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§ 1579.01
<br />DWELLING HOUSE CODE
<br />has .been underlaid with membrane water-
<br />proofing.
<br />(b) Applied over wood subfioor. When
<br />applied over wood subflooring, lining felt
<br />weighing approximately 1 pound per square
<br />78
<br />yard shall be ,installed before applying the
<br />rubber tile, asphalt the or linoleum. The ad-
<br />hesive and method of installing the or lino-
<br />leum shall meet with the approval of the
<br />Building Official.
<br />CHAPTER 79. INTERIOR FINISH AND ASSEMBLIES.
<br />1579.01 dVhen required.
<br />In all habitable rooms or in any space
<br />within a building used or occupied so as to
<br />be deemed to be part of the dwelling occu-
<br />panty, all wall and ceiling finish shall con-
<br />form to the provisions of .this chapter and,
<br />when deemed necessary for safety to life or
<br />property, the Building Official may require
<br />the installation of approved wall or ceiling
<br />finish over combustible members which
<br />would otherwise be exposed within such
<br />rooms or spaces.
<br />1579.02 When not required.
<br />The provisions of the chapter shall not be
<br />interpreted to require the installation of in-
<br />terior wall or ceiling finish over combustible
<br />structural members in rooms or spaces, such
<br />as attics or cellars, which do not form part
<br />of the portion of the building used for human
<br />occupancy, or which are used only for me-
<br />chanical equipment or controls that do not
<br />create a fire hazard, where such finish is
<br />not necessary to secure a required protec-
<br />tion or fire-resistance rating.
<br />1579.03' Interior doors, sash and frames.
<br />Where fire doors or windows are not re-
<br />quired by this Dwelling House Code, interior
<br />doors, sash, and frames may be of untreated
<br />wood.
<br />1579.04 Lathing and furring-general.
<br />All lathing and furring shall be of a quality
<br />and shall be installed in conformity with the
<br />provisions of ASA Standard Specifications
<br />for Gypsum Plastering and Interior Lathing
<br />and Furring, A42.1, A42.4.
<br />1579.05 Wood lath.
<br />Wood lath shall be No, 1 lath, 5/16 inch
<br />thick, nailed at each bearing to studs or joists
<br />spaced not more than 16 inches o,c. Lath
<br />shall be spaced not less than 1/4 inch' nor
<br />more than 3/s inch. apart and shall .break
<br />joints every seventh lath,
<br />1579.06 Expanded metal lath.
<br />Expanded metal lath shall conform to FS
<br />QQ-B-lOlc and, if corrodible, shall be
<br />painted or galvanized, with minimum weight
<br />and maximum spacing of studs or joists as
<br />tabulated below:
<br />Pounds Per Studs or Joist
<br />Use Square Yard. Spacing
<br />Walls 2.5 diamond mesh 16"
<br /> 2.75 (flat-rib) 16"
<br /> 3,4 (flat-rib) 20"
<br /> 3.0 (s/s"rib) 24"
<br />Ceilings 2.75 (flat-rib) 16"
<br /> 3.4 diamond mesh 16"
<br /> 3.4 (flat-rib) 19"
<br /> 3.4 (3/s" rib) 24"
<br />1579.07 Wovemwire fabric, galvanized.
<br />The m inimum gage, maximum mesh and
<br />spacing of supports for galvanized woven
<br />wire fabric shall be as tabulated below:
<br /> Wire Mesh Stud or
<br />Use Gages Per Inch Joist Spacing
<br />Walls 19 ~ 21/z 16"
<br />Ceilings 18 21/2 16"
<br /> 18~, 21/z 20"
<br />~ With stiffeners
<br />1579.08 Welded wire fabric, galvanized. „
<br />An absorbent quality or perforated paper
<br />shall be used as backing for galvanized
<br />welded wire fabric. The minimum size of
<br />wire shall be 16 gage, with maximum mesh
<br />of 2" x 2"; the maximum spacing of supports
<br />shall be 16 inches o,c. When used on ceilings,
<br />paper backing shall be combined integrally
<br />with wire fabric.
<br />1579.09 Insulating fiberboard lath.
<br />(a) Grade, thickness and nailing. Insulat-
<br />ing board, made from wood or other vegeta-
<br />ble fibers, shall meet the requirements. of
<br />FS LLL-F-321b, Fiberboard; Insulating; and
<br />CS42, Structural Fiber Insulating Board.
<br />The minimum thickness of insulating fiber-
<br />boardlath shall be 1/z inch, with a width of 18
<br />inches and length of 48. inches. The maxi-
<br />mum stud or joist spacing shall be 16 inches
<br />o.c. For exterior solid masonry walls, 1 x 2
<br />inch furring strips shall be installed ver-
<br />tically on not more than 16 inches o.c. and
<br />shimmed to a true level plane, Blue plaster-
<br />boardnails with 5/16 inch heads, with length
<br />1.541.23 Built-in wood.
<br />Nailing blocks, not exceeding an ordinary
<br />brick in size, may be placed in masonry
<br />walls; and except for timber centering for
<br />arches mentioned in Section 1541.19, no
<br />other wood or timber shall be placed in ma-
<br />sonry walls, but this shall not preclude the
<br />use, on exterior walls for decorative pur-
<br />poses only, of timber members against the
<br />masonry or set into -the masonry to no
<br />greater extent than permitted for chases.
<br />CHAPTER 43. PLAIN AND REINFORCED CONCRETE.
<br />1543.01 Quality of plain concrete.
<br />. Cast-in-place concrete construction, rein-
<br />forced only for shrinkage or temperature
<br />changes, shall be classed as plain concrete.
<br />Plain concrete, other than concrete fill, shall
<br />have a minimum compressive strength at 28
<br />days of 2,000 psi, when tested according to
<br />ASTM C 39; except that concrete with light-
<br />' weight aggregates may be approved with
<br />lesser strength when the Building Official is
<br />satisfied that the lightweight concrete has
<br />sufficient strength and durability far the pro-
<br />posed use. The Building Official may accept
<br />a mix of 1 part portland cement .to not more
<br />than 23/4 parts fine aggregate and 41/4 parts of
<br />coarse aggregate by volume as equivalent to
<br />2,000 psi concrete, provided that the amount
<br />of water used, including that contained in
<br />the aggregate, is not greater than 71/z gallons
<br />per sack of cement.
<br />1543.02 Ingredient requirements for con-
<br />. Grote.
<br />Concrete ingredients shall conform to the
<br />following requirements:
<br />1. Portland cement shall conform to the
<br />requirements of ASTM C 150, ASTM C 175
<br />or ASTM C 205.
<br />2. Concrete aggregates shall conform to
<br />the requirements of ASTM C 33, or of ASTM
<br />C 130. Fine aggregates. for concrete shall be
<br />natural sand or sand prepared from stone,
<br />gravel, or blast furnace slag, clean and well-
<br />graded from fine to coarse. Coarse aggre-
<br />gates for concrete shall be crushed stone,
<br />' gravel, blast furnace slag or other inert ma-
<br />terials of similar characteristics, free from
<br />excessive amounts of deleterious substances;
<br />sharp, and well-graded from fine to coarse.
<br />3. Water used in mixing concrete shall be
<br />clean and free from deleterious amounts of
<br />acids, alkalis or organic materials.
<br />1543.03 Size of aggregate.
<br />The. maximum size of aggregate shall be
<br />not larger than 1/s the .narrowest dimension
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<br />Concrete
<br />§ 1543.07
<br />1541.21 Wetting.
<br />Brick of clay or shale, laid in other than
<br />Type D mortar, shall be wetted, except in
<br />freezing weather, before being laid unless
<br />their gain in weight is less than 3/4 ounce
<br />when immersed flatwise in 1/a inch of water
<br />for one minute.
<br />1541.22 Support.
<br />No masonry wall shall be supported on
<br />combustible construction.
<br />between the forms in which the concrete is
<br />to be placed nor larger than 3/4 the minimum
<br />clear space between reinforced bars.
<br />1543.04 Quality of reinforced concrete.
<br />Reinforced concrete shall have a minimum
<br />compressive strength of 3,000 psi at 28 days;
<br />The Building Official may accept a mix of 1
<br />part portland cement to not more than 2i/z
<br />parts of fine aggregate and 33/4 parts of
<br />coarse aggregate by volume as equivalent to
<br />3,000 psi concrete provided the amount of
<br />water used, including that contained in the
<br />aggregate, is not mare than 61/z gallons ,per
<br />sack of cement. '
<br />1543,05 Reinforcement. _
<br />Steel bars, expanded metal lath or welded
<br />wire fabric used for reinforcement shall be
<br />free from harmful rust and dirt, The mini=
<br />mum protective covering for reinforcement,
<br />shall be 11/z inches for columns,,beams, and
<br />girders and 3/4 inch for solid slabs and walls.
<br />Concrete protection for reinforcement shall
<br />in all cases be at least equal to. the diameter
<br />of round bars and 11/z times the side dimen-
<br />sion of square bars. For concrete surfaces
<br />exposed to the weather or in contact with
<br />the ground, the reinforcement shall be'pro-
<br />tatted with not less than 2 inches of'concrete
<br />for bars more than 5/s inches in diameter and
<br />11/z .inches for bars 5/s inch or less in di-
<br />ameter.
<br />1543.06 Preparation and protection of con=
<br />crate.
<br />Except as may be otherwise provided iri
<br />this Dwelling House Code, the mixing,. con-
<br />veying, placing, curing and protecting of
<br />concrete shall conform to ACI 318.
<br />1543.07 Placing concrete in cold weather.
<br />Unless provision, approved. by the Build-
<br />ing Official, is made against freezing, no
<br />concrete shall be deposited when the air
<br />temperature is 40 F or lower.
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