can you explain RCP please? Ive never heard that term

d'oh, never mind its further down :-)

Neat idea! Maybe there's a recommended material for a 'sacrificial anode'? Not sure..

There is.... It's called Diaelectricl protection or some shit like that.

And you dont need to worry, it's a very small amount of volatage, not dangerous.

What about some sort of rubberized paint? Or maybe that tar type stuff they line bathroom showers with before they tile them. Spray on some insulation and then cover it with a layer of tar. Set them up on blocks so the bottom isn't sitting in the dirt. Or how about getting those used billboard vinyls and layering them roofing style. Once they were buried they wouldn't disintegrate.

You really have to do your research on the ventilation aspect of this project. If it's not done properly it could be a dank, drippy, cold hovel.

How much is the RCP B? I don't think you would want it to be used! There is a link on this tribe were someone made some hostel type hotel rooms from some 10+ foot diameter RCP. Being in the trades myself I tend to shy away from things that are round as it takes so much more time to build around round as it does square. (for me anyway)

How Interesting, I've often thought of containers before but the insulation always seems to be a problem, underground is a whole different story though, perhaps some type of coating is necessary before you stick dirt on top of them
I would only place a relatively small measure of dirt on top, no more than 5 feet

Recently was reading about this concept on another list. It turns out that the frame at the perimeter of the containers are very strong. This gives them there ability to be stacked on top of each other many many layers high. However the sheet metal on the roof will not support much weight. In other words very little load (dirt) can be placed on top inbound of the edges.