Doubt it.. only if you have a single skin wall with a high load.. extremely rare on single dwellings.. all to do with 45deg line from point of load needs to be outside the base area or you need to check for punching shear..Static, For all domestic jobs with trad construction I've been specifying 600x200 (750 to U/S) unreinforced foundations since I don't know when, never had it rejected by BC and nothings fallen down AFAIK should I be worried?
agreed.I think what you are trying to ask is how deep should the concrete be? If that is the case 9 inches would be fine.
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