beams made of wood; beams, not of metal; non-metallic nail plates in the nature of reinforcing materials for the assembly of roof trusses; non-metal hips for roofing; non-metallic composite materials for use in roofing, namely, manufactured, building, and construction timber and lumber; non-metallic composite roofing materials for use in roofing, namely, beams and trusses; non-metallic building materials for roofs, namely, timber trusses, structural beams, non-metal metallic composite timber ...