O-1954-476 - Laserfiche WebLink

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e t t -, . -40- . 4. ENCLOSUHE AT . 'lOP . (a) Shaft enclosurl~s extending through the roof 'Which are to be en- closed at the top, shall be provided with a skylight of at least 10 per cent of the area of the shaft in the "jOP story and glazed with plain glass liB-inch in thickness; provided that the :Jkylightmay be replaced by a window of plain glass of equivalent area in the sidH of the shaft if the sill of such window is not less than 2 feet above the roof and the "dIldOVI' does not f ace a lot line wi thin 10 feet, or may be replaced by approved means of ventilation. (b) A shaft that does not extend through the roof shall have the top enclosed with a form of const!:-uction having a fire resistance rating equal to that of the walls of the shaf"~. 5. ENCLOSURE AT BO~rTOM. A shaft that does not extend to the bottom of the building shall be encl.)sed at its lowest point with a floor construction of the same type as that required for the lowest floor to or through which it passes, but such shaft floor t~onstruction shall have a fire resistance rating of not less than one hour. 6. ELEVP.Tffi MACHlN:m.y COMPARTMENT. Compartments aontaining machinery for operating elevators shall be separated from the elevator shafts by noncom- bustible construction having .3, fire resistance rating of not less than 2 hours, wi'th door openings equipped w:Lth approved fire doors. 7. NUMBER OF Er,E,VK~m S IN SHAFT. Not more than 3 elevators shall be placed hereafter in one shaft. SECTION 34, ROOFING. . (a) Every roof herB~ter placed on a building shall be covered with an B:pproved roofing of b::'ick, concrete, tile, slate, metal, asbestos, pre- pared asphalt asbestos-felt s:1ingles, or of built-up roofine finished with asphalt, slag or gravel, or other appr:>ved material, except that dwellings, private gar'ages, and barns separated by at least twelve feet from other buildings may be roofed with a good grade of wood shingles. (b) Except lmere r:>ofing is of a character permitting atta.chment direct te, frame 'Work, it shall be Bf>:?lied to a solid or closely fitted deck.(c) Roofings which are listed as Class A or B roof covering materials by' Underwriters r Laboratories, Inc., shall be accepted as meeting the requirements of this section.