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    Dominic Filosa

    Not so much.  While a raft/mat foundation is a type of concrete slab on grade, it is used to support loads like a conventional concrete footing would in that it distributes the load to the soil below, only over a much larger area.  Think of it like a very big spread footing.  A typical slab on grade does not support loads and is the concrete put down between footings (which support the load).  

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    Yi Li

    thats very clear! thanks

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