Section R603 Steel Wall Framing
- The maximum tolerance shall be 3/4 inch (19 mm) between the centerline of the horizontal framing member and the centerline of the vertical framing member.
- Where the centerline of the horizontal framing member and bearing stiffener are located to one side of the centerline of the vertical framing member, the maximum tolerance shall be 1/8 inch (3 mm) between the web of the horizontal framing member and the edge of the vertical framing member.
|WEB DEPTH |
|MINIMUM FLANGE WIDTH (inches)||MAXIMUM FLANGE WIDTH (inches)||MINIMUM LIP SIZE |
- The member designation is defined by the first number representing the member depth in hundredths of an inch "S" representing a stud or joist member, the second number representing the flange width in hundredths of an inch, and the letter "t" shall be a number representing the minimum base metal thickness in mils [See Table R603.2(2)].
|DESIGNATION THICKNESS |
|MINIMUM BASE STEEL THICKNESS |
- Manufacturer's identification.
- Minimum base steel thickness in inches (mm).
- Minimum coating designation.
- Minimum yield strength, in kips per square inch (ksi) (MPa).
- A minimum of G 60 in accordance with ASTM A 653.
- A minimum of AZ 50 in accordance with ASTM A 792.
Where No. 8 screws are specified in a steel-to-steel connection, the required number of screws in the connection is permitted to be reduced in accordance with the reduction factors in Table R603.2.4, when larger screws are used or when one of the sheets of steel being connected is thicker than 33 mils (0.84 mm). When applying the reduction factor, the resulting number of screws shall be rounded up.
|SCREW SIZE||THINNEST CONNECTED STEEL SHEET (mils)|
- Holes shall conform to Figure R603.2.5.1;
- Holes shall be permitted only along the centerline of the web of the framing member;
- Holes shall have a center-to-center spacing of not less than 24 inches (610 mm);
- Holes shall have a web hole width not greater than 0.5 times the member depth, or 11/2 inches (38 mm);
- Holes shall have a web hole length not exceeding 41/2 inches (114 mm); and
- Holes shall have a minimum distance between the edge of the bearing surface and the edge of the web hole of not less than 10 inches (254 mm).
Framing members with web holes not conforming to the above requirements shall be reinforced in accordance with Section R603.2.5.2, patched in accordance with Section R603.2.5.3 or designed in accordance with accepted engineering practice.
- Framing members shall be replaced or designed in accordance with accepted engineering practice when web holes exceed the following size limits:
- The depth of the hole, measured across the web, exceeds 70 percent of the flat width of the web; or
- The length of the hole measured along the web exceeds 10 inches (254 mm) or the depth of the web, whichever is greater.
- Web holes not exceeding the dimensional requirements in Section R603.2.5.3, Item 1 shall be patched with a solid steel plate, stud section or track section in accordance with Figure R603.2.5.3. The steel patch shall, as a minimum, be the same thickness as the receiving member and shall extend at least 1 inch (25.4 mm) beyond all edges of the hole. The steel patch shall be fastened to the web of the receiving member with No. 8 screws spaced no more than 1 inch (25.4 mm) center-to-center along the edges of the patch with a minimum edge distance of 1/2 inch (12.7 mm).
|WIND SPEED (MPH) AND EXPOSURE|
|85 B||90 B||100 B
|100 C||< 110 C|
|Wall bottom track to floor per Figure R603.3.1(1)||1-No. 8 screw at 12" o.c.||1-No. 8 screw at 12" o.c.||1-No. 8 screw at 12" o.c.||1-No. 8 screw at 12" o.c.||2-No. 8 screws at 12" o.c.||2 No. 8 screws at 12" o.c.|
|Wall bottom track to foundation per Figure R603.3.1(2)d||1/2" minimum diameter anchor
bolt at 6' o.c.
|1/2" minimum diameter anchor bolt at 6' o.c.||1/2" minimum diameter anchor bolt at 4' o.c.||1/2" minimum diameter anchor bolt at 4' o.c.||1/2" minimum diameter anchor bolt at 4' o.c.||1/2" minimum diameter anchor bolt at 4' o.c.|
|Wall bottom track to wood sill per Figure R603.3.1(3)||Steel plate spaced at 4' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails||Steel plate spaced at 4' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails||Steel plate spaced at 3' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails||Steel plate spaced at 3' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails||Steel plate spaced at 2' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails||Steel plate spaced at 2' o.c., with 4-No. 8 screws and 4-10d or 6-8d common nails|
|Wind uplift connector strength to 16" stud spacingc||NR||NR||NR||NR||NR||65 lb per foot of wall length|
|Wind uplift connector strength for 24" stud spacingc||NR||NR||NR||NR||NR||100 lb per foot of wall length|
- Anchor bolts are to be located not more than 12 inches from corners or the termination of bottom tracks (e.g., at door openings or corners). Bolts are to extend a minimum of 15 inches into masonry or 7 inches into concrete.
- All screw sizes shown are minimum.
- NR = uplift connector not required.
- Foundation anchor straps are permitted in place of anchor bolts, if spaced as required to provide equivalent anchorage to the required anchor bolts and installed in accordance with manufacturer's requirements.