2018 IRC Wood Wall Bracing (ABM) - Iccsafe

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2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions Handout2018 IRC Simplified WallBracing Provisions2018 International Residential Code (IRC )About you DesignersPlans examinersInspectorsBuildersContractorsArchitects & Engineers2018 IRC Simplified Wall Bracing Provisions31Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutDescription This seminar provides a comprehensive explanation ofthe 2018 International Residential Code (IRC )simplified wall bracing requirements. It guides theparticipant through an in-depth review and analysis ofthe bracing requirements for wood-framed residentialstructures.2018 IRC Simplified Wall Bracing Provisions4ObjectivesUpon completion, participants will be better ableto:1. Identify the forces that act on a house.2. Determine bracing materials available with simplifiedwall bracing.3. Apply simplified wall bracing provisions.4. Review connections required at floor and roof.2018 IRC Simplified Wall Bracing Provisions5Resourceswww.iccsafe.orgItem # 7102S182018 IRC Simplified Wall Bracing Provisions62Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutLateral ForcesLateral ForcesWindSeismic2018 IRC Simplified Wall Bracing Provisions8Lateral Forces – Wind SpeedWind Speed – USA2018 IRC Simplified Wall Bracing ProvisionsFigure R301.2(5)A93Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutLateral Forces – Wind Speed Las Vegas, NV 115 mph, no specialwind region2018 IRC Simplified Wall Bracing ProvisionsLateral Forces – Wind SpeedWind Design Required – USAFigure R301.2(4)B design required areas2018 IRC Simplified Wall Bracing ProvisionsFigure R301.2(5)Bhazards.atcouncil.org2018 IRC Simplified Wall Bracing Provisions11High WindRegions!124Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions Handouthazards.atcouncil.org2018 IRC Simplified Wall Bracing Provisions13Lateral Forces - Earthquakes2018 IRC Simplified Wall Bracing Provisions14Lateral Forces- EarthquakesSDS value0.744g SDC D1per Table R301.2.2.1.12018 IRC Simplified Wall Bracing Provisions155Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutLateral Forces- EarthquakesSDS value0.46g SDC Cper Table R301.2.2.1.12018 IRC Simplified Wall Bracing Provisions16Lateral ForcesEffects of ForcesRackingBase ShearOverturningResisted by BracingResisted by AnchorsResisted by hold-downs& Dead Load2018 IRC Simplified Wall Bracing Provisions17Lateral Forces – Effects of ForcesRackingResisted by Bracing2018 IRC Simplified Wall Bracing Provisions186Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutLateral Forces – Effects of ForcesRacking19Lateral Forces – Effects of ForcesSlidingResisted by AnchorsAnchors2018 IRC Simplified Wall Bracing Provisions20Lateral Forces – Effects of ForcesBase Shear217Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutLateral Forces – Effects of ForcesOverturningResisted by hold-downs& Dead Load2018 IRC Simplified Wall Bracing Provisions22Lateral Forces – Effects of ForcesOverturningFebruary 2008Macon Co.‘Super Tuesday’Tornado2018 IRC Simplified Wall Bracing Provisions23Simplified Wall Bracing8Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutSimplified Wall BracingPrescriptive LimitsExposureCategoryB or CSDC A or B,C fordwellingsMax. WindSpeed 130 mphWSP1, 2 or 3 storyBracedWall PanelMaterialSFB2018 IRC Simplified Wall Bracing Provisions25Simplified Wall BracingPrescriptive LimitsMax.WallHeight 10 ftMax. Eave toRidge Height 15 ftMax.Cantilever 24 in.BuildingLength2018 IRC Simplified Wall Bracing Provisions26Simplified Wall BracingProcedure:1. Draw a rectangle around the perimeter of the building2018 IRC Simplified Wall Bracing ProvisionsR602.12.1279Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutSimplified Wall BracingProcedure cont.:2. Determine type of bracing to use.2018 IRC Simplified Wall Bracing Provisions28Simplified Wall BracingBracing Methods for Simplified Wall BracingMaterialStud Spacing uralPanelTable R602.3(3)6" edge12" fieldStructuralFiberboardSheathingMax 16'' spacingTable R602.3(1)3" edge6" fieldBracing UnitMethodMinimumBracing UnitLength ent4a. Mixing of wood structural panel and structural fiberboard sheathing inone building is not permitted.b. Continuous and intermittent bracing units may be mixed from one storyto another.c. Continuous and intermittent bracing unit methods may not be mixedwithin one story.2018 IRC Simplified Wall Bracing ProvisionsR602.12.2, R602.12.329Panel Material - IntermittentMethod WSP – WoodStructural Panel 3/8" min. thickness Nailing per TableR602.3(3) for exterior,per Table R602.3(1) or(2) for interior walls Nail spacing 6:128' to 12'4' min.2018 IRC Simplified Wall Bracing ProvisionsTable R602.10.43010Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutPanel Material - IntermittentMethod WSP – Wood Structural Panel48"48"48"31Panel Material - ContinuousMethod CS-WSPFull-height sheathed wall segments having a length equal or greaterthan Table R602.10.5 are counted toward the total bracing length.Wall minimum length is based on wall height and height of the adjacentclear opening.Too Narrow2018 IRC Simplified Wall Bracing ProvisionsTable R602.10.532Simplified Wall BracingProcedure cont.:3. Identify the number of bracing units required oneach side of the rectangle.2018 IRC Simplified Wall Bracing Provisions3311Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutSimplified Wall BracingMinimum Number of Bracing Units on Each Side ofthe Circumscribed RectangleUltimateDesign WindSpeed (mph)StorylevelEave toridgeheight (ft)Minimum number of bracing Minimum number of bracingunits on each long sideunits on each short sideLength of short side (ft)Length of long side 1011515Table R602.12.42018 IRC Simplified Wall Bracing Provisions34Simplified Wall BracingMinimum Number of Bracing Units on Each Side ofthe Circumscribed RectangleUltimateDesign WindSpeed (mph)StorylevelEave toridgeheight (ft)Minimum number of bracing Minimum number of bracingunits on each long sideunits on each short sideLength of short side (ft)10 20 30 40 50 60Length of long side (ft)10 20 30 40 50 101113367101113232423322453356477810130152018 IRC Simplified Wall Bracing ProvisionsTable R602.12.435Simplified Wall BracingMinimum Number of Bracing Units on Each Side of theCircumscribed Rectangle - footnotesa. Interpolation shall not be permitted.b. Cripple walls and wood-framed basement walls first story,stories above redesignated.c. Actual lengths of the sides of the circumscribed rectangle shallbe rounded to the next highest unit of 10.d. For Exposure Category C, multiply bracing units by: 1.20 for a one-story building1.30 for a two-story building1.40 for a three-story building2018 IRC Simplified Wall Bracing ProvisionsTable R602.12.43612Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutSimplified Wall BracingProcedure cont.:4. Check that maximum distances between units andends of the wall are not exceeded.Distribution of Bracing Units Bracing unit within 12 feet of the ends of a wall. Bracing units edges within 20 feet of each other. Walls 8 feet in length must have at least one bracing unit.R602.12.52018 IRC Simplified Wall Bracing Provisions37Simplified Wall Bracing18ꞌ3ꞌ6ꞌ3ꞌ28ꞌDistributionof 2018 IRC Simplified Wall Bracing Provisions22ꞌ38Simplified Wall BracingProcedure cont.:5. Select additional narrow bracing options if needed.Narrow BracingMethodCS-GCS-PFPFHPFGABW2018 IRC Simplified Wall Bracing ProvisionsEquivalentBracing Units0.50.7510.751Each narrow bracingmethod is worth one-halfto one full 3 ft. or 4 ft.bracing unit.R602.12.63913Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutPanel Material - ContinuousMethod CS-GStandard Header4:1 Aspect Ratio (24" min.)2018 IRC Simplified Wall Bracing Provisions40Panel Material - ContinuousMethod CS-G Wood structural panel adjacent togarage opening Full-height sheathed wall segments to either side of garage openingsWhere walls support only roof load or gable end wallDead load 3psf in high seismic regionsApplied to one wall line of garage onlyPanel length bracing length4:1 aspect ratio12' maxGarageOpeningH/42018 IRC Simplified Wall Bracing ProvisionsTables R602.10.4, R602.10.541Panel Material - ContinuousMethod CS-PFStory above permittedExtended Header6:1 Aspect Ratio (16" min.)2018 IRC Simplified Wall Bracing ProvisionsR602.10.6.4, Table R602.10.54214Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutPanel Material - ContinuousMethod CS-PF Continuous portal frame No hold-downs required OK on raised floor Top of header at 10' max10' max(12' maxwithpony wall) Top of wall at 12' max Panel length 1.5 x bracinglength (SDC A-C)Fullysheathedwall lineGaragGarageeOpeningOpeningH/62018 IRC Simplified Wall Bracing ProvisionsR602.10.6.443Panel Material - ContinuousMethodCS-PFFigureR602.10.6.444Panel Material - ContinuousCS-GCS-PF44515Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutPanel Material - IntermittentMethod PFH – Intermittent Portal Frame with hold-downs 16" min panel length for 1-story, 24" min for 2-story Each vertical panel replaces a 48" braced wall panelOpeningOpeningPFHPFH8' to 10'PFHExtended header16" or 24" min.R602.10.6.2, Table R602.10.52018 IRC Simplified Wall Bracing Provisions46Panel Material - IntermittentMethod PFH – Intermittent Portal Frame with hold-downsExtended header1,000 lb strap capacity(opposite side from sheathing)10' Max.3" o.c. nailing in two rowsMin. 3/8" thick woodstructural panel3,500 lb strap type hold-down(2) bottom plates(1) 5/8" anchor bolt2018 IRC Simplified Wall Bracing ProvisionsFigure R602.10.6.247Panel Material - IntermittentMethod PFG – Intermittent Portal Frame at Garage For use in SDC A-C only Bracing length 1.5 x length ofpanel Minimum 24" length Single row of nails on studsExtendedheaderMin.1,000 lb strap(opposite sidefrom sheathing)No hold-downsrequired2018 IRC Simplified Wall Bracing ProvisionsR602.10.6.3, Table R602.10.54816Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutPanel Material - IntermittentMethod PFG – Intermittent Portal Frame at GarageExtended header3" o.c. nailing1,000 lb strapcapacity(opposite side)Min. 7/16" thickwood structuralpanelNo hold-downs requiredSingle sole plate allowed(2) 1/2" anchor bolts and min. 2" x2" x 3/16" plate washersFigure R602.10.6.32018 IRC Simplified Wall Bracing Provisions49Panel Material - IntermittentMethod ABW - Alternate Braced WallMin. 3/8" thick wood structuralpanel sheathingWind8' to 12'Anchor bolts 1/2" (2)SDC D0, D1and D2Hold-down capacity perTable R602.10.6.18' to 10'12" x 12" min. footing#4 bars top and bottom2018 IRC Simplified Wall Bracing ProvisionsFigure R602.10.6.150Panel Material - IntermittentMethod ABW - Alternate Braced WallMinimum Hold-down Forces For Method ABW Braced Wall Panels– Table R602.10.6.1Seismic DesignCategory andWind SpeedSDC A, B and CUltimate design windspeed 140 mphSDC Do, D1 and D2Ultimate design windspeed 140 mphSupporting/Story8 ft.Hold Down Force (lbs)Height of Braced Wall Panel9 ft.10 ft.11 ft.12 ft.One story1,8001,8001,8002,0002,200First of two stories3,0003,0003,0003,3003,600One story1,8001,8001,800NPNPFirst of two stories3,0003,0003,000NPNP2018 IRC Simplified Wall Bracing ProvisionsTable R602.10.6.15117Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutSimplified Wall BracingProcedure cont.:6. Check connection to roof.2018 IRC Simplified Wall Bracing ProvisionsConnectionsBWP Connection Requirements to Roof FramingSDCWind SpeedSDC A, B, CDistance (bottomof roof sheathing totop of plate)9.25" or lessNot required, attach per R602.3(1)9.25" to 15.25"SDC D0, D1, D215.25" or lessAll SDCs15.25" to 48"BlockingPer R602.10.8.2.2 Item 1 andFigure R602.10.8.2(1)Per R602.10.8.2 Item 2 and FigureR602.10.8.2(1)Per R602.10.8.2 Item 3 and FigureR602.10.8.2(2) or R602.10.8.2(3) orengineered designR602.10.8.22018 IRC Simplified Wall Bracing Provisions53ConnectionsBWP Perpendicular to Rafters or Roof TrussesFor SDC A, B and C, Where distance from top of therafters to perpendicular top platesis 9.25″ and 15.25″. Connect rafters to top plates ofbraced wall panels with blocking[Figure R602.10.8.2(1) and TableR602.3(1)].2018 IRC Simplified Wall Bracing ProvisionsFigure R602.10.8.2(1)5418Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutConnectionsBWP Perpendicular to Rafters or Roof TrussesFor SDC D0, D1 and D2, Where distance from top ofrafters or roof trusses toperpendicular top plates is 15.25″ Connect rafters to the topplates of braced wall panelswith blocking [FigureR602.10.8.2(1) and TableR602.3(1)]Figure R602.10.8.2(1)2018 IRC Simplified Wall Bracing Provisions55ConnectionsBWP Perpendicular to Rafters or Roof TrussesFor all Seismic DesignCategories, Where distance from top ofrafters or roof trusses toperpendicular top plates is 15.25″ Connect rafters to the topplates of braced wall panelsRoof Trusses[Figure R602.10.8.2(2) orper R802.10Figure R602.10.8.2(3)]Figure R602.10.8.2(2)2018 IRC Simplified Wall Bracing Provisions56ConnectionsBWP Perpendicular to Rafters or Roof TrussesBracing2018 IRC Simplified Wall Bracing ProvisionsRoofTrusses perR802.10Figure R602.10.8.2(3)5719Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutExamplesExample 1: 115 mph, Exp BExample SDC BWind 115 mph, Wind Exposure BMethod CS-WSP1 StoryWalls - 9 ft.Eave to ridge height - 12 ft.OneStory115 SDCmphBNAExample Highlights: Strategic placement of bracing units2018 IRC Simplified Wall Bracing Provisions59Step 1: Draw a Rectangle59'-8"1. Draw rectanglearound theentire building2. Check thelength of theN-S and E-Wsides the ofrectangle49'-4"Less than 60ft.?OK2018 IRC Simplified Wall Bracing Provisions20Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutStep 2: Determine bracing material Intermittent Continuous sheathing 4 ft segments WSP 3 ft segments WSPCS-WSP2018 IRC Simplified Wall Bracing ProvisionsStep 3: Determine bracing requiredTable R602.12.4 Minimum Number of Bracing mum number ofEave to Minimum number of bracing bracing units on each shortunits on each long sideridgesideheightLength of short side (ft)Length of long side (ft)(ft)10 20 30 40 50 60 10 20 30 40 50 60151233441233442345672345672456792456792018 IRC Simplified Wall Bracing Provisions62Step 4: Check panel spacingDistribution of Bracing Units Bracing unit within 12 feet of the ends of a wall. Bracing units edges within 20 feet of each other. Walls 8 feet in length must have at least one bracingunit.2018 IRC Simplified Wall Bracing ProvisionsR602.12.56321Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutNorth – South walls8'-2"14'4'CSWSP24'-6"CSWSP9'CSWSPCSWSP1. 4 bracing unitsrequired alongeach wall line2. With CS-WSP,the minimumbracing unitlength is 3 ft.3. Panels must bewithin 12 ft. of theend of wall lineand within 20 ft.of one another.CSWSPCSWSPNeed a narrowpanel solution!CSWSP18'8'-2"24'CSWSP9'-6"East – West walls1. 4 bracing units required along each wall line2. With CS-WSP, the minimum bracing unit length is 3 ft.3. Panels must be within 12 ft. of the end of wall line and within 20 ft. of one 9'-4"6'-8"CSWSPCSWSP17'-6"25'-6"CSWSPNo narrowpanels '-6"What aboutthis area?CSWSPCSWSP22Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions WSPCSWSPCSWSPCSWSPStep 5: Check for areas needingnarrow panels Add narrow panels to garage – preferably aportal frame without hold-downs2018 IRC Simplified Wall Bracing 10'-2"CSPFCSPF18'19'-6"12'CSWSP23Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutStep 6: Check roof connections2018 IRC Simplified Wall Bracing ProvisionsExample 2: 115 mph, Exp CExampleSDC BWind 115 mph, Wind Exposure CMethod CS-WSP1 StoryWalls - 9 ft.Eave to ridge height - 12 ft. OneStory115 SDCmphBNAExample Highlights: Exposure Category C requirements2018 IRC Simplified Wall Bracing Provisions7159'-8"1. Drawrectanglearound theentirebuilding49'-4"2. Check thelength ofthe N-S andE-W sidesthe ofrectangleLess than60 ft.?OK24Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutBracing: Simplified Wall BracingTable R602.12.4 Minimum Number of Bracing UnitsUltimateDesignWindSpeed(mph)StorylevelMinimum number ofEave to Minimum number of bracing bracing units on each shortunits on each long sideridgesideheightLength of short side (ft)Length of long side (ft)(ft)10 20 30 40 50 60 10 20 30 40 50 60115151233441233442345672345672456792456792018 IRC Simplified Wall Bracing Provisions73Bracing: Simplified Wall BracingTable R602.12.4 footnotesFor Exposure Category C, multiply bracing units by a factor of 1.20for a one-story building, 1.30 for a two-story building and 1.40 for athree-story building.Minimum bracing units in each direction 4 units x 1.20 4.8 unitsCall it 5 units2018 IRC Simplified Wall Bracing Copyright 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions Handout17'-2"17'CSWSP12'31'-6"CSWSPCSWSPCSWSPNorth side of dwelling: 5 unitsSouth side of dwelling:3 3 x 0.75 5.25 ht 2019 International Code Council

2018 IRC Simplified Wall Bracing Provisions2019 ICC Annual ConferenceEducational Sessions HandoutExample 3: 115 mph, Ex

115 mph, no special wind region 2018 IRC Simplified Wall Bracing Provisions Lateral Forces –Wind Speed Figure R301.2(4)B design required areas 2018 IRC Simplified Wall Bracing Provisions 11 Wind Design Required –USA Figure R301.2(5)B hazards.atcouncil.org 2018 IRC Simplified Wall Bracing Provisions 12 High Wind Regions!

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