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Marty
 
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Default Concrete patio and clay soil: preventing cracks

We live in Northen California north of San Francisco.
Our temperatures range from the 30's at night in the winter to the 70's and
80's in the summer with occasional periods of 90's.
Our rainfall ranges from not a drop of moisture for months to constant
daily rain for months.
Our soil is pure clay with tons of shrinkage and expansion.
And we've got earth movement from the occasional tremor (earthquake-style).

Is there such a thing as a concrete patio that won't crack and split over
time?
What's the best preparation that will minimize cracking and shifting given
the conditions described above?

Thanks