19 PREFABRICATED NONMETAL BUILDING MATERIALS-NAMELY, (( ROOFING AND ROOFING PAPER OF SYNTHETIC MATERIAL OR BITUMEN, STRUCTURAL PROFILES, COVERINGS FOR VERGES, ROOF EDGE TRIM, FLASHING, ROOF DRAINS, )) HATCHES, (( ROOF VENTS, CHIMNEY CAPS, )) SKYLIGHTS (( AND ROOF AND/OR TERRACE SUPPORTING COLUMNS ))