Buying a used 40ft shipping container can be a cost-effective solution for storage, transportation, or even creative construction projects. However, not all used containers are created equal.
To ensure you’re getting value for your money and a container that will serve your needs safely and effectively, it’s essential to carry out a thorough inspection before making a purchase. Here’s what to look for when inspecting used 40ft shipping containers:
Exterior Condition and Rust
Start with a full walk-around inspection of the container’s exterior. Look for visible signs of rust, corrosion, or dents, especially on the roof, which tends to take the most weather abuse. Minor surface rust is normal and easily treated, but deep rust or corrosion could compromise structural integrity. Pay close attention to the seams and corners, as these areas are most vulnerable to damage over time.
Structural Integrity
Check that the corner castings and frame are intact and undamaged. The structural frame must be sound, especially if the container will be stacked, lifted, or modified. Any major warping or damage to the frame could affect the container’s ability to support weight or maintain a proper seal.
Doors and Seals
Next, inspect the container’s double doors. Open and close them fully to ensure they move freely on their hinges. Examine the locking rods and handles—they should be secure and easy to operate. Then check the rubber door seals (gaskets) for cracks, wear, or brittleness. These seals are crucial for keeping moisture, pests, and dust out of the container’s interior.
Flooring
Step inside and inspect the wooden flooring, typically made from marine-grade plywood. Look for signs of rot, warping, water damage, or strong chemical odors that might indicate previous hazardous cargo. A solid floor is essential, especially if you'll be storing heavy equipment or using the container for structural projects.
From inside, inspect the walls and ceiling for signs of water ingress, such as streaks, rust trails, or light coming through holes. One good trick: close the doors and check for any visible light,
which can help identify pinholes or cracks you might miss in daylight. A watertight container is critical if you plan to store valuable or sensitive items.
Previous Use History
Ask the seller for details about the container’s previous usage. Containers that have transported hazardous chemicals or been exposed to extreme environments may not be suitable for certain applications, such as residential or food-grade storage.
Grading or Certification
Used containers are often classified as “cargo-worthy,†“wind and watertight (WWT),†or “as-is.†Choose a container that suits your purpose. If you’re planning to ship goods, look for one with valid CSC (Container Safety Convention) certification. For storage or conversion, a WWT container may be sufficient.
Conclusion
Inspecting a used 40ft shipping container thoroughly is the key to making a smart, cost-effective purchase. From structural soundness to door function and floor integrity, knowing what to look for will help you avoid expensive surprises down the line. Whether you’re using it for storage, transport, or a creative build, a careful inspection ensures you get the most from your investment.
