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Building means a comb!ion of materials to form a construc- tion that is safe and stable, and adapted to permanent or continuous occupancy for public, institutional, residence, business or storage purposes; the term "building" shall be construed as if followed by the words "or part thereof." For the purposes of this code, each portion of a building separated from other portions by a fire wall shall be considered as a separate building. Building official means the officer or other designated authority charged with the administration and enforcement of this code, or his duly authorized representative. Fire resistance rating means the time in hours that the material or construction will withstand the standard fire exposure as deter- mined by a fire test made in conformity with the "Standard Methods of Fire Tests of Building Construction and Materials," ASTM E119-47. Dwelling means a building occupied exclusively for residence purposes and having not more than two apartments, or as a board- ing or rooming house serving not more than 15 persons with meals or sleeping accommodations or both. Fire retardant ceil~ng means a ceiling construction which has been proved by test as satisfactory for use as ceiling protection for a floor or roof construction which has a fire resistance rating of not less than one hour. Fire retardant treated lumber means lumber which has been treated by a pressure impregnation process to give a flame spread classification of 50 or less according to the method for the "Fire Hazard Classification of Building Materials" of Underwriters' Lab- oratories, Inc., and which is shown to be so classified by a certificate or label issued by Underwriters' Laboratories. Garage means a building, shed or enclosure, or a part thereof, in which a motor vehicle containing a flammable fluid in its fuel storage tank, is stored, housed, kept or repaired. Grade, with reference to a building, means, when the curb level has been established, the mean elevation of the curb level opposite those walls that are located on, or parallel with and within 15 feet of, street lines; or, when the curb level has not been established, or all the walls of the building are more than 15 feet from street lines, "grade" means the mean elevation of the ground adjoining the building 011 all sides. Habitable room means a room occupied by one or more per- sons for living, eating or sleeping; and includes kitchens serving apartments or individual households, but does not include bath- rooms, toilet compartments, laundries, serving and storage pantries, corridors, basement and other spaces that are not used frequently or during extended periods. Height as applied to a building, means the vertical distance from grade to the highest finished roof surface in the case of flat roofs, or to a point at the average height of roofs having a pitch of more than one foot in 4~ feet; "height" of a building in stories does not include basements, except that in school buildings of orcli- nary, noncombustible or wood frame construction. the basement 4 . . . e , . - .' . h fi '-f'h " (b). Except were roo ng IS 0 a c aracter permlttmg attach- ment direct to frame work, it shall be applied to a solid or closely fitted deck. (c). Roofings which are listed as Class A or B roof covering materials by Underwriters' Laboratories, Inc., shall be accepted as meeting the requirements of this section. (d). Roofings which are listed as Class C roof covering ma- terials by Underwriters' Laboratories, Inc., shall be accepted as meeting the requirements of this section on buildings as follows: (1) Dwellings. (2) Buildings of wood frame construction. (3) Buildings located outside the fire limits which do not exceed 2 stories or 30 feet in height, nor 2500 sq. ft in area, and are not occupied as stores, factories or warehouses. (4) Buildings which under this code could be of wood construction. Appendix re wood shingles. (e). The use of cork, fiber board or other approved insula- tion is permitted on top of the roof deck provided such insulation is covered with an approved type of fire resistive roof covering ap- plied directly thereto. (f). No roofing 0,11 an existing roof shall be renewed or re- paired to a greater extent than one-tenth of the roof surface, except in conformity with the requirements of this section. See (b). Skylights other than as specified above, ,which are in- clined less than 600 from the horizontal, hereafter placed on a build- ing shall have the sashes and frames thereof constructed of metal and glazed with wired glass; except that skylights in foundries or buildings where acid fumes are present, may be of wood by special permission of the building official. (c). Every skylight in which plain glass is used shall be pro- tected by a substantial wire screen with wire not lighter than num- ber 12 gauge and having a mesh not less than ~ of an inch nor larger than 1 inch, placed not less than 4 inches nor more than 10 inches above the glazed portion of the skylight at all points. Such screen shall extend beyond the glazing on all sides a distance not less than the height of the screen above the glazing. (d). When a skylight is located over a stairway, public hall- way or a place of assembly, a similar screen shall also be placed below the skylight, unless there is an intermediate ceiling light. (a). Skylights placed over shafts, vent shafts and stair en- closures shall be glazed with plain glass ndt more than ~ of an inch in thickness. In buildings except dwellings and one-story buildings outside of the fire limits, the ceilings over basements shall be fire retardant ceilings unless such basements are sprinklered 33 SECTION SECTION 32. 33. SKYLIGHTS. BASEMENT CEILINGS. frame ))