We don't have much frost, but most of Adelaide is built on Clay. In my current rental I can watch cracks open and close a few millimeters with the dry and wet times. It is only really noticeable where it had got a bit wide and the landlord had it filled and painted. Then we had good rains for a year or so and the crack has tried to close up, causing a mini-mountain range to pop out of the wall. 
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Shut up and hug. MoreThanPretty, Nov 5, 2008.
Just because I'm nominally polite, does not make me a pussy. Sundae Girl.
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