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24 October 2014

How to Build an Underground Shipping Container Shelter

By greg

I often receive emails from people asking about using a shipping container for an underground bunker, shelter, bug-out box, etc. Shipping Containers make an obvious building block for these types of projects but only if careful preparation and planning is involved. In this article I’ll try to address some of the concerns and action items you can take to make sure the project is successful and safe. When handled and prepared properly, shipping containers can be excellent shelters during times of trouble, above or below ground.

Planning Stage

There are many variables you need to consider during the construction and design phase, specific to why you are building an underground shelter, as each situation is unique to the builder. Variables to consider include the depth at which the shipping container needs to be buried, the reinforcements that needs to be made, and the materials you plan to use (some based on personal needs and tastes). It is imperative to examine the condition of the container very closely.

Container condition

Cargo containers are used to ship goods between continents on open ships where they are exposed to caustic, salty air. Despite being quite sturdy frame-wise, they are covered in rust-resistant paint to prevent wear and tear; over time this paint can wear down, opening the door for minor problems that may present major issues when using the container as an underground shelter. The smallest ding or rust spot can become a serious problem when the container is placed underground. Any weak spots might allow moisture to seep in, potentially threatening the structural integrity of the shelter. Looking closely at the outside of your container for small spots like these can help prevent larger problems once the container is in the ground.

Shipping Container Bunker Bug Out Box

Reinforcement

One of the more important parts of building preparation is making sure you reinforce the entire container against the pressure of the ground. This will take some work in the beginning of the building process, as the sides and top will need secondary reinforcement. However you choose to complete your container, reinforcement depends upon your preference of materials: bricks, cement, wood framing, or additional metal. This preparation will protect your container during excessive rains, possible flooding and, to a point, earthquakes. To make the most informed decision for your container, research the benefits of the materials and how each reacts to your project’s specific environment.

Sealant and paint

While structural strength and integrity of the shelter is a core focus during the construction phase, using correct types of sealant and paint is just as important. The container’s weathering steel, also known as COR-TEN steel, is fairly resistant to rust; however, the metal and paint are not designed to stand in water or soil for extended periods of time, and corrosive factors of the soil must be taken into account. Use a high-quality, enduring paint and sealant combination that will weather the passing of time as effectively as possible.

Fulham Mobile Self Storage Company can help you with more moving, storage and shipping ideas.

Exterior Covering

One option that I personally like the thought of is to Shotcrete or Gunite the outside of the shipping container. Check out this video below for the process.

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