19 [ Non-metal building materials, namely, ceiling and door panels, plaster and plaster boards; non-metal separating and protective rails for building; formwork for building, of plastic or mineral building materials; ] pipes of plastic for building; [ non-metallic partitions, aprons, plinths, lining boxes, gutters, door and window soffits, ramps, steps, lintels, frames, and place holders for retrofittings; ] non-electric conduit channels and pipe boxes for moist environments; [ protective grilles in the nature of grates; ] floor drains of plastic; bulk and/or mouldable cementitious building materials, namely, resins, grouts, mortars and plasters of plastic and/or silicates, for making components, markings and coatings; coating layer carriers, namely, backerboards of plastic or ceramic materials; wall and floor tiles of stoneware and/or natural stone; ceramic wall, counter and floor tiles, glass wall, counter and floor tiles, stair riser edge profiles and surround profiles for balconies or terraces, all goods of plastic; semi-finished goods of ceramic materials, in mat, tile, profile, rod, element and block form in the nature of building materials; casings, namely, door frames not of metal and window frames not of metal; accessories for laying wall and floor coverings, namely, frames, rails, consoles in the nature of structures and profiles for delineating wall and floor coverings; plumbing pipes [ and gutters ], namely, drain and supply pipes [ and drain gutters ]; floor drains [ and traps, all the aforesaid goods ] not of metal; intermediate panels, namely, tile-ready and construction panels [ ; non-metal ventilation ducts for air conditioning, heating and cooling ]