HomeMy WebLinkAbout09042003 BSC Agenda Item 9 Table 2308.1A
Maximum Stud Spacilli . .
Lateral Supporting roof and Supporting 1 floor, Supporting 2 floors,
Stud Unsupported ceiling only roof and ceiling roof and ceiling
Size Stud Height(ft) (in) (in) (in)
2x4 10 24 16
3x4 10 24 24 16
2x5 10 24 24
2x6 10 24 24 16
1 in = 25.4 mm
1 ft = 0.305m •
2308.1.2 Utility grade studs shall not be spaced more than 16 inches
(406 mm) on center, support more than a roof and ceiling and exceed 8 ft
(2438 mm) in height for exterior load bearing walls.
2308.1.3 Heights listed in 2308.1.1 are distances between points of
horizontal lateral support placed perpendicular to the plane of the wall.
Heights may be increased where justified by analysis.
2308.1.4 Where floor trusses, floor joists or roof trusses are spaced
more than 16 inches (406 mm) on center and the bearing studs are
spaced 24 inches (610 mm) on center, such joists or trusses shall bear
within 5 inches (127 mm) of the studs beneath.
EXCEPTIONS:
1. The top plates are two 2x6 or two 3x4 members.
2. A third top plate is installed.
3. Solid blocking equal in size to the studs is installed to reinforce the
double top plate.
Table 2308.1B
Allowable Spans for Wood Structural
Panel Wall Sheathing1,2
Maximum Stud Spacing(in)with
Panel thickness Exterior covering nailed to:
(in)and
Panel Span Rating Construction Stud Sheathing
12/0, 16/0, 20/0 5/16 16 163
or Wall-16oc
24/0, 24/16, 32/16 3/8, 7/16, 15/32, 24 244
or Wall-24oc 1/2
1 in = 25.4 mm (continued)
Notes.(contd*:
1. Spans shall be limited to values shown because of possible effect of concentrated
loads. Allowable uniform load based on deflection of 1/350 of span shall be 100
psf, except panels with a Span Rating of 48 o.c. shall be limited to 65 psf total load
at maximum span. Wood structural panel edges shall have approved tongue-and-
groove joints or shall be supported with blocking, unless 1/4 inch minimum
thickness underlayment is installed, 1 1/2-inch approved cellular or lightweight
concrete is installed, or finish floor is 3/4-inch wood strip. If wood strips are =
perpendicular to supports, thicknesses shown for 16-inch and 20-inch spans shall
have a maximum span of 24-inches.
2. Applicable to all grades of sanded exterior-type plywood.
3. Applicable to underlayment grade and C-C (plugged) plywood, and Single Floor
grade panels. -
2307.7 Plank-And-Beam Framing
2307.7.1 Beams supporting plank floors shall not exceed the limitations set
forth in 2307.2.
2307.7,2 The allowable span for 2-inch planks shall be determined in
accordance with 2301.2 or 2301.3.1.
2307.8 Floor Framing To Masonry Walls
Wood floor construction which rests on masonry walls shall be anchored
thereto in accordance with 2110.3.
2307.9 Stair Framing
2307.9.1 Stair framing shall be supported adequately on floor framing or on
walls or partitions.
2307.9.2 Except in public stairs where the number and size of stringers
shall be determined by engineering analysis, two rough stringers shall be
provided for each set of stairs, cut to receive finish treads and risers of
uniform width and height.
2307.9.3 Unless stringers are supported on walls or partitions, the
minimum effective depth at each notch shall be not less than 3 1/2 inches
(88.9 mm).
2308 VERTICAL FRAMING
2308.1 Exterior Wall Framing
2308.1.1 Studs in one and two story buildings shall be not less than 2x4
with the wide face perpendicular to wall. In three story buildings, studs in
the first story shall be not less than 3x4 or 2x6. Studs shall be spaced in
accordance with Table 2308.1A.