May well be an area thing,up in NW of England it was 200mm until recently then increased to 225mm,i very rarely build house's on anything deeper than 1000mm dig out, and can count on both hands the times i built off mass poured, usually extensions with awkward access.
Thats what confused me - i can understand a 2 storey house but its a single story with flat roof.....but then i thought ground movement/heave is still an issues regardless of what we build?
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