Contracting, constructing and repairing water-retaining structures and water resistant structures such as dams, reservoirs, storage tanks, storage pits, ponds, irrigation canals and conduits therefor; buildings and roofs; the application of waterproof membranes to buildings, the replacement of roofs and gutters, the installation of damp proof course membranes

Plastic materials in sheet, rod or block form and articles made therfrom included in this class; pipes, conduits, containers and barrels made of plastics material and parts and fittings made of plastics material in this class for pipes, conduits and containers; liners, lining and covers of plastics material for drains, irrigation channels, ditches and sewerage treatment plants

Building materials, prefabricated roofing and flooring and parts thereof; roofing membranes, roofing substrates and water proofing systems, all of the aforementioned goods made from synthetic resins.

Sheets, films, slabs and shaped sections of plastics; sheets and films of plastics laminated or otherwise combined with woven or knitted fabrics, glass fibres, plastics fibres, paper, natural or synthetic rubber, or foamed plastics or natural or synthetic rubber; self-adhesive plastics films; weldable plastics films; and materials for packing, stopping or insulating; all included in Class 17

Slabs, sheets and shaped sections of plastics for use as building materials and for covering roofs