Polystyrene Roof Slabs

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Polystyrene roof slabs.

A filter fabric is placed on top of the polystyrene. Engineered for use on heavyweight decks e g. The major advantage of ribbed slab with permanent blocks is the reduction in the quantity of formwork required given the fact that strength of the blocks is normally not assumed to contribute to the strength of the slab in design. The raw material is heated in special machines called pre expanders with steam at temperatures of between 80 100c.

The polyroof insulation boards are cut and tightly packed on top of the waterproofing layer. Reinforced concrete with a ballast layer of gravel or concrete slabs styrofoam brand roofmate insulation helps the roof membrane maintain a steady temperature minimizing the harmful effects of freeze thaw cycles weathering and physical damage during and after construction. A 50mm layer of stone is placed on top of the filter fabric to ballast it. In nigeria clay hollow pot and sandcrete blocks have been successfully used but on the rise is the polystyrene.

The density of the material falls from some 630kg m3 to values of between 10 and 35kg m3. The concrete slab is cast step 2. A screed to fall layer is cast on top of the slab for run off step 3.