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Table 45C bWELLING HOUSE CODE 52 •
<br />TABLE 45C SAFE AXIAL LOADS FOR FRAME WALLS
<br /> S4S Studs With Sheathing or Plaster on Both Sides
<br />Nominal Spacing Safe loads in lb, per lin. ft, of frame wall
<br />Size of Net of
<br />Studs Area Studs Height of Wall in Feet
<br />(Inches) (Sq. in.) (Inches) 7 8 9 10 11 12
<br />2x4 5.89 16 3,160 2,480 1,960 1,590 1,315 1,107
<br /> 24 2,110 1,650 1,310 1,060 875 737
<br />3x4 9.52 16 5,100 4,010 3,150 2,570 2,130 1,790
<br /> 24 3,400 2,670 2,100 1,710 1,420 1,193
<br />2x6 9.14 16 6,300 6,090 5,790 .5,400 4,810 4,120
<br /> 24 4,200 4,060 3,860 3,600 3,200 2,745
<br />3x6 14.77 16; . 10,170 9,840 9,370 8,720 7,780 6,660
<br /> 24" 6,780 6,560 6,250 5,810 5,190 4,440
<br />2x8 12.19 16 8,660 8,560 8,440 8,270 8,040 7,720
<br /> 24 5,770 5,710 5,630 5,510 5,350 5,140
<br />~' See Subsection 1545.03(d) .
<br />1545.15 Bearing and anchorage on girders.
<br />Floor beams framing into girders shall be
<br />anchored, tied or nailed to secure continuity.
<br />The ends of all beams or joists resting on
<br />girders shall bear not less than 4 inches, or
<br />shall be supported in approved metal.stir-
<br />rups, or on wood clips or ribbon strips not
<br />less than 2 x 3 inches in size. Beams or joists
<br />framing from opposite sides shall either lap
<br />not-less than 4 inches or be securely bolted
<br />or spiked together. When framing end to
<br />end,, all joists, beams and girders shall be
<br />secured together by metal ties, straps, or
<br />dogs.
<br />1545.10 Joints in girders. •
<br />The joints of solid or built-up beams or
<br />girders• shall be made over column or pier
<br />supports when constructed as simple spans.
<br />Except for glued laminated construction as
<br />provided for in Section 1545.03 (b) ; built-up
<br />continuous beams or girders, constructed of
<br />multiple joists, shall have the joints broken
<br />or'staggered in adjoining joists and all joints
<br />shall, be'located between i/s and 1/4 the span
<br />length from' supports and shall be securely
<br />nailed or otherwise bonded together.
<br />1545.17 Headers and Trimmers. -
<br />Allheaders more than 4 feet in. length and
<br />their. trimmers shall be doubled. Headers
<br />wth.4 or more tail beams or 6 feet or more
<br />in length shall be supported on approved
<br />metal joist hangers. When nailing is used,
<br />the tail and header beams shall be secured
<br />with one 20d nail for each 4 square feet of
<br />floor. All tail beams or joists which are 12
<br />feet -ar- more in length shall be hung iri ap-
<br />proved joist or beam hangers. All trimmer
<br />beams supported on walls or partitions of
<br />the same construction shall be spiked to-
<br />gether.
<br />1545.18 Walls, partitions, and posts.
<br />The ~oad-bearing value of frame walls and
<br />partitions shall be limited by TABLE 45C ex-
<br />cept asotherwise provided• inSection 1545.03.
<br />Wood posts shall be one, piece and square at
<br />both ends. The minimum size of such posts
<br />for basements shall be 6. x 6; above base-
<br />ments, 4 x 4. All wood posts used in base-
<br />ments or cellars shall be pressure impreg-
<br />nated with a preservative approved by_the
<br />Building Official or have; a masonry base
<br />which extends not less than 3 inches above
<br />the finished floor;: When a .flooring of solid
<br />impervious materials is not provided, :the
<br />wood posts or columns shall be pressure im-,
<br />pregnated with a preservative approved by
<br />the Building Official or shall rest on a ma-
<br />sonry base extending not, less than 6 inches
<br />above the finished floor. Exterior wood posts
<br />in permanent- construction, which do- not
<br />have a preservative treatment approved by
<br />the Building Official or are not the heart
<br />wood of.a durable species, shall be supported
<br />at least 6 inches above ground°level on ma-
<br />sonry or other base approved by the Build-
<br />ing Official.
<br />1545.19 Foundation anchorage.
<br />Wall sills shall be anchored to foundation
<br />walls at corners and at intermediate inter-
<br />vals of not more than 8 feet with i/z inch
<br />bolts embedded in the masonry foundation
<br />to a depth of not less'than 8 inches:
<br />s •
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<br />73
<br />Floors, Ceilings and Roofs
<br />§ 1575.02
<br />Maximum
<br />Minimum Size Spacing
<br />2 x 4's (2-inch thickness) 16 inches o.c.
<br />2 x 3's (3-inch thickness) 24 inches o.c.
<br />2 x 4's (4-inch thickness) 24 inches o.c,
<br />1573.03 Framing openings in wood non-
<br />bearing partitions.
<br />In 2-inch thick partitions, a 2 x 2 inner stud
<br />shall be placed at the jamb, extending in one
<br />piece from header to sole plate or base, nailed
<br />to outer stud; or single frame with 2 x 6
<br />jambs continuous from top plate to sole
<br />plate with header notched 2 inches into each
<br />jamb. In 3-inch and 4-inch thick partitions,
<br />openings may be framed with single studs
<br />provided opening does not exceed 3 feet in
<br />width and header is secured by spiking
<br />through jamb studs. The size and framing of
<br />headers in non-bearing partitions shall be
<br />not less than tabulated as follows:
<br />Opening width, 3 feet or less:
<br />2-inch thick partition, one 2 x 4 on edge;
<br />3-inch thick partition, one 2 x 3 flat;
<br />4-inch thick partition, one 2 x 4 flat.
<br />Opening width, over 3 feet:
<br />2-inch thick partition, one 2 x 4 on edge;
<br />3-inch thick partition, two 2 x 3's flat;
<br />4-inch thick partition, two 2 x 4's flat.
<br />1573.04 Top and sole plates in wood non-
<br />bearing partitions.
<br />Top and sole plate shall be 2 inches mini-
<br />mum thickness; top plates shall be lapped
<br />at outside wall and at bearing partitions.
<br />When partitions are parallel to ceiling joists,
<br />a 1 x 6 nailing member for securing ceiling
<br />finish shall be provided on top of top plate.
<br />This nailing member shall be secured to
<br />cross-blocking placed not more than 16
<br />inches o.c, between joists:
<br />1573.05 Cabinet or sectional partitions.
<br />Built-in and/or sectional-fitted wardrobes,
<br />cabinets or casework shall be acceptable as
<br />non-bearing partitions.
<br />1573.06 Solid plaster and other types of
<br />partitions.
<br />Solid plaster and other types of non-bear-
<br />ingpartitions maybe installed, subject to the
<br />approval of the Building Official.
<br />1573.07 Masonry bearing partitions.
<br />Bearing partitions of masonry shall be of
<br />sufficient thickness to support their vertical
<br />loads. The maximum ratio of unbraced
<br />height or length to thickness shall not ex-
<br />ceed that specified in Section 1569.01. The
<br />minimum thickness of poured concrete bear-
<br />ing partitions shall be 6 inches. Masonry
<br />units, when supporting not more than one
<br />floor, shall be not less than 6 inches thick,
<br />otherwise, not less than 8 inches thick. Sec-
<br />tions of walls, 2 feet or less in length such
<br />as occur at openings, shall be constructed
<br />of solid masonry units or hollow units filled
<br />with concrete.
<br />1573.08 Beam supports in masonry bearing
<br />partitions.
<br />Lintels over openings shall have a mini-
<br />mum bearing of 4 inches provided by solid
<br />masonry at least 4 inches thick. Joists shall
<br />bear on solid masonry at least 4 inches thick,
<br />Girders shall bear on solid masonry or con-
<br />crete at least 6 inches thick.
<br />1573.09 Non-bearing masonry partitions.
<br />Non-bearing partitions of masonry shall be
<br />built solidly against the floor and ceiling con-
<br />structions within which they are contained
<br />or shall be otherwise securely anchored
<br />against displacement, and shall not exceed
<br />the following unsupported heights:
<br />Thickness, Maximum
<br />Exclusive of Plaster Unsupported Height
<br />Inches Feet
<br />2 9 (not over
<br />6 ft. in
<br />length)
<br />3 12
<br />4 .15
<br />6 20
<br />8 25
<br />CHAPTER 75. FLOORS, CEILINGS AND- ROOFS.
<br />1575.01 Column and posts.
<br />Wood posts shall meet the requirements
<br />set forth in Chapter 45. 5tee1 and cast-iron
<br />columns shall meet the requirements set
<br />forth in Chapter 47. Metal adjustable posts
<br />or columns and the manner of installation
<br />shall meet with the approval of the Build-
<br />ing Official.
<br />1575.02 Wood members embedded in or laid
<br />on masonry.
<br />(a) Masonry walls. When wood members,
<br />which are not heartwood of a durable species,
<br />are to be embedded or rest within exterior
<br />masonry walls which are below the adjoin-
<br />inggrade, the parts to be within the masonry
<br />shall be protected against moisture in a man-
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