The waffle slab foundation does not require any type of moisture barrier or capillary break, because the slab sections are above grade typically 12.5 to 16 inches.įrom the other post-tension slab type the current design practice provides equal stiffness post-tension on grade slab that is a better technique. From differential swelling resulting, the waffle slab foundation needs resist strength like surface drainage, landscaping practices, or flooding from any source.Īnd also, this type of foundation has a good sign, that is it is not to required pre-soaking underlying soil pads and also is not required of footing, which indicates there are no earth spoils. With the cross-section provided, the waffle slab foundation is very stiff. After that on this box poured the post-tension reinforced concrete over the boxes to complete the total process.įor soil movement, the slab allows underneath with the void areas, and at last as a raft, the total slab is resting on the ground. To construct a waffle slab foundation at first, we have to place a plastic form of waffle box in series, which is 19” X 19” in plan and height either 8.5” or 12”. The waffle slab foundation is constructed above the ground like a mat foundation and is also used to provide a load-bearing capacity on expensive, compressible, rocky, or hydro collapsible soil.
The waffle slab foundation system is also called a waffle mat foundation.
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