Jafo,
How did you do your concrete footings?
My contractor friend spend a day there with his trackhoe and put a bunch of hard fill where the platform was going to go and compacted it. Then he drove rebar 5' down into the fill and centered the top of the rebar through some footer block. He then filled the block with cement. So far no heaving, but will know more in the Spring. He guaranteed it for 10 years.
