TABLE R602.10.1(1) (Supp) WALL BRACING PERCENTAGE OF FULL .

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TABLE R602.10.1(1)a,b,c (Supp)WALL BRACINGPERCENTAGE OF FULL-HEIGHTMAXIMUMBRACING PER WALL LINESPACINGFor Method 3 andFor other methods BETWEEN BRACEDcontinuous sheathingeWALL LINES e SectionR602.10.1.4 for16%25%exceptions)30%45%SEISMIC DESIGNCATEGORY (SDC)OR WIND SPEEDSTORIES ABOVEBRACED WALLLINEdMETHOD OFBRACINGPERMITTEDSDC A and B (Ss 0.35g andSds 0.33g), 100 mphSDC C(Ss 0.6g andSds 0.53g), 110 mphSDC D0 & D1 (Ss 1.25g andSds 0.83g), 110 mph01Methods 1-8Methods 1-82Methods 2-801Methods 1-8Methods 2-82Methods 2-845%60%01Methods 2-8Methods 2-820%45%30%60%2Methods 2-860%85%01Cripple wallMethods 2-8Methods 2-8Method 325%55%75%40%75%Not PermittedSDC D2, 110 mph25(See SectionR602.10.1.4.1 forexceptions)a. Wall bracing percentages are based on a soil site class “D.” Interpol ation of bracing percentage between the Sdsvalues associated with the Seismic Design Categories shall be permitted when a site-specific Sds value isdetermined in accordance with Section 1613.5 of the International Building Code.b. Foundation cripple wall panels shall be braced in accordance with Section R602.10.8.c. Methods of bracing shall be as described in Sections R602.10.2 and R602.10.4.1. The alternate braced wallpanels described in Section R602.10.3.2 shall also be permittedd. Stories above braced wall line. 0 one story or top of two or three story. 1 first story of two story or second storyof three story. 2 first story of three story.e. Method 1 bracing exempt from percentage bracing requirement.TABLE R602.10.1(2) (Supp)ADJUSTMENT FACTORS TO THE PERCENTAGE OF REQUIRED WALL BRACING a 10 ft 10 12 ft 35 ft 35 50 ftMULTIPLY PERCENTAGE OFBRACING PER WALL LINE BY:1.01.21.01.43 8 151.0 8 psf0.85 15 psf1.0 15 psf 25 psf1.1ADJUSTMENT BASED ON:bStory height (Section 301.3)Braced wall line spacing in SDC A-CWall dead loadb,deRoof/ceiling dead loadb,cfor wall supporting :roof only or roof plus onestoryroof onlyroof plus one storyWalls with stone or masonry veneer in SDC C-D2Cripple wallsa.b.c.d.e.APPLIES TO:All bracing methods R602.10.2 andR602.10.4.1 15 psf 25 psf1.2See Section R703.7, Exception 1-4See Section R602.10.8The total percentage of bracing required for a given wall line is the product of all applicable adjustment factors.Linear interpolation shall be permitted.Bracing required for a site’s wind speed shall not be adjusted for dead load.Braced wall line spacing in excess of 35-ft shall be in accordance with R602.10.1.4.The adjusted percentage of bracing shall not be less than that required for the site’s wind speed.IRC-RB210ICC PUBLIC HEARING ::: February 2008

R602.10.3 (Supp) Minimum length of braced panels. For Methods 2, 3, 4, 6, 7 and 8 above, each braced wall panelshall be at least 48 inches (1219 mm) in length, covering a minimum of three stud spaces where studs are spaced 16inches (406 mm) on center and covering a minimum of two stud spaces where studs are spaced 24 inches (610 mm)on center. For Method 5 above, each braced wall panel and shall be at least 96 inches (2438 mm) in length whereapplied to one face of a braced wall panel and at least 48 inches (1219 mm) where applied to both faces. For Methods2, 3, 4, 6, 7 and 8, for purposes of computing the percentage of panel bracing required in Table R602.10.1(1), theeffective length of the braced wall panel shall be equal to the actual length of the panel. When Method 5 panels areapplied to only one face of a braced wall panel, bracing percentages required in Table R602.10.1(1) for Method 5 shallbe doubled.Exceptions:1. Lengths of braced wall panels for continuous wood structural panel sheathing methods shall be inaccordance with Section Table R602.10.4.2.2. Lengths of alternate braced wall panels shall be in accordance with Section R602.10.3.2.1 or SectionR602.10.3.2.2.3. For Methods 2, 3, 4, 6, 7 and 8 in Seismic Design Categories A, B, and C: Panels between 36 inches and 48inches in length shall be permitted to count towards the required percentage of bracing in TableR602.10.1(1), and the effective contribution shall comply with Table R602.10.3.TABLE R602.10.3 (Supp)EFFECTIVE LENGTHS FOR BRACE WALL PANELS LESS THAN 48 INCHES IN ACTUAL LENGTH(BRACE METHODS 2, 3, 4, 6, 7, AND 8aEffective Length of Braced Wall Panel (inches)Actual Length of Braced Wall Panel (inches)4842368-foot Wall Height4836279-foot Wall Height4836N/A10-foot Wall Height48N/AN/AFor SI: 1 inch 25.4mmInterpolation shall be permitted.2. Delete and substitute as follows:R602.10.4 (Supp) Continuously-sheathed braced wall line using Method 3 (wood structural panel).Continuously sheathed braced wall lines using wood structural panels shall comply with this section. Different bracingmethods shall not be permitted within a continuously sheathed braced wall line. Other bracing methods prescribed bythis code shall be permitted on other braced wall lines on the same story level or on different story levels of thebuilding.Exception: All exterior braced wall lines shall be continuously sheathed where required by Section R602.10.4.7.R602.10.4.1 (Supp) Continuously-sheathed braced wall line requirements. Continuously-sheathed braced wallline shall be in accordance with Figure R602.10.4(1) and shall comply with all of the following requirements:1. Structural sheathing shall be applied to all exterior sheathable surfaces of a braced wall line including areasabove and below openings.2. Only full-height braced wall panels shall be used for calculating the braced wall percentage in accordance withTable R602.10.1(1).FIGURE R602.10.4(1) (Supp)CONTINUOUSLY-SHEATHED BRACED WALL LINER602.10.4.2 Braced wall panel length. In a continuously-sheathed wood structural panel braced wall line, theminimum braced wall panel length shall be permitted to be in accordance with Table R602.10.4.2.TABLE R602.10.4.2 (Supp)LENGTH REQUIREMENTS FOR BRACED WALL PANELSIN A CONTINUOUSLY SHEATHED WALL aMINIMUM LENGTH OF BRACED WALL PANELFor SI: 1 inch 25.4 mm, 1 foot 305 mma. Interpolation shall be permitted.ICC PUBLIC HEARING ::: February 2008IRC-RB211

R602.10.4.3 (Supp) Braced wall panel location and corner construction. A braced wall panel shall be located ateach end of a continuously-sheathed braced wall line. A minimum 24-inch (610 mm) wood structural panel cornerreturn shall be provided at both ends of a continuously-sheathed braced wall line in accordance with FigureR602.10.4.3(1). In lieu of the corner return, a tie-down device with a minimum uplift design value of 800 lb shall befastened to the corner stud and to the foundation or framing below in accordance with Figure R602.10.4.3(2).Exception: The first braced wall panel shall be permitted to begin 12 feet 6 inches (3810 mm) from each end ofthe braced wall line in Seismic Design Categories A, B, and C and 8 feet in Seismic Design Categories D0, D1, andD2 provided one of the following is satisfied:1. A minimum 2-foot-long (610 mm), full-height wood structural panel is provided at both sides of a cornerconstructed in accordance with Figure R602.10.4.3(1) at the braced wall line ends in accordance with FigureR602.10.4.3(3), or2. The braced wall panel closest to the corner shall have a tie-down device with a minimum uplift design valueof 800 lb (36 kg) fastened to the stud at the edge of the braced wall panel closest to the corner and to thefoundation or framing below in accordance with Figure R602.10.4.3(4).FIGURE R602.10.4.3(1) (Supp)TYPICAL EXTERIOR CORNER FRAMING FOR CONTINUOUS STRUCTURALPANEL SHEATHING SHOWING REQUIRED STUD-TO-STUD NAILINGFIGURE R602.10.4.3(2) (Supp)CONTINUOUSLY SHEATHED BRACED WALL LINE WITHOUT CORNER RETURNFIGURE R602.10.4.3(3) (Supp)CONTINUOUSLY SHEATHED BRACED WALL LINE FIRSTBRACED WALL PANEL AWAY FROM END OF WALL LINE WITHOUT TIE DOWNFIGURE R602.10.4.3(4) (Supp)CONTINUOUSLY SHEATHED BRACED WALL LINE – FIRST BRACEDWALL PANEL AWAY FROM END OF WALL LINE WITH TIE DOWNR602.10.4.4 (Supp) Braced wall percentage. In addition to bracing percentage adjustments specified elsewhere inthis code, the braced wall percentages for Method 3 from Table 602.10.1(1) shall be permitted to be multiplied by afactor in accordance with Table R602.10.4.4.TABLE R602.10.4.4 (Supp)ADJUSTMENT FACTORS TO THE PERCENTAGE OF REQUIRED BRACING PER WALL LINE –CONTINUOUSLYSHEATHEDa. Percentage of bracing for continuous wood structural panel sheathing shall be based on Method 3 requirements.R602.10.4.5 (Supp) 4:1 aspect ratio segments at garage door openings used with continuous structural panelsheathing. A 4:1 aspect ratio shall be permitted for full-height sheathed wall segments on either side of garageopenings that support light frame roofs only, with roof covering dead loads of 3 psf (0.14 kN/m2) or less. For purposesof calculating the percentage of panel bracing required by Table R602.10.1(1), the length of the full height sheathingsegment shall be equal to its measured length. This option is limited to one wall of the garage.R602.10.4.6 (Supp) 6:1 aspect ratio segments used with continuous structural panel sheathing. Wall segmentshaving a maximum 6:1 height to width ratio shall be permitted to be built in accordance with Figure R602.10.4.6 Themaximum 6:1 height-to-width ratio is based on height being measured from top of header to the bottom of the wallsegment bottom-plate. For purposes of calculating the percentage of panel bracing required by Table R602.10.1(1),the width of the full-height sheathing segment shall be equal to its measured width. Corners at the ends of walls usingthis option shall be constructed in accordance with Figure R602.10.4.3(1). The reduction factors for continuouslybraced walls from Section R602.10.4.4 shall be applied when calculating applicable percentages of wall bracing. Thenumber of wall segments having a maximum 6:1 height to width ratio in a wall line shall not exceed four. In multi-storybuildings, wall segments having a maximum 6:1 height to width ratio are not permitted to be directly stacked vertically.For purposes of resisting wind pressures acting perpendicular to the wall, in accordance with Section R301.2, theminimum requirements of Figure R602.10.4.6 shall be sufficient for wind speeds less than 110 mph in ExposureCategory B. For Exposure Categories C and D, the header to jack stud strap requirements and the number ofadditional jack studs shall be in accordance with Table R602.10.4.6.R602.10.4.7 (Supp) Continuously-sheathed braced wall lines. Where a continuously-sheathed braced wall line isused in Seismic Design Categories D0, D1, and D2 or regions where the basic wind speed exceeds 100 miles per hour,all other exterior braced wall lines in the same story shall be continuously sheathed.IRC-RB212ICC PUBLIC HEARING ::: February 2008

FIGURE R602.10.4.6 (Supp)WALLS WITH 6:1 ASPECT RATIO USED WITH CONTINUOUS WOOD STRUCTURAL PANEL SHEATHINGTABLE R602.10.4.6 (Supp)HEADER TO JACK STUD STRAP AND THE NUMBER OF ADDITIONAL JACK STUDSREQUIRED FOR RESISTING WIND PRESSURES PERPENDICULAR TO 6:1 ASPECT RATIO WALLS LOCATEDIN WIND EXPOSURE CATEGORIES C AND Da. If 2x6 framing is used, then the required strap capacity may be multiplied by 0.65, but in no case shall therequired strap capacity be less than 1,000 lb.b. If 2x6 framing is used, then no additional framing shall be required.R602.10.4 Continuous sheathing. Braced wall lines with continuous sheathing shall be constructed in accordancewith this section. All braced wall lines along exterior walls on the same story shall be continuously sheathed.Exception: Within Seismic Design Categories A, B, and C or in regions where the basic wind speed is less than orequal to 100 mph, other bracing methods prescribed by this code shall be permitted on other braced wall lines onthe same story level or on any braced wall line on different story levels of the building.R602.10.4.1 Continuous sheathing braced wall panels. Continuous sheathing methods require structural panelsheathing to be used on all sheathable surfaces on one side of a braced wall line including areas above and belowopenings and gable end walls. Braced wall panels shall be constructed in accordance with one of the methods listedin Table R602.10.4.1. Different bracing methods, other than those listed in Table R602.10.4.1, shall not be permittedalong a braced wall line with continuous sheathing.TABLE R602.10.4.1CONTINUOUS SHEATHING ION CRITERIACS-WSPWood structural panel3/8"6d common (2"x0.113") nailsat 6" spacing (panel edges) andat 12" spacing (intermediate supports) or16 ga. x 1-3/4 staples:at 3” spacing (panel edges) and6” spacing (intermediate supports)CS-GWood structural paneladjacent to garageopenings and supportingroof load onlya,b3/8"See Method CS-WSPCS-PFContinuous portal frameSee SectionR602.10.4.1.1See Section R602.10.4.1.1For SI: 1 inch 25.4 mmApplies to one wall of a garage only.a.Roof covering dead loads shall be 3 psf (0.14 kN/m2) or lessb.R602.10.4.1.1 Continuous portal frame. Continuous portal frame braced wall panels shall be constructed inaccordance with Figure R602.10.4.1.1. The number of continuous portal frame panels in a single braced wall line shallnot exceed four. Continuous portal frame panels shall not be permitted to be directly stacked vertically in multi-storybuildings. For purposes of resisting wind pressures acting perpendicular to the wall, in accordance with SectionR301.2, the minimum requirements of Figure R602.10.4.1.1 shall be sufficient for wind speeds less than 110 mph inExposure Category B. For Exposure Categories C and D, the header to jack stud strap requirements and the numberof additional jack studs shall be in accordance with Table R602.10.4.1.1.ICC PUBLIC HEARING ::: February 2008IRC-RB213

FIGURE R602.10.4.1.1METHOD CS-PF: CONTINUOUS PORTAL FRAME PANEL CONSTRUCTIONIRC-RB214ICC PUBLIC HEARING ::: February 2008

TABLE R602.10.4.1.1HEADER TO JACK STUD STRAP AND THE NUMBER OF ADDITIONAL JACK STUDSREQUIRED FOR RESISTING WIND PRESSURES PERPENDICULAR TO CONTINUOUS PORTAL FRAMEPANELS LOCATED IN WIND EXPOSURE CATEGORIES C AND DWind Exposure Category CWall Height(ft)RequiredStrap Capacity(lb)aWind Exposure Category D90 mphless than 110mph85 mph90 mphless than 110mph10 and less85 0--12123Number of additional 2x4Jack Studsba. If 2x6 framing is used, then the required strap capacity may be multiplied by 0.65, but in no case shall the requiredstrap capacity be less than 1,000 lb.b. If 2x6 framing is used, then no additional framing shall be required.PANELLEN G PENINGWALL HEIGHTR602.10.4.2 Length of braced wall panels with continuous sheathing. Braced wall panels along a braced wallline with continuous sheathing shall be full-height with a length based on the adjacent clear opening height inaccordance with Table R602.10.4.2 and Figure R602.10.4.2. Within a braced wall line when a panel has an openingon either side of differing heights, the taller opening height shall be used to determine the panel length from TableR602.10.4.2. For Method CS-PF, wall height shall be measured from the top of the header to the bottom of the bottomplate as shown in Figure R602.10.4.1.1.PANELLENG THPANELLENG THFIGURE R602.10.4.2BRACED WALL PANELS WITH CONTINUOUS SHEATHINGTABLE R602.10.4.2LENGTH REQUIREMENTS FOR BRACED WALL PANELSWITH CONTINUOUS SHEATING aMETHODADJACENT CLEAR 2"96"100"104"108"112"116"120" 120" 120"WALL 30"33"36"39"42"45"48"51"54"57"60"30"20"For SI: 1 inch 25.4 mm, 1 foot 305 mma. Interpolation shall be permitted.ICC PUBLIC HEARING ::: February 2008IRC-RB215

R602.10.4.3 Percentage of bracing for continuous sheathing. Braced wall lines with continuous sheathing shall beprovided with braced wall panels in the percentage required in Table R602.10.1(1). Only those full-height braced wallpanels complying with the length requirements of Table R602.10.4.2 shall be permitted to contribute towards theminimum required percentage of bracing. In addition to bracing percentage adjustments specified elsewhere in thiscode, the braced wall percentages from Table 602.10.1(1) shall be permitted to be multiplied by a factor in accordancewith Table R602.10.4.3.TABLE R602.10.4.3ADJUSTMENT FACTORS TO THE PERCENTAGE OF REQUIREDBRACING PER BRACED WALL LINE WITH CONTINUOUS SHEATHINGMAXIMUM CLEAR OPENING HEIGHTIN A BRACED WALL LINEADJUSTMENT FACTOR85% of wall height67% of wall height0.90.8R602.10.4.4 Braced wall panel location and corner construction. For all continuous sheathing methods, fullheight braced wall panels complying with the length requirements of Table R602.10.4.2 shall be located at each end ofa braced wall line with continuous sheathing and at least every 25 feet (7620 mm) on center. A minimum 24 inch (610mm) wood structural panel corner return shall be provided at both ends of a braced wall line with continuous sheathingin accordance with Figures R602.10.4.4(1) and R602.10.4.4(2). In lieu of the corner return, a hold-down device with aminimum uplift design value of 800 lb (3560 N) shall be fastened to the corner stud and to the foundation or framingbelow in accordance with Figure R602.10.4.4(3).Exception: The first braced wall panel shall be permitted to begin 12.5 feet (3810 mm) from each end of thebraced wall line in Seismic Design Categories A, B, and C and 8 feet (2438 mm) in Seismic Design Categories D0,D1, and D2 provided one of the following is satisfied:1. A minimum 24 inch (610 mm) long, full-height wood structural panel is provided at both sides of a cornerconstructed in accordance with Figure R602.10.4.4(1) at the braced wall line ends in accordance with FigureR602.10.4.4(4), or2. The braced wall panel closest to the corner shall have a hold-down device with a minimum uplift designvalue of 800 lb (3560 N) fastened to the stud at the edge of the braced wall panel closest to the corner and tothe foundation or framing below in accordance with Figure R602.10.4.4(5).IRC-RB216ICC PUBLIC HEARING ::: February 2008

For SI: 1 inch 25.4 mm, 1 foot 305 mmFIGURE R602.10.4.4(1)TYPICAL EXTERIOR CORNER FRAMING FOR CONTINUOUS SHEATHINGICC PUBLIC HEARING ::: February 2008IRC-RB217

For SI: 1 foot 305 mmFIGURE R602.10.4.4(2)BRACED WALL LINE WITH CONTINUOUS SHEATHINGWITH CORNER RETURN PANELFor SI: 1 inch 25.4 mm, 1 pound 4.45 NFIGURE R602.10.4.4(3)BRACED WALL LINE WITH CONTINUOUS SHEATHINGWITHOUT CORNER RETURN PANELIRC-RB218ICC PUBLIC HEARING ::: February 2008

For SI: 1 inch 25.4 mmFIGURE R602.10.4.4(4)BRACED WALL LINE WITH CONTINUOUS SHEATHING – FIRST BRACED WALLPANEL AWAY FROM END OF WALL LINE WITHOUT TIE DOWNFor SI: 1 foot 305 mm, 1 pound 4.45 NFIGURE R602.10.4.4(5)BRACED WALL LINE WITH CONTINUOUS SHEATHING – FIRST BRACEDWALL PANEL AWAY FROM END OF WALL LINE WITH TIE-DOWNICC PUBLIC HEARING ::: February 2008IRC-RB219

Reason: The ICC Ad-Hoc Committee on Wall Bracing is proposing fourteen technical and non-technical code changes as we work through theprocess of making Section R602.10 of the 2009 IRC technically correct and easier to understand. The individual code changes are designed tostand alone if necessary, but the total body of work is respectively submitted as a comprehensive continuation of cycle 1 changes for the 2009 IRC.To see how the individual changes are intended to meld together, please visit the ICC web site, and review the composite document on the Ad hocCommittee on Wall Bracing page: s is a technical change to provide:-The continuous sheathing methods with distinct names, abbreviations and descriptions,-A table for determining the minimum panel length of bracing required when the panel is adjacent to a door or window,In many areas of the county, the co

IRC-RB210 ICC PUBLIC HEARING ::: February 2008 TABLE R602.10.1(1)a,b,c (Supp) WALL BRACING PERCENTAGE OF FULL-HEIGHT SEISMIC DESIGN BRACING PER WALL LINE CATEGORY (SDC) OR WIND SPEED STORIES ABOVE BRACED WALL LINEd METHOD OF BRACING PERMITTED For Method 3 and continuous sheathing methodsBracing For other methods .

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