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Where the self weight of the overall slab needs to be considered, the quantity of in-situ concrete required can be reduced by fixing polystyrene void formers to the OMNIDEC panels during manufacture. The void formers are normally 400mm wide and are fixed between the lattice girders, which are cast at standard 600mm c/c.
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As the spacing of the lattice girders are fixed at 600mm in an OMNICORE panel, most OMNICORE panels would need propping for spans over 2.5m.
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The amount of concrete displaced by the polystyrene varies on each contract as a result of those areas of slab over and around supports, which are required to be cast as solid slabs.
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N.B. We would not recommend power-floating the in-situ portion of an OMNICORE slab due to differential drying across the polystyrene/in-situ.
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