Arizona republican., 1916-02-17

inches where constructed of hollow terra cotta or gypsum blocks.
 Sect. D. Construction of floors. Ev- ely floor in any building or structure of class A shall be constructed of re- inforceG terra cOtta and brick, rein forced concrete and brick, reinforced terra cotta. or reinforced concrete, in either of which event the proper pro vision shall be made by metal rods protecting against the spreading of the beams. The flanges of the beams o: girders shall be protected by at least one inch of concrete or tile. The top of every arch in floor construction shall be filled with concrete to level of one inch above the beam tops: if wood sleepers are used for the purpose of laying finished floors. said sleepers shall be filled between with concrete or other -combustible material. Sect G. Elevator Shafts All ele- vators in buildings or structures of class A shall be enclosed in a parti- tion or shift extending from the basement floor to the underside of the ceiling of the top floor. All doors to such enclosure partition or shaft shall be constructed of metal, or if wool then covered with metal. All glass in , such enclosures. or doors, shall be wired glass not less than one fourth of an inch thick, set in metal frames and sash.
 Sect. :. Fire proofing. In every
 building or structure of class A all
 st, I,
 be of n-inflammable material, and
 all interior construction metal therein, except the frame for elevators and staircases, shall be protected from rust and fire by brick, terra cotta or con-
 crete as follows: All structural steel
 or iron, before being fire -pronfed shal!
 be cleaned of dirt, and unless encased in concrete, shall be coated with ar efficient preservative; all iron and steel columns, girders and beams, in cluding the Jugs and brackets for same.
 used in the construction of any fire
 proof building or structure or sup
 porting any fire proof floors or ma
 sorry walls, shall be entirely covered | with two inches of well-burnt clay products, laid in cement mortar or
 concrete, built in solid to the metal
 The extreme outer edges of Jugs. ! brackets and similar supporting metal shall be covered with at least one inch | of fireproofing; provided, that where
 steel trusses are used to support COIL
 crete or tile, or hollow tile roof Of
 class "A buildings or structures, and
 the lower cord of the roof trusses be
 at least twenty-five feet above the
 nearest floor of any such building. and there be no room or rooms, structure
 CT structures, excepting the roof above , such trusses. and such trusses be pro- | tected from fire by means of a ceiling
 constructed of steel ribs. metal lath
 and fireproof plaster, the fireproofing
 as described in this section may he
 omitted provided. however, that the
 lower cord Of such trusses shall be
 wrapped with metal lath and plas-
 tered with cement or fireproof plaster
 to thickness of not less than three l fourths of an inch. Where, however ; such fireproof ceiling is twelve inches 1 or more below such lower cord of such | trusses. then and in that case. such ! metal lath and plaster on such lower
 cord shall not be required
 Provided further that where steel
 roof trusses De used to support the i roof of any class A building or structure. and no structure except the roof of such building or strtr- ture be constructed or main
 tained on or over such roof trusses.
 and no structure other than. a balcony not more than ten feet in width below | such roof truSses, and each of sucl 1 trusses be placed not less than forty
 feet above the floor of the building
 or structure or portion of the building
 or structure over which such roof
 trusses be erected or constructed, then
 in that event, the fireprOofing pro-
 yided for in this section shall not be
 required.
 In hollow tile blocks more than six
 inches thick, the shells and webs
 thereof shall not be less than three fOurths of an inch thick. Such blocks | shall he thoroughly tied and anchored
 together.
 Sect. S Stairways. Every building
 or structure of class A shall have at
 least one interior stairway from the
 ground to the roof, and all stairways !, shall be constructed of fireproof ma terlai throughout.
 No stairway shall surround or be adjacent to an elevator or open well
 hole unless separated from such shaft
 or hole by partition or wall of fire | proof material, or unless there be in
 such building or structure another in 1 terior stairway from the ground to the
 roof not adjacent to an elevator shaft
 or well hole. In no case .,hall any
 floor of more than ten thousand square feet of area have less than two interior stairways from the top floor
 to the second floor of any building or structure. Sairways from the first floor to any basement or portion
 thereof used only for storage or for
 the maintainance of service for the building or structure. shall be con { st:ucted of fireproof material through
 cut. and shall be enclosed in fireproof walls or partitions having tight
 metal door or if a wood door then
 metal covered. and containing no | glass, other than wired glass. not less
 than fourth of an inch thick. Sect 9. Roofs. All roofs of build | irgs and structures of class "A shall he constructed of concrete, brick !, arches or tile, the upper surface of
 VI hich shall be covered with asphaltum
 and gravel cement. concrete. tile or
 other fireres;sting composition rooc-
 ing.
 | Sect. 10. Skylights. Skylieht frames
 on buildings of class. "A" construction l shall be constructed entirely of metal. and all such skylights shall be glazed
 with wire glass not less than one
 fourth of an inch thick. and no lights
 therein shall be larger than sixteen