19 Non-metallic building materials for roofs, namely, non-metallic tiles, slates, underlays, felts, asphalt, shingles, sealants; non-metallic gutters, ridge and hip caps, valley tubes and flashing, ventilation units, vent pipes, windows, skylights, insulation, abutments, eaves, and snowguards; non-metallic roof outlets; non-metal building materials, namely, safety systems comprising walkways and roofsteps