Im building a 7 x 7m garage. I was doing a cavity wall and was advise to do the foundations 600mm wide and 800mm deep using an ST3 concrete. Im now doing a single block with piers. Can anyone suggest what width and depth foundation I should use, Im presuming it will be smaller.
Also how thick should my hardcore be for the oversite?
The depth and size of you foundations will depend on sub-soil conditions. If your garage is sited on made-up ground the foundations will need to be a lot wider and deeper when compared with those if you hit bedrock.
Hardcore depth will also depend on soil conditions - make sure the hardcore is well broken up and compacted.
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