional space for years to come.

Conclusion

Joining shipping containers together can be a cost-effective and efficient way to create various structures. Depending on the intended use of the space, different methods such as welding, bolting, interlocking kits, adhesive bonding, or container clamps can be used.

It’s essential to consider additional factors such as weatherproofing, insulation, and interior finishing to ensure a durable and functional end result. With proper planning and execution, joined shipping containers can provide an innovative solution for housing, workspaces, storage, and more. 

So whether you’re looking to create a tiny home, an office space, or a unique vacation retreat, joining shipping containers together may be just the solution you need.  So go ahead and get creative with your container structures and see what amazing space you can create. Thanks for reading our post about how to join two shipping containers together. Happy building!