The foundation is one of the few things that I needed to get professional help in designing. I wanted to make sure it was done correctly and safely, especially when the internal walls were going to be completely removed. After looking high and low for an engineer that could help me with shipping container construction, I found George Runkle at Runkle Consulting, Inc. He has a lot of experience in this area, and has even developed his own computer programs to analyze the structural integrity of shipping containers when they are modified. These programs were specifically used on my cabin to spec out the steel box beams that would be welded to the top of the cabin for support when the walls were cut out.
Proposed cabin foundation
The first foundation George designed was a series of piers to support all of the container corner blocks. Each pier had a metal plate on top with welded rebar embedded into the concrete pier. When the container was set into place on the foundation, the corner blocks could be welded to the metal plates. This would definitely be the most cost effective foundation, and would also be the easiest for the do-it-yourselfer to build. In fact, most of the container cabins you see online use some sort of pier foundation. Unfortunately, I really don’t like the look of pier foundations, and have actually had some trouble with them in the past.
Final cabin foundation
I then asked him for a foundation with 1′ thick walls in the front and back to support the containers. To me at least, this was much more aesthetically pleasing, and gave the cabin a more substantial and rugged appearance. I also have the option to easily enclose the foundation with treated plywood on the sides if I ever wish to. This could give me a bit more storage space protected from the weather if I ever need it.
The two center piers are to support the floors when the four inside walls are completely removed. The piers are 6-8 inches below the height of the outside walls, and will be shimmed with treated lumber to the correct height when the containers are in place. The top of the containers will be reinforced with two 6″x3″x20′ steel box beams welded to the containers.
final cabin foundation in SketchUp
Hi Steve,
You have an awesome site and I check back often to see the progress you have made on your cabin. I was wanting to design a home for myself and a lot of the steps you have gone through will also apply to my plans.
I am in the phase now of trying to assemble the overall costs associated with such a project and was wondering how much these foundation plans cost you (if you don’t mind sharing). Did the firm charge by the hour or was it a flat fee?
Thanks, -Jeff
Jeff:
My foundation and roof reinforcement plans were a flat fee of a few hundred dollars. My design was a simple one, and I’m sure cost is commensurate with complexity. What matters most is if you are removing any structural components from the containers. If I wouldn’t have needed the roof reinforcement, I probably could have just figured something out with my foundation contractor.
Steve
Hi Steve,
I am planning to make something similar to your house, but is possible to take advantage of your foundation space to have a garage under your containers whithout any other additional one.
Thanks, Jr
Jr:
I think it’s a great idea as long as you don’t mind having to walk up a flight of stairs to get into your cabin. I have actually seen this done with containers, but I can’t find the picture of it on the net anymore. If you build it, be sure to send me a picture.
Steve