Raft Foundation

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a raft foundation (also known as a mat foundation) is a monolithic slab, very thick (often 4' to 6'), upon which [[foundation]] walls are placed. the entire system is caged with rebar, which protrudes above upon which the column grid is set. Often, to stiffen the slab, a grid of ribs is cast underneath it. Also, to reinforce a certain spot (in order to accept a point load, for example), the slab can be cast thicker; this is known as a haunch.

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