Steel Shipping containers.  The containers are properly called inter-modal steel building units (ISBUs). These containers can be stacked, and they are designed so that they can be interlocked at the corners.   Shipping container steel structures now litter the ports of America as mementos of our Asian-trade imbalance, recycling the containers is part of the environmental friendly element in the construction process.   Hurricane proof, flood proof, and fire proof ISBU’s are tough enough to be stacked 12-high empty — and thus can be used in smaller multistory buildings.

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