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You want to know about movement, my house which WAS on clay and made of weather board, used to shift upto an inch between summer/winter, wet/dry. The front door had 2 positions for the lock striker plate, as the house could drift enough that you could open it one morning and not be able to close it.
Have just poured the slab for our new house, 50 piers ranging from 1-2 metres for a 180sqm slab. Even then, that is also why they use a waffle framework for the slab to minimise the contact points with the clay.
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