Page 219 - 2018_IRC

WALL CONSTRUCTION

R602.10.2.2.1 Location of braced wall panels in at the end of a braced wall line shall contribute its pro-
Seismic Design Categories D , D and D . Braced jected length for only one of the braced wall lines at the
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0
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wall panels shall be located at each end of a braced projected corner.
wall line. Exception: The length of wall bracing for dwellings in
Exception: Braced wall panels constructed of Seismic Design Categories D , D and D with stone or
0
2
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Method WSP or BV-WSP and continuous masonry veneer installed in accordance with Section
sheathing methods as specified in Section R703.8 and exceeding the first-story height shall be in
R602.10.4 shall be permitted to begin not more accordance with Section R602.10.6.5.
than 10 feet (3048 mm) from each end of a R602.10.4 Construction methods for braced wall pan-
braced wall line provided that each end complies els. Intermittent and continuously sheathed braced wall
with one of the following: panels shall be constructed in accordance with this section
1. A minimum 24-inch-wide (610 mm) panel and the methods listed in Table R602.10.4.
for Methods WSP, CS-WSP, CS-G and R602.10.4.1 Mixing methods. Mixing of bracing
CS-PF is applied to each side of the build- methods shall be permitted as follows:
ing corner as shown in End Condition 4 of 1. Mixing intermittent bracing and continuous
Figure R602.10.7. sheathing methods from story to story shall be
2. The end of each braced wall panel closest permitted.
to the end of the braced wall line shall have 2. Mixing intermittent bracing methods from
an 1,800 lb (8 kN) hold-down device fas- braced wall line to braced wall line within a story
tened to the stud at the edge of the braced shall be permitted. In regions within Seismic
wall panel closest to the corner and to the Design Categories A, B and C where the ultimate
foundation or framing below as shown in design wind speed is less than or equal to 130
End Condition 5 of Figure R602.10.7. mph (58m/s), mixing of intermittent bracing and
R602.10.2.3 Minimum number of braced wall pan- continuous sheathing methods from braced wall
els. Braced wall lines with a length of 16 feet line to braced wall line within a story shall be
(4877 mm) or less shall have not less than two braced permitted.
wall panels of any length or one braced wall panel 3. Mixing intermittent bracing methods along a
equal to 48 inches (1219 mm) or more. Braced wall braced wall line shall be permitted in Seismic
lines greater than 16 feet (4877 mm) shall have not less
than two braced wall panels. Design Categories A and B, and detached dwell-
ings in Seismic Design Category C, provided that
R602.10.3 Required length of bracing. The required the length of required bracing in accordance with
length of bracing along each braced wall line shall be Table R602.10.3(1) or R602.10.3(3) is the highest
determined as follows: value of all intermittent bracing methods used.
1. All buildings in Seismic Design Categories A and B 4. Mixing of continuous sheathing methods CS-
shall use Table R602.10.3(1) and the applicable WSP, CS-G and CS-PF along a braced wall line
adjustment factors in Table R602.10.3(2). shall be permitted. Intermittent methods ABW,
2. Detached buildings in Seismic Design Category C PFH and PFG shall be permitted to be used along
shall use Table R602.10.3(1) and the applicable a braced wall line with continuous sheathed
adjustment factors in Table R602.10.3(2). methods, provided that the length of required
bracing for that braced wall line is determined in
3. Townhouses in Seismic Design Category C shall use
the greater value determined from Table accord Tabl R602.10.3( or
R602.10.3(1) or R602.10.3(3) and the applicable R602.10.3(3) using the highest value of the brac-
adjustment factors in Table R602.10.3(2) or ing methods used.
R602.10.3(4), respectively. 5. In Seismic Design Categories A and B, and for
detached one- and two-family dwellings in Seis-
4. All buildings in Seismic Design Categories D , D 1
0
and D shall use the greater value determined from mic Design Category C, mixing of intermittent
2
Table R602.10.3(1) or R602.10.3(3) and the appli- bracing methods along the interior portion of a
cable adjustment factors in Table R602.10.3(2) or braced wall line with continuous sheathing meth-
R602.10.3(4), respectively. ods CS-WSP, CS-G and CS-PF along the exterior
portion of the same braced wall line shall be per-
Only braced wall panels parallel to the braced wall line mitted. The length of required bracing shall be
shall contribute toward the required length of bracing of the highest value of all intermittent bracing meth-
that braced wall line. Braced wall panels along an angled ods used in accordance with Table R602.10.3(1)
wall meeting the minimum length requirements of Tables or R602.10.3(3) as adjusted by Tables
R602.10.5 and R602.10.5.2 shall be permitted to contrib- R602.10.3(2) and R602.10.3(4), respectively. The
ute its projected length toward the minimum required requirements of Section R602.10.7 shall apply to
length of bracing for the braced wall line as shown in Fig- each end of the continuously sheathed portion of
ure R602.10.1.4. Any braced wall panel on an angled wall the braced wall line.

194 2018 INTERNATIONAL RESIDENTIAL CODE ®
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