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§ 1567.08 DWELLING HOUSE CODE 70 (c) Installation requirements. Sheathing shall fit tightly around all door and window frames, with all ends over supports and with vertical joints staggered. At openings, water- resistant paper shall be applied to provide a seal between the opening frame and the gypsum sheathing. (d) Exterior finish. Wood or slate shin- gles applied over gypsum sheathing shall be fastened to woad strips or other approved backing or nailing strips, Approved fas- teners may be used far the direct attach- ment of..cement-asbestos siding or cement- asbestos shingles to gypsum sheathing. 1567.08 ~Sheathingpaper. (a) Character. Sheathing paper shall be water-resistant building paper or asphalt- saturated felt. The vapor resistance of sheathing paper shall be less than that of the material used on the inside of the wall as stipulated in Chapter 87. (b) Installation. Sheathing paper shall be applied so as to lap not less than 4 inches at all joints. Except as set forth in subsection (c) and (d) of this section, strips of sheath- ing paper, at least 6 inches wide, shall be in- stalled behind exterior trim of all exterior openings. (c) Omission over waterproofed sheath- ing, Except behind masonry veneer or stucco exterior finish, sheathing paper may be omitted over gypsum board and fiber- boardthat has been factory treated to render itmoisture-resistant or water-repellent, pro- vided: i, all edges of such board which are cut after treatment shall be calked with elastic waterproof calking material or protected with strips of water-resistant building paper or asphalt-saturated felt; ii, the bottom edge of the sheathing board at the head of openings shall be so located as to permit the head flashing to extend un- der the sheathing and to be turned up behind the sheathing; and iii, the joint between the sheathing board and the head flashing shall be calked. (d) Other possible conditions for omis- sion. The Building Official may approve the omission of sheathing paper where the build- ing is not intended for human occupancy, or where the exterior finish is metal, and in other instances where it is not deemed neces- sary by him for the protection of the sheath- ing or structure. CHAPTER 69. EXTERIOR WALLS OF MASONRY. 1569.01 Bracing. (a) Intervals. Masonry walls shall be braced, either horizontally or vertically, at right angles to the wall face at such distances that the ratios of ,distance to wall thickness shall not exceed those given in the following TABLE: Maximum Ratio of Unbraced Height or Length to Type of Masonry Thickness Plain Solid Masonry; Stone Ashlar Type A, B, or C Mortar ________ 20 Type D Mortar _______________ 12 Grouted Solid Masonry: Type A or B Mortar and grout ________ 22 Hollow Walls of Masonry and Walls of Hollow Masonry Units 18 Cavity Walls: Type A or B Mortar 14 Plain Concrete (2,000 psi mini- mum) ----------------------- 22 (b) Acceptable methods. Bracing may be obtained by cross walls, piers, structural steel or reinforced concrete columns, or but- tresses when the limiting distance is meas- ured horizontally, or by floors or roofs when the limiting distance is measured vertically. Bonding or anchorage shall be provided be- tween the walls and the bracing to resist the assumed wind force, acting either inward or outward. Except for permissible chases and recesses, walls shall not vary in thickness between their lateral supports. 1569.02 Plain solid masonry. Plain solid masonry bearing walls shall be not less than 8-inch nominal thickness when not over 35 feet in height. In one-story single family dwelling houses, one-story pri- vate garages and similar structures, plain solid masonry bearing walls may be of 6- inch nominal thickness when not over 9 feet in height or 15 feet to the peak of the gable. 1569.03 Plain concrete. The minimum thickness of walls of plain concrete shall be that stipulated in Section 1569.02 for solid masonry walls. Horizontal reinforcement shall be placed from 1 to 2 inches above and from 2 to 3 inches below all openings, and shall extend not less than • ~ s • 55 Doors; Stairways Cast-iron bearing plates shall have a mini- mum thickness of 1 inch. 1547.05 Erection of cast iron columns. (a) Flanges. Where cast iron columns rest one on top of another, the top flange of the lower column shall project on all sides at least 3 inches from the outer surfaces of the column, and the shape and dimensions of a bottom flange of the upper column shall be the same as those of the top flange of the lower column, Flanges shall be at least 1" in thickness when finished, and shall be re- inforced by fillets and brackets, (b) Bolt Holes. All holes in cast iron columns shall be drilled. The diameter of bolt holes shall be not greater than the di- ameter of the bolts plus 1/16 inch. (c) Joints. Cast iron columns shall be machine faced at the end to a true surface perpendicular to the axis. They shall be bolted together with at least four bolts, 3/4 inch or more in diameter, passing through § 1551.04 the flanges, the bolts being of sufficient length to allow the nuts to be screwed up tightly. (d) Alignment. The center line or axis of column above and below a joint shall be the same, but where one column is supported by another of larger diameter, the core of the latter shall be tapered down over a dis- tance of at least 6 inches, or a joint plate shall be inserted of sufficient strength to dis- tribute the load. Wherever the core of a cast iron column has shifted more than 1/4 the thickness of the shell, the thickness of the metal all around shall be assumed equal to the thinnest part. (e) Limitations on 'Eccentric Loads. Cast iron columns shall not be used in any case where the load causes tension in the cast iron, or for the frame of structures required to resist stress due to wind. (f) Painting. All cast iron construction shall have at least one coat of approved rust- irihibitive paint. CHAPTER 49. DOORS. 1549.01 Exterior doors. Exterior doors shall be not less than 6'-8" high. Exterior doors of wood shall be not less than 13/4" thick. The minimum width of at least one entrance door shall be 3'-0", and other entrance doors shall be not less than 2'-8". 1549.02 Interior doors. Interior doors shall be not less than 6'-6" high. Doors shall be provided for each door- way to a bedroom, bathroom and lavatory. The minimum width of interior doors shall be 2'-6" for habitable rooms and 2'-0" for bathrooms. CHAPTER 51. STAIRWAYS. 1.551.01 General. It is essential that stairs provide safety of ascent and descent and are designed, ar- ranged and installed so as to afford adequate headroom and space for the passing furni- ture. 1551.02 Critical dimensions. The following tabulation contains the gov- erning dimensions for stairways: Minimum Minimum Minimum Minimum Maximum LOCATION OR TYPE Width Headroom Run Tread Rise Main Stairs 3'-0" 6'-8" 9" 10/4". 8" Basement or Service 2'-6" 6'-4" 8" 9" 8~/4' All riser heights shall be the same in 1551.03 Winders. Winders shall be so designed that the mini- mum tread width shall be 4'.' and.the tread width 18" from the converging end shall be not less than the tread width on the straight run. run of stairs. 1551.04 Landings. The least dimension of intermediate land- ings shall be not less than the width of the stairs, A landing is required at the tap of any stair run having a door which swings to-. wards the stair.