Down here the best foundation you can use is called post tension. Instead of laying rebar down in the concrete, troughs are dug going both vertical and horizonal and these long cables are laid out that actually stick out the sides of the foundation which are tightened about 3 days after the concrete is poured. Technical huh???... Yep - it is Greek to me too, but it is suppose to be much stronger and costs about the same... so it was a no brainer which one to pick!
You may need to doube click on the picture to see ..