ducts, not of metal, for ventilating installations; plastic conduits for drainage; plastic water conduits for balconies; water-pipes, not of metal; floor boards of plastic; dado rails of plastic; building boards made of plastic; building strips of plastic; plastic water conduits for terraces; landscape edgings of plastic; entrance doors, not of metal; flooring underlayment; artificial stone; building materials of artificial stone; pre-fabricated log homes; paving slabs, not of metal; pilings, not of metal; moldable wood; ornaments made of artificial stone; non-metal doors