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When pouring slabs, you should have a bond breaking material placed between the slab and footing.
For foundation walls, control joints should be be provided in foundation walls more than 25m long at intervals no more than 15m.
I can't remember what its called, but when we poured slabs, we would put a 2"x4"x8' flexible material around the whole perimeter of the building, placed right at the top of the slab. The concrete wouldn't bond to it, making it extremely hard for the concrete to crack at the joint of the slab and wall.
For garages and basements we would put a control joint 1/3 of the depth of the slab, right down the middle, on both sides.
-Bill
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