Meir Roofing

Expanded polystyrene boards are formed by a steam heated process which expands the beads of polystyrene and fuses them into a slab. Boards are available in various grades and are available with a pre-felted upper surface factory bonded fibreboard or Perlite board for use in roofing applications which has the dual function of shielding the expanded polystyrene from hot bitumen and asphalt and absorbing the thermal movement sufficiently to permit a fully bonded built-up roofing system. Expanded polystyrene boards exhibit large thermal movement and are heat sensitive. The boards cannot tolerate the temperatures which arise from the direct application of hot bitumen or asphalt and indirect laying techniques have to be adopted by applying coat hot bitumen to the substrate and allowing it to cool to a tacky condition before the expanded polystyrene is laid or a colds applied adhesive is used. The boards are available as a constant thickness or tapered to provide falls.