Building materials (non-metallic), namely grilles, gratings, guard rails, skylights, rafters, frameworks, valances, shingles, tiles, slates, thatch, gutters, conduits, down pipes, gutter pipes, drain pipes, doors, shutters, windows, cladding, joists, columns, studding, door mats, door cases, window casings, door casings, window frames, door frames, verandas, steps, cornices, supports, canopies
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