Page 247 - 2018_IRC

WALL CONSTRUCTION

2. Where the centerline of the horizontal framing Track sections shall comply with Figure R603.2.3(2) and
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member and bearing stiffener is located to one side shall have a minimum flange width of 1 / inches (32 mm).
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of the centerline of the vertical framing member, the Minimum Grade 33 ksi steel shall be used wherever 33
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maximum tolerance shall be / inch (3 mm) between mil and 43 mil thicknesses are specified. Minimum Grade
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the web of the horizontal framing member and the 50 ksi steel shall be used wherever 54 and 68 mil thick-
edge of the vertical framing member. nesses are specified.
R603.2 Structural framing. Load-bearing cold-formed steel R603.2.4 Identification. Load-bearing cold-formed steel
wall framing members shall be in accordance with this section. framing members shall have a legible label, stencil, stamp
R603.2.1 Material. Load-bearing cold-formed steel fram- or embossment with the following information as a mini-
ing members shall be cold formed to shape from structural- mum:
quality sheet steel complying with the requirements of 1. Manufacturer’s identification.
ASTM A1003: Structural Grades 33 Type H and 50 Type H. 2. Minimum base steel thickness in inches (mm).
R603.2.2 Corrosion protection. Load-bearing cold- 3. Minimum coating designation.
formed steel framing shall have a metallic coating comply-
ing with ASTM A1003 and one of the following: 4. Minimum yield strength, in kips per square inch
(ksi) (MPa).
1. Not less than G 60 in accordance with ASTM A653.
R603.2.5 Fastening. Screws for steel-to-steel connections
2. Not less than AZ 50 in accordance with ASTM A792. shall be installed with a minimum edge distance and cen-
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R603.2.3 Dimension, thickness and material grade. ter-to-center spacing of / inch (12.7 mm), shall be self-
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Load-bearing cold-formed steel wall framing members drilling tapping and shall conform to ASTM C1513. Struc-
shall comply with Figure R603.2.3(1) and with the dimen- tural sheathing shall be attached to cold-formed steel studs
sional and thickness requirements specified in Table with minimum No. 8 self-drilling tapping screws that con-
R603.2.3. Additionally, C-shaped sections shall have a form to ASTM C1513. Screws for attaching structural
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minimum flange width of 1 / inches (41 mm) and a maxi- sheathing to cold-formed steel wall framing shall have a
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mum flange width of 2 inches (51 mm). The minimum lip minimum head diameter of 0.292 inch (7.4 mm) with
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size for C-shaped sections shall be / inch (12.7 mm). countersunk heads and shall be installed with a minimum
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HORIZONTAL
FRAMING HORIZONTAL
MEMBER FRAMING
MEMBER
BEARING STIFFENER
BEARING STIFFENER
TRACK
TRACK
STUD
STUD
C STUD
L
C L BEARING
STIFFENER
HORIZONTAL HORIZONTAL HORIZONTAL
C L FRAMING C L FRAMING C FRAMING
MEMBER MEMBER L MEMBER

3/4“ 3/4“ 3/4“
MAX. MAX. MAX.

1 8″ / MAX.
FROM WEB OF
HORIZONTAL
FRAMING
MEMBER TO
EDGE OF
VERTICAL VERTICAL VERTICAL VERTICAL
C L FRAMING C L FRAMING FRAMING C L FRAMING
MEMBER MEMBER MEMBER MEMBER

For SI: 1 inch = 25.4 mm,
FIGURE R603.1.2
IN-LINE FRAMING

222 2018 INTERNATIONAL RESIDENTIAL CODE ®
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