![]() Precast: The slabs are made somewhere else and then brought to the site and assembled.In situ: Formwork construction and pouring of concrete occur on site, then the slab is assembled (if required).This process may occur in three different approaches, however the basic method is the same in each: First the supports are built, then the pods are arranged in place, and finally the concrete is poured. The formwork is made up of many elements: waffle pods, horizontal supports, vertical supports, cube junctions, hole plates, clits and steel bars. There are two types of waffle slab system:Ī waffle slab can be made in different ways but generic forms are needed to give the waffle shape to the slab. ![]() Waffle slabs are composed by intricate formwork, and may be more expensive than other types of slabs, but depending on the project and the quantity of concrete needed it may be cheaper to build. It is also used in buildings that require big open spaces, like theatres or train stations. ![]() This type of structure, because of its rigidity, is recommended for buildings that require minimal vibration, like laboratories and manufacturing facilities. This structure was designed to be more solid when used on longer spans and with heavier loads. The grid is formed by the removal of molds after the concrete sets. A waffle slab is flat on top, while joists create a grid like surface on the bottom.
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