<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> A concrete slab is a common structural element of modern buildings . Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving . Sometimes these thinner slabs, ranging from 2 inches (51 mm) to 6 inches (150 mm) thick, are called mud slabs, particularly when used under the main floor slabs or in crawl spaces . </P> <P> In many domestic and industrial buildings a thick concrete slab, supported on foundations or directly on the subsoil, is used to construct the ground floor of a building . These can either be "ground - bearing" or "suspended" slabs . The slab is "ground - bearing" if it rests directly on the foundation, otherwise the slab is "suspended". For double - storey or multi-storey buildings, the use of a few common types of concrete suspended slabs are used (for more types refer to the Concrete Slab #Design section below): </P> <Ul> <Li> Beam and block also referred to as Rib and Block, are mostly used in residential and industrial applications . This slab type is made up of pre-stressed beams and hollow blocks and are temporarily propped until set, typically after 21 days . </Li> <Li> A Hollow core slab which are precast and installed on site with a crane . </Li> <Li> In high rise buildings and skyscrapers, thinner, pre-cast concrete slabs are slung between the steel frames to form the floors and ceilings on each level . Cast in - situ slabs are used in high rise buildings and huge shopping complexes as well as houses . These in - situ slabs are cast on site using shutters and reinforced steel . </Li> </Ul>

Difference of suspended slab and non suspended slab
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