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<br />be provid~etween such door and such
<br />
<br />e
<br />
<br />such door, shall
<br />
<br />of
<br />
<br />width
<br />stairs.
<br />
<br />(e). Where the size of the exit doorway requires two doors in
<br />the same opening, the doors shall be so hung as to require no center
<br />post in the opening for the doors to close against.
<br />
<br />14. Lighting. Required stairways, hallways and other means of
<br />exit, including exterior open spaces to or through which exits lead,
<br />shall be kept adequately lighted at all times that the building served
<br />thereby is occupied.
<br />
<br />".
<br />
<br />e
<br />
<br />3. Structural members. ~I structural members shall be of
<br />steel, iron, reinforced concrete, or of other approved noncombustible
<br />materials.
<br />
<br />.
<br />
<br />SECTION 16. FIREPROOF, SEMIFIREPROOF AND
<br />HEAVY TIMBER CONSTRUCTION.
<br />
<br />Fireproof, semifireproof and heavy timber construction shall
<br />conform to generally accepted-good practice. The 1949 Edition of
<br />the National Building Code recommended by' the National Board
<br />of Fire Underwriters shall be deemed the generally accepted good
<br />practice for these types of construction.
<br />
<br />4. Partitions.
<br />(a). If combustible material enters into the construction of
<br />partitions, they shall be built to have a fire resistance rating of not
<br />less than one hour; but this shall not prohibit the use of wooden
<br />doors, door casings, frames, jambs and bucks, window and transom
<br />frames and casings, unless the partitions are required to be fire
<br />partitions. "
<br />(b). Nothing in this section shall prevent the erection of tem-
<br />porary partitions of wood and glass or of metal and glass within
<br />the rooms or spaces occupied by a single tenant.
<br />(c). All permanent partitions shall rest
<br />materials.
<br />
<br />noncombustible
<br />
<br />on
<br />
<br />SECTION 17. ORDINARY CONSTRUCTION.
<br />
<br />1. Definition. Ordinary construction, as applied to buildings,
<br />means th~t in which exterior walls and bearing walls are of masonry
<br />or of reinforced concrete, and in which the structural members, in-
<br />cluding columns, floors and roof construction, are wholly or partly
<br />of wood of smaller dimensions than required for heavy timber con-
<br />struction, or of steel or iron not protected as required for semifire-
<br />proof construction.
<br />
<br />WOOD FRAME CONSTRUCTION.
<br />
<br />1. Definition. Wood frame construction, as applied to build-
<br />ings, means that in which walls and interior construction are wholly
<br />or partly of wood.
<br />
<br />19.
<br />
<br />SECTION
<br />
<br />2. Walls.
<br />(a). Exterior walls and all bearing walls shall be of
<br />or of reinforced concrete.
<br />(b). Exterior walls which are within 3 feet of a lot line along
<br />an adjoining area which is or may be built upon or which are within
<br />6 feet of another building of other than fireproof or semifireproof
<br />construction on the same lot, shall have a fire resistance rating of
<br />not less than 3 hours; except that where the total area of the build-
<br />ings does not exceed 10 times the allowable area for anyone of the
<br />buildings considered such fire resistance rating shall not be required.
<br />
<br />masonry
<br />
<br />.
<br />
<br />.
<br />
<br />3. Beams, girders and joists.
<br />(a). Wooden beams and joists, except headers and tail joists,
<br />and except for bearings at joints limited within the allowable
<br />stresses provided in this code, shall have bearings of at least 3
<br />inches in length.
<br />
<br />(b). Wooden trimmers, headers, and tail joists over 6 feet in
<br />length, unless supported on walls or girders, shall be hung in ap-
<br />proved metal stirrups or hangers. If wood girders are set flush
<br />with the floor joists, the joists shall rest in approved metal stirrups
<br />or hangers. The ends of joists against the girders shall be securely
<br />nailed to the girders.
<br />
<br />(c). Except in the case of pitched roofs, wooden floor and roof
<br />joists having spans in excess of 8 feet shall be rigidly braced with
<br />continuous rows of bridging at intervals not exceeding 8 feet.
<br />
<br />17
<br />
<br />2. Walls.
<br />(a). Framing for exterior walls shall be constructed to develop
<br />a strength and rigidity equivalent to wooden studding, not less than
<br />2 by 4 inches, nominal dimensions, spaced 16 inches on centers with
<br />the larger dimension perpendicular to the wall, and braced with
<br />sheathing or diagonal bracing at the corners to secure the necessary
<br />ri"gidity; except that in one-story buildings studs not over 10 feet
<br />in length may be spaced not to exceed 24 inches on centers.
<br />(b). In buildings except private garages, an exterior wall
<br />wh~ch is less' than 3 feet distant from the lot line along an adjoining
<br />area which is or may be built upon shall be of noncombustible con-
<br />struction having a fire resistance rating of not less than two hours;
<br />except that the material of the weather surface may be similar to
<br />that of other exterior walls of the building.
<br />(c). An exterior wall which is less than 6 feet distant from
<br />a wall of another building of wood frame construction on the same
<br />lot, shall be of noncombustible construction having a fire resistance
<br />rating of not less than two hours; except that the material of the
<br />weather surface may be similar to that of other exterior walls of
<br />the building; and except that when the aggregate area of the two
<br />buildings does not exceed 10 times the limiting area fixed by this
<br />code for either building, such fire resistance rating shall not be
<br />required.
<br />
<br />.
<br />
<br />.
<br />
<br />3. Stucco.
<br />(a). Stucco shall consist of portland cement mortar or other
<br />approved mortar, on approved metal lath, or other approved backing.
<br />(b). Stucco shall be kept at least 8 inches above adjacent
<br />ground surfaces, with sills, coping and other projecting courses pro-
<br />vided with drips.
<br />
<br />20
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