Page 172 - 2018_IRC

FLOORS

HORIZONTAL
FRAMING HORIZONTAL
MEMBER FRAMING
MEMBER
BEARING STIFFENER
BEARING STIFFENER
TRACK
TRACK
STUD
STUD

C STUD
L
C BEARING
L
STIFFENER
HORIZONTAL HORIZONTAL HORIZONTAL
C FRAMING C FRAMING C FRAMING
L
L
L
MEMBER MEMBER MEMBER
¾ (19 mm)″ ¾″ (19 mm) ¾″ (19 mm)
MAX. MAX. MAX.
1
″
8 /(3mm) MAX.
FROM WEB OF
HORIZONTAL
FRAMING
MEMBER TO
EDGE OF
VERTICAL
VERTICAL VERTICAL VERTICAL
C C FRAMING C
L FRAMING L FRAMING MEMBER L FRAMING
MEMBER MEMBER MEMBER
For SI: 1 inch = 25.4 mm.
FIGURE R505.1.2
IN-LINE FRAMING

R505.2.3 Dimension, thickness and material grade. R505.2.5 Fastening. Screws for steel-to-steel connections
Load-bearing cold-formed steel floor framing members shall be installed with a minimum edge distance and center-
1
shall comply with Figure R505.2.3(1) and with the dimen- to-center spacing of / inch (12.7 mm), shall be self-drilling
2
sional and thickness requirements specified in Table tapping, and shall conform to ASTM C1513. Floor sheath-
R505.2.3. Additionally, all C-shaped sections shall have a ing shall be attached to cold-formed steel joists with mini-
minimum flange width of 1.625 inches (41 mm) and a mum No. 8 self-drilling tapping screws that conform to
maximum flange width of 2 inches (51 mm). The mini- ASTM C1513. Screws attaching floor sheathing to cold-
1
mum lip size for C-shaped sections shall be / inch (12.7 formed steel joists shall have a minimum head diameter of
2
mm). Track sections shall comply with Figure R505.2.3(2) 0.292 inch (7.4 mm) with countersunk heads and shall be
3
1
and shall have a minimum flange width of 1 / inch (32 installed with a minimum edge distance of / inch (9.5
8
4
mm). Minimum Grade 33 ksi steel shall be used wherever mm). Gypsum board ceilings shall be attached to cold-
33 mil and 43 mil thicknesses are specified. Minimum formed steel joists with minimum No. 6 screws conforming
Grade 50 ksi steel shall be used wherever 54 and 68 mil to ASTM C954 or ASTM C1513 with a bugle-head style
thicknesses are specified. and shall be installed in accordance with Section R702. For
R505.2.4 Identification. Load-bearing cold-formed steel all connections, screws shall extend through the steel not
framing members shall have a legible label, stencil, stamp fewer than three exposed threads. Fasteners shall have a
or embossment with the following information as a mini- rust-inhibitive coating suitable for the installation in which
mum: they are being used, or be manufactured from material not
susceptible to corrosion.
1. Manufacturer’s identification. R505.2.6 Web holes, web hole reinforcing and web hole
2. Minimum base steel thickness in inches (mm). patching. Web holes, web hole reinforcing, and web hole
3. Minimum coating designation. patching shall be in accordance with this section.
4. Minimum yield strength, in kips per square inch
(ksi) (MPa).

2018 INTERNATIONAL RESIDENTIAL CODE ® 147
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