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What is raft foundation?
A raft or mat can be considered as a combined footing which covers the entire building area and supports all columns and walls. Such a foundation may consist of a slab of uniform thickness or a slab stiffened by beams either above or below the slab as demonstrated in figure as:
RAFT FOUNDATION
When the allowable soil pressure is low or the building loads are heavy, the use of individual spread footings would cover a major portion of the plan area. When the total area of the footings covers more than fifty percent of the area, it is more economical to use a raft for the entire structure.
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