Transportable buildings (chiefly of non-metal); buildings (chiefly of non-metal); non-metallic transportable buildings; non-metallic buildings; building materials (not of metal); construction materials (non-metallic); pipes (non-metal); doors (non-metal); door frames (non-metal); walls (non-metal); wall panels (non-metal); wall cladding (non-metal); insulation (non-metal); fencing (non-metal); building systems and kits (chiefly non-metallic components); concrete; concrete slabs; concrete panels; building panels (non-metallic); plasterboard panels; gypsum; panels and building components made from gypsum; wall, roof and ceiling panels (non-metallic); roof coverings, flashings, and trusses (non-metallic); structural insulated building systems in this class