Building materials including pressure dampers, expansion jointing materials, piping materials, inflatable pipe stops and formers, tiles, and tapes; roofing, roofing materials including roof tiles; roofing membranes; barrier membranes; membranes and barriers for building and/or construction purposes; membranes and barriers for use in the containment and/or separation of gas or gases, for use in waterproofing and/or damp-proofing, for bridge deck waterproofing, for tanking of foundations and for baffle curtains; linings; products having lining and/or containment applications including linings for pools, effluent pits, canals and/or reservoirs and for use as lifting bags; liners for ponds, pools, slurry pits, silage pits, lagoons, irrigation ditches, drainage ditches, gullies, tanks, for effluent containment and treatment systems, silos and landfill sites; liners for bunds; waterproofing materials for building and/or construction purposes and/or for roofing; parts and fittings for all the aforesaid goods