19 Building and construction materials not of metal, namely, pressure-treated lumber, plywood, and other wood products, namely, timbers, roofing shakes and shingles, stair heads, stair jacks, stair risers, railing, decking, lattices, spindles for stairs, handrails for stairs, posts, balusters for stairs, insect screen panels, fence panels, gazebos, gates, post tops and caps for fences, lawn edging, foundations, posts and poles for fences, soffit and fascia, floor joists, pilings, window sill plates, window sashes, header beams, sheathing board, trim, girders, pre-fabricated nonmetal architectural columns, hardwood flooring and subflooring, rails, siding, rafters, studs, ceilings; wooden landscaping materials, namely, wooden tiles for use in constructing walkways, patio squares being wooden tiles, and fencing; semi-worked wood impregnated or otherwise treated with chemicals to impart to the treated wood resistance to fire, decay, dry rot, termites, and other wood destroying agencies