Design and decoration

A waffle pod is a polystyrene mould which comes in several sizes and all are x 1.090mm. 175mm for an A class slab 225mm for an S class slab 300mm for an M class slab 375mm for an H class slab The waffle pod takes the part of form work to help internal beams in the slab. With a conventional raft slab you would need to form the pads up out of packing clay and consider excavation between the pads.
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Concrete base is a rock based material placed and levelled under the polythene prior to the form work and reinforcing then concrete.  See attached photo shows the base, which is crushed rock and is around 50mm to 100mm thick. The need for a smaller aggregate with rounded edges, so the perforation to the polythene is avoided. If a raft slab is being used the use of rock material is not used packing sand takes it's place to form the pods.
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