Building materials and components not of metal; non-metallic materials for use in building or construction, including the following, all of which are not of metal: architraves, boards, cavity barriers, door casings, joinery products; jointing materials, mouldings, panels, partitions, planks, profiles, skirtings, walls, window frames, window guards, window surrounds, prepared wood; artificial, simulated and imitation wood and timber; decorative products used in the building industry such as room archways, staircase rails and fireplace surrounds.