Building materials, structures and products; blocks for building and construction; prefabricated walling; wall panels; building panels; panel boards; building partitions; panel mouldings; loading and non-loading panels; walling systems; roofs; roof construction materials; roofing materials; roof tiles; roof panels; floors; floor boards; floor panels; floor tiles; materials for making floors; stairs for use in buildings; staircases; stairways; stair components; ceilings; ceiling installations; ceiling boards; materials for use in ceiling construction; parts and fittings for the aforesaid; all of the aforesaid goods being wholly or principally non-metallic.;