Page 250 - 2018_IRC

WALL CONSTRUCTION

tened in accordance with Section R603.9.1 and shall be permitted provided that the next higher snow load
Table R603.3.2(1) on the outside surface. column is used to select the stud size from Tables
Interior load-bearing walls shall be permitted to be R603.3.2(2) through R603.3.2(11).
reduced to the next thinner size, as shown in Tables For three-story buildings, the tabulated stud thickness for
R603.3.2(2) through R603.3.2(16), but not less than 33 walls supporting one or two floors, roof and ceiling shall be
1
mils (0.84 mm), where not less than / -inch (12.7 mm) used where the third-floor live load is 30 pounds per square
2
gypsum board is installed and fastened in accordance with foot (1440 Pa). Third-floor live loads of 40 pounds per
Section R702 on both sides of the wall. The tabulated stud square foot (1920 Pa) shall be permitted provided that the
thickness for load-bearing walls shall be used where the next higher snow load column is used to select the stud size
attic load is 10 pounds per square foot (480 Pa) or less. A from Tables R603.3.2(12) through R603.3.2(16).
limited attic storage load of 20 pounds per square foot R603.3.2.1 Gable endwalls. The size and thickness of
(960 Pa) shall be permitted provided that the next higher gable endwall studs with heights less than or equal to 10
snow load column is used to select the stud size from feet (3048 mm) shall be permitted in accordance with
Tables R603.3.2(2) through R603.3.2(16). the limits set forth in Table R603.3.2.1(1). The size and
For two-story buildings, the tabulated stud thickness for thickness of gable endwall studs with heights greater
walls supporting one floor, roof and ceiling shall be used than 10 feet (3048 mm) shall be determined in accor-
where the second-floor live load is 30 pounds per square dance with the limits set forth in Table R603.3.2.1(2).
foot (1440 Pa). Second-floor live loads of 40 psf (1920 Pa)

TABLE R603.3.1
WALL TO FOUNDATION OR FLOOR CONNECTION REQUIREMENTS a, b
ULTIMATE WIND SPEED AND EXPOSURE CATEGORY
FRAMING (mph)
CONDITION
115 B 120 B 130 B or 115 C < 140 B or 120 C 130 C < 140 C
Wall bottom track to floor per 1-No. 8 screw at 1-No. 8 screw at 2-No. 8 screws 2-No. 8 screws 3-No. 8 screws 3-No. 8 screws
Figure R603.3.1(1) 12″ o.c. 8″ o.c. at 8″ o.c. at 6″ o.c. at 8″ o.c. at 6″ o.c.
1 / ″ minimum 1 / ″ minimum 1 / ″ minimum 1 / ″ minimum 1 / ″ minimum 1 / ″ minimum
Wall bottom track to foundation diameter anchor diameter anchor diameter anchor diameter anchor diameter anchor diameter anchor
2
2
2
2
2
2
d
per Figure R603.3.1(2)
bolt at 6′ o.c. bolt at 6′ o.c. bolt at 4′ o.c. bolt at 4′ o.c. bolt at 3′-4″ o.c. bolt at 2′-8″ o.c.
Steel plate Steel plate Steel plate Steel plate Steel plate Steel plate
spaced at 4′ o.c., spaced at 4′ o.c., spaced at 3′ o.c., spaced at 3′ o.c., spaced at 2′ o.c., spaced at 1′-4″
Wall bottom track to wood sill with 4-No. 8 with 4-No. 8 with 4-No. 8 with 4-No. 8 with 4-No. 8 o.c., with 4-No.
per Figure R603.3.1(3) screws and 4- screws and 4- screws and 4- screws and 4- screws and 4- 8 screws and 4-
10d or 6-8d 10d or 6-8d 10d or 6-8d 10d or 6-8d 10d or 6-8d 10d or 6-8d
common nails common nails common nails common nails common nails common nails
Stud Roof
Spacing Span
(inches) (feet)
24 NR NR NR NR NR NR
28 NR NR NR NR NR 339
16 32 NR NR NR NR NR 382
Wind uplift
connector 36 NR NR NR NR 333 426
strength 40 NR NR NR NR 368 470
(lbs) c, e
24 NR NR NR NR 343 443
28 NR NR NR NR 395 508
24 32 NR NR NR 330 447 573
36 NR NR NR 371 500 639
40 NR NR 345 411 552 704
For SI: 1 inch = 25.4 mm, 1 mile per hour = 0.447 m/s, 1 foot = 304.8 mm, 1 pound = 4.45 N.
a. Anchor bolts are to be located not more than 12 inches from corners or the termination of bottom tracks, such as at door openings or corners. Bolts are to
extend not less than 15 inches into masonry or 7 inches into concrete.
b. All screw sizes shown are minimum.
c. NR = Uplift connector not required.
d. 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.
e. See Figure R603.3.1(4) for details.

2018 INTERNATIONAL RESIDENTIAL CODE ® 225
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