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390 Sea. 20. F16or lights. Except iii dwellings, all openings hereafter made in floors for the trans_ mission of light to floors below, shall be covered with glass set in metal frames a"d bars, The glass shall be not less than 3/4 inch in thickness, and if any glass measures more than sixteen (16) square inches there shall be a rigid wire mesh either in the glass or under it, ec. 21. Light, vent, and dumb -waiter shafts. (a) In every building hereafter erected or altered, except frame buildings, all walls or partiti6ns forming interior light or vent shafts shall be built in accordance with the requirements for stair and elevator shafts in new buildings as specified in sec. tion 17. The walls of dumb-waitershafts, except those in dwellings which extend only one story above the basement or cellar, shall be of fire -resistive construction, and shall be not less than 3 inches thick if constructed of brick, hollow or solid partition blocks, or of steel studding and metal lath with 3/4 inch of Portland Cement plaster on each side; or a 2 inc4 solid metal lath and Portland Cement plaster wall may be permitted, if securely anchored at each floor. The material and method of construction to be as specified for stair and elevator shafts in buildin je in Section 17. (b) In frame buildings outside the fire limits the enclosure partitions of all such shafts may be constructed as provided in Section 17 for stair and elevator shafts in existing buildings. (c) Where a dumb -waiter shaft does not extend through the roof the top of the shaft shall be of fire -resistive con6truction of the same thickness as the walls of the shaft. (d) All openings in dumb -Baiter shafts shall be protected by fire doors mounted in incombustible frames securely anchored to the walls. (e) The walls of all light and vent shafts hereafter erected shall extend not less than 3 feet above the roof level, except that when a shaft is covered by an in- combustible ventilation skylight the walls need not extend more than 2 feet above the roof. Masonry walls shall be properly coped. When i$etal louvres are used for ventilation purposes, the louvres or elate shall be riveted to the metal frame. Sea. 22. R)of covering. (a) All buildings except those specifically mentioned in Paragraph "b" of this section shall have roof coverings of standard quality, such as. Brick or concrete surface. Clay or Portland Cement tile. Tin or slate. Asbestos shingles 1/8 inch thick or thicker. Pitdh or felt, built-up type, four or five plies, gravel or slag surfaco• Asbestos -Asphalt, built-up type, four or five plies, smooth or grit 8II1f6ae' Vb1 All of the following classes of buildings may be covered with coverings set forth above in Paragraph "a" of this section, or with standard Asphalt -Rag -Felt Prepared roofing, or asphalt -rag g -felt shingles, or by other types of covering having equivalent fig' ChicaB�� resistive properties when approved and labeled by the Underwriters Laboratories, Ino', I11. DWELLINGS* FRAME BUILDINGS. JRuildings not exceeding two stories, or 30 feet in height and 2,500 sQuare deet in area, and not used for factories, ware houses, or mercantile purposes.