ICC Guideto2018IRCWoodWallBracing 2018.pdf
$25.32
A Guide to the 2018 IRC Wood Wall Bracing Provisions
| Published By | Publication Date | Number of Pages |
| ICC | 2018 | 291 |
2020 City of Los Angeles amendment pages for integration with the 2019 California Building Code
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | A GUIDE TO THE 2018 IRC® WOOD WALL BRACING PROVISIONS |
| 2 | COPYRIGHT |
| 3 | TABLE OF CONTENTS |
| 5 | PREFACE |
| 7 | INTERNATIONAL CODE COUNCIL APA – THE ENGINEERED WOOD ASSOCIATION |
| 8 | HOW TO USE THIS GUIDE |
| 9 | CHAPTER 1 WALL BRACING: WHY IT’S NEEDED AND HOW IT WORKS |
| 10 | VERTICAL LOADS LATERAL LOADS |
| 11 | WIND FORCES FIGURE 1.1 WIND FORCES ACTING ON A STRUCTURE |
| 12 | FIGURE 1.2 MAP OF ULTIMATE DESIGN WIND SPEEDS FIGURE 1.3 MAP OF REGIONS THAT REQUIRE WIND DESIGN |
| 13 | SEISMIC FORCES FIGURE 1.4 EARTHQUAKE FORCES ACTING ON A STRUCTURE |
| 14 | FIGURE 1.5 PORTION OF SEISMIC DESIGN CATEGORIES-SOIL SITE CLASS A, B, OR D MAP |
| 15 | DETERMINING WIND AND SEISMIC REQUIREMENTS |
| 16 | IMPORTANT TERMINOLOGY |
| 17 | WHAT IS THE LATERAL LOAD PATH? FIGURE 1.6 CRITICAL PARTS AND FLOW OF THE LOAD PATH |
| 18 | WHAT IS THE VERTICAL LOAD PATH? FIGURE 1.7 EXAMPLE OF VERTICAL LOAD PATH |
| 19 | CRITICAL PARTS OF THE LATERAL LOAD PATH 1. THE RECEIVING WALL |
| 20 | FIGURE 1.8 WALL COVERING IS AN ESSENTIAL PART OF THE FIRST STEP OF THE LOAD PATH FOR WIND. THE WALL STUDS CAN BE SEEN BEHIND THE FAILED WALL COVERING SYSTEM. THE FAILURE COULD HAVE BEEN DUE TO VARIOUS REASONS. APPROVED WALL COVERINGS INSTALLED PER CODE WOULD MOST LIKELY HAVE BEEN ABLE TO WITHSTAND THE PRESSURE OF THE WIND. FIGURE 1.9 NOT ALL WALL COVERINGS ARE BY THEMSELVES CAPABLE OF RESISTING CODE-REQUIRED WIND PRESSURES (SEE IRC TABLE R301.2(2)). THIS HOUSE WAS SUBJECTED TO AN 85 MPH WIND. FAILURE COULD HAVE BEEN DUE TO MULTIPLE ISSUES, INCLUDING IMPROPER INSTALLATION, FLYING OBJECT DAMAGE OR EVEN INSUFFICIENT STRUCTURAL INTEGRITY OF THE WALL SHEATHING USE. FIGURE 1.10 THE HOUSE IN FIGURE 1.10 DISPLAYS A PARTIAL FAILURE OF THE WALL COVERING SYSTEM. IN THIS CASE, IT WAS BRICK VENEER INADEQUATELY ATTACHED TO FRAMING/SHEATHING. |
| 21 | 2. CONNECTIONS AT TOP AND BOTTOM OF RECEIVING WALL 3. FLOOR AND ROOF DIAPHRAGM FIGURE 1.11 THE LOSS OF SHEATHING COMPROMISES THE STRENGTH OF THE ROOF DIAPHRAGM. ROOF SHEATHING EDGE NAILING |
| 22 | 4. ROOF-TO-WALL/ WALL-TO-WALL CONNECTIONS FIGURE 1.12 LACK OF DIAPHRAGM ACTION ON SPACED BOARD FIGURE 1.13 LEEWARD FORCE REMOVED THE NON-STRUCTURAL SHEATHING |
| 23 | FIGURE 1.14 INSUFFICIENT ATTACHMENT OF VINYL SIDING FIGURE 1.15 TOTAL LOSS OFF THE STRUCTURAL ROOF DIAPHRAGM 5. WALL BRACING |
| 24 | FIGURE 1.16 FAILURES IN WALL BRACING AS INDICATED BY WALL RACKING 6. WALL TO FOUNDATION CONNECTIONS FIGURE 1.17 INSUFFICIENT ANCHORAGE OF THE WALLS TO THE FOUNDATION |
| 25 | FIGURE 1.18 NEGLIGIBLE CONNECTION OF THE SILL PLATE TO THE FOUNDATION FIGURE 1.19 SLAB FLOOR REMAINS WITH HOUSE REMOVED BY HIGH WIND |
| 26 | THE SOLUTION FIGURE 1.20 GOOD FRIDAY EARTHQUAKE IN ALASKA FIGURE 1.21 HURRICAN ANDREW |
| 27 | WHAT’S THE DIFFERENCE BETWEEN A BRACED WALL PANEL AND SHEAR WALL? WHAT IS BRACING AND HOW DOES IT WORK? FIGURE 1.22 BARE STUD WALL HAS NO LATERAL LOAD RESISTING CAPACITY |
| 28 | LET-IN BRACING |
| 29 | FIGURE 1.23 STUD WALL WITH LET-IN BRACE PANEL-TYPE BRACING (AND PORTLAND CEMENT LATH AND PLASTER) |
| 30 | FIGURE 1.24 RECTANGULAR PANEL PRODUCTS FIGURE 1.25 STUD WALL WITH PANEL BRACING |
| 31 | HISTORY OF WLAL BRACING |
| 32 | WHY DO BRACING REQUIREMENTS CHANGE? FIGURE 1.26 A TYPICAL SINGLE FAMILY RESIDENCE BUILT IN THE 1960S AND EARLIER FIGURE 1.27 A TYPICAL SINGLE-FAMILY RESIDENCE BUILT TODAY |
| 33 | LOADS AND LIMITS OF THE INTERNATIONAL RESIDENTIAL CODE |
| 34 | THE SCOPE OF THE IRC |
| 37 | CHAPTER 2 OTHER RELATED PROVISIONS |
| 38 | R106 R106.1.3 INFORMATION ON BRACED WALL DESIGN R109 R109.1.4 FRAME AND MASONRY INSPECTION R202 DEFINITIONS |
| 41 | FIGURE 2.1 PLANS A AND B MEET TOWNHOUSE REQUIREMENTS FIGURE 2.2 CONFIGURATION NOT COVERED BY THE IRC |
| 42 | R301 R301.2.1 WIND DESIGN CRITERIA TABLE 2.1 LOCAL CLIMATIC AND GEOGRAPHIC CRITERIA |
| 44 | R301.2.1.1 WIND LIMITATIONS AND WIND DESIGN REQUIRED |
| 45 | TABLE 2.2 APPLICABLE DESIGN STANDARDS |
| 46 | TABLE 2.3 WIND SPEED CONVERSIONS R301.2.1.4 EXPOSURE CATEGORY |
| 47 | FIGURE 2.3 EXPOSURE CATEGORY B FIGURE 2.4 EXPOSURE CATEGORY C |
| 48 | FIGURE 2.5 EXPOSURE CATEGORY C (CONTINUED) FIGURE 2.6 EXPOSURE CATEGORY D |
| 49 | R301.2.2 SEISMIC PROVISIONS TABLE 2.4 SCOPE OF SEISMIC PROVISIONS R301.2.2.1 DETERMINATION OF SEISMIC DESIGN CATEGORY R301.2.2.1.1 ALTERNATE DETERMINATION OF SEISMIC DESIGN CATEGORY |
| 50 | R301.2.2.1.2 ALTERNATIVE DETERMINATION OF SEISMIC DESIGN CATEGORY E |
| 51 | R301.2.2.2 WEIGHTS OF MATERIALS |
| 52 | TABLE 2.5 BRACING ADJUSTMENT FACTORS BASED ON WEIGHTS OF CONSTRUCTION MATERIALS FIGURE 2.7 MAXIMUM DEAD LOAD WEIGHTS |
| 53 | R301.2.2.3 STONE AND MASONRY VENEER R301.2.2.6 IRREGULAR BUILDINGS |
| 55 | FIGURE 2.8 IRREGULARITY #1 BRACED WALL PANELS WITH VERTICAL IRREGULARITIES |
| 56 | FIGURE 2.9 EXCEPTION TO IRREGULARITY #2 PORTIONS OF FLOOR OR ROOF NOT SUPPORTED ARE PERMITTED TO EXTEND UP TO 6 FEET |
| 57 | FIGURE 2.10 IRREGULARITY #3 BRACED WALL PANEL OVER OPENINGS |
| 58 | TABLE 2.6 HEADER REQUIREMENTS TO EXEMPT IRREGULARITY #3 FIGURE 2.11 IRREGULARITY #4 EXCESSIVE HOLE IN ROOF OR FLOOR SHEATHING AND FRAMING |
| 59 | FIGURE 2.12 IRREGULARITY #5 OFFSET IN FLOOR FRAMING |
| 60 | FIGURE 2.13 IRREGULARITY #6 BRACED WALL LINES NOT AT RIGHT ANGLES TO EACH OTHER R301.3 STORY HEIGHT |
| 61 | FIGURE 2.14 STORY HEIGHT MEASUREMENT FOR WOOD, STRUCTURAL INSULATED PANELS, AND COLD-FORMED STEEL FRAMING |
| 62 | R302 FIRE-RESISTANT CONSTRUCTION R302.6 DWELLING/GARAGE FIRE SEPARATION R403 FOOTINGS R403.1 GENERAL R403.1.2 CONTINUOUS FOOTING IN SEISMIC DESIGN CATEGORIES |
| 63 | FIGURE 2.15 SINGLE STORY FOUNDATION SUPPORT IN SDC D2 |
| 64 | FIGURE 2.16 TWO STORY FOUNDATION SUPPORT IN SDC D2 FIGURE 2.17 BRACED WALL SPACING |
| 65 | R403.1.3.4 INTERIOR BEARING AND BRACED WALL PANEL FOOTINGS IN SEISMIC DESIGN CATEGORIES D0, D1 AND D2. R403.1.6 FOUNDATION ANCHORAGE |
| 66 | R403.1.6.1 FOUNDATION ANCHORAGE IN SEISMIC DESIGN CATEGORIES C, D0, D1 AND D2 R404 FOUNDATION AND RETAINING WALLS R404.1.9.3 MASONRY PIERS SUPPORTING BRACED WALL PANELS |
| 67 | R502 WOOD FLOOR FRAMING R502.2.1 FRAMING AT BRACED WALL LINES R502.3.3 FLOOR CANTILEVERS R602 WOOD WALL FRAMING TABLE R602.3(1) FASTENING SCHEDULE TABLE 2.7 FASTENING SCHEDULE – WALL SECTION |
| 68 | TABLE 2.7(Continued) FASTENING SCHEDULE – WALL SECTION |
| 69 | TABLE 2.8 REQUIREMENTS FOR WOOD STRUCTURAL PANEL WALL SHEATHING USED TO RESIST WIND PRESSURES R602.3.5 BRACED WALL PANEL UPLIFT LOAD PATH |
| 70 | R602.7 HEADERS TABLE 2.9 GIRDER SPANS AND HEADER SPANS FOR EXTERIOR BEARING WALLS (EXCERPTED) |
| 71 | TABLE 2.9 (CONTINUED) GIRDER SPANS AND HEADER SPANS FOR EXTERIOR BEARING WALLS (EXCERPTED) |
| 72 | TABLE 2.9 (CONTINUED) GIRDER SPANS AND HEADER SPANS FOR EXTERIOR BEARING WALLS (EXCERPTED) |
| 73 | R602.7.2 RIM BOARD HEADERS R602.7.5 SUPPORTS FOR HEADERS TABLE 2.10 GIRDER SPANS MINIMUM NUMBER OF FULL HEIGHT STUDS AT EACH END OF HEADERS IN EXTERIOR WALLS |
| 74 | R602.9 CRIPPLE WALLS R610 STRUCTURAL INSULATED PANEL WALL CONSTRUCTION R610.5.5 WALL BRACING R703 EXTERIOR COVERING R703.8 ANCHORED STONE AND MASONRY VENEER GENERAL |
| 75 | R802 WOOD ROOF FRAMING R802.8 LATERAL SUPPORT R802.10.3 BRACING R802.11 ROOF TIE DOWN R802.11.1 UPLIFT RESISTANCE R802.11.1.1 TRUSS UPLIFT RESISTANCE |
| 76 | R802.11.1.2 RAFTER UPLIFT RESISTANCE R806.1 VENTILATION REQUIRED |
| 77 | CHAPTER 3 2018 IRC BRACING PROVISIONS |
| 79 | R602.10 WALL BRACING FIGURE 3.1 BRACED WALL PANELS, BRACED WALL PANEL SPACING, BRACED WALL LINES AND BRACED WALL LINE SPACING |
| 80 | R602.10.1 BRACED WALL LINES R602.10.1.1 LENGTH OF A BRACED WALL LINE R602.10.1.2 OFFSETS ALONG A BRACED WALL LINE |
| 81 | FIGURE 3.2 OFFSETS ALONG A BRACED WALL LINE AND EFFECTIVE BRACED WALL LINES |
| 82 | EFFECTIVE (IMAGINARY) BRACED WALL LINES FIGURE 3.3 EFFECTIVE BRACED WALL LINE |
| 83 | R602.10.1.3 SPACING OF BRACED WALL LINES TABLE 3.1 BRACED WALL LINE SPACING FOR VARIOUS CONDITIONS |
| 84 | R602.10.1.4 ANGLED WALLS FIGURE 3.4 ANGLED WALLS IN BRACED WALL LINES |
| 85 | TABLE 3.2 PROJECTED BRACED WALL LINE LENGTH CONTRIBUTED BY THE ANGLED WALL FIGURE 3.5 INSUFFICIENT ROOM IN ANGLED PORTION OF WALL TO PERMIT BRACING |
| 86 | FIGURE 3.6 ANGLED PORTION OF WALL GREATER THAN 8 FEET R602.10.2 BRACED WALL PANELS |
| 87 | R602.10.2.1 BRACED WALL PANEL UPLIFT LOAD PATH R602.10.2.2 LOCATIONS OF BRACED WALL PANELS FIGURE 3.7 DISTANCE BETWEEN BRACED WALL PANELS-ANY SEGMENT LENGTH |
| 88 | R602.10.2.2.1 LOCATION OF BRACED WALL PANELS IN SEISMIC DESIGN CATEGORIES D0, D1 AND D2 FIGURE 3.8 FOR SDC D0 , D1 AND D2 THREE OPTIONS EXIST FOR BRACING AWAY FROM CORNERS |
| 89 | R602.10.2.3 MINIMUM NUMBER OF BRACED WALL PANELS |
| 90 | R602.10.3 REQUIRED LENGTH OF BRACING |
| 92 | FIGURE 3.9 WALL BRACING WIND LOADS FIGURE 3.10 WALL BRACING SEISMIC LOADS |
| 93 | FIGURE 3.11 BASIS FOR WIND BRACING TABLE |
| 94 | TABLE 3.3 UNADJUSTED WIND BRACING REQUIREMENTS |
| 95 | TABLE 3.3 (Continued) UNADJUSTED WIND BRACING REQUIREMENTS |
| 96 | TABLE 3.3 (Continued) UNADJUSTED WIND BRACING REQUIREMENTS |
| 97 | TABLE 3.4 ADJUSTMENT FACTORS TO THE REQUIRED WIND BRACING DETERMINED IN TABLE 3.3 |
| 98 | TABLE 3.4 (Continued) ADJUSTMENT FACTORS TO THE REQUIRED WIND BRACING DETERMINED IN TABLE 3.3 |
| 99 | FIGURE 3.12 ROOF EAVE-TO-RIDGE HEIGHT |
| 100 | FIGURE 3.13 EAVE-TO-RIDGE HEIGHT |
| 101 | FIGURE 3.14 BRACED WALL LINE SPACING |
| 102 | NUMBER OF BRACED WALL LINES EXAMPLE TWO BRACED WALL LINES 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14A BRACED WALL LINE SPACING THREE BRACED WALL LINES 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14B BRACED WALL LINE SPACING |
| 103 | FOUR BRACED WALL LINES 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14C BRACED WALL LINE SPACING FIVE BRACED WALL LINES 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14D BRACED WALL LINE SPACING |
| 104 | THREE BRACED WALL LINES – TRADITIONAL BWL SPACING CALCULATION 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14E BRACED WALL LINE SPACING THREE BRACED WALL LINES – AVERAGE BWL SPACING CALCULATION 115 mph, Wind Exposure Category B, Method WSP FIGURE 3.14F BRACED WALL LINE SPACING |
| 106 | APPLICATION OF ADJUSTMENT FACTORS FIGURE 3.15 BASIS FOR SEISMIC BRACING TABLE |
| 107 | TABLE 3.5 UNADJUSTED SEISMIC BRACING REQUIREMENTS |
| 108 | TABLE 3.5 (Continued) UNADJUSTED SEISMIC BRACING REQUIREMENTS |
| 110 | TABLE 3.6 ADJUSTMENT FACTORS TO THE REQUIRED SEISMIC BRACING DETERMINED IN TABLE 3.5 |
| 114 | EXAMPLES: DETERMINING LENGTH OF BRACING EXAMPLE 3.1: SDC A, WIND EXPOSURE B, 130 MPH (Ultimate Design Wind Speed) FIGURE 3.16 EXAMPLE USING METHOD SFB |
| 115 | EXAMPLE 3.2: SDC D1, WIND EXPOSURE B, 130 MPH (Ultimate Design Wind Speed) FIGURE 3.17 EXAMPLE USING METHOD SFB |
| 117 | EXAMPLE 3.3: SDC D2, WIND EXPOSURE B, 115 MPH (Ultimate Design Wind Speed) FIGURE 3.18 EXAMPLE USING METHOD PBS |
| 120 | EXAMPLE 3.4: SDC A, WIND EXPOSURE B, 115 MPH (Ultimate Design Wind Speed) FIGURE 3.19 EXAMPLE USING METHOD HPS |
| 122 | EXAMPLE 3.5: SDC B, WIND EXPOSURE C, 135 MPH (Ultimate Design Wind Speed) FIGURE 3.20 EXAMPLE USING METHOD PCP |
| 124 | FIGURE 3.21 ADDING A BRACED WALL LINE TO THE INTERIOR OF THE STRUCTURE TO REDUCE BRACING ON EXTERIOR WALL LINES |
| 126 | EXAMPLES: DETERMINING LENGTH OF BRACING WHEN USING NARROW-WIDTH PANELS EXAMPLE 3.6: SDC C, WIND EXPOSURE B, 115 MPH (Ultimate Design Wind Speed) FIGURE 3.22 EXAMPLE USING METHOD CS-G SHEATHED WOOD STRUCTURAL PANEL ADJACENT TO GARAGE OPENINGS |
| 128 | EXAMPLE 3.7: SDC A, WIND EXPOSURE B, 120 MPH (Ultimate Design Wind Speed) FIGURE 3.23 EXAMPLE USING METHOD CS-SFB |
| 130 | EXAMPLE 3.8: SDC B, WIND EXPSURE C, 110 MPH FIGURE 3.24 EXAMPLE USING METHOD CS-PF AT GARAGE WALL |
| 132 | EXAMPLE 3.9: SDC C, WIND EXPOSURE C, 115 MPH (Ultimate Design Wind Speed) FIGURE 3.25 EXAMPLE USING METHOD CS-PF (CONTINUOUSLY SHEATHED PORTAL FRAME) AT OFFSET WALL LINE |
| 135 | EXAMPLE 3.10: SDC B, WIND EXPOSURE B, 115 MPH (Ultimate Design Wind Speed) FIGURE 3.26 EXAMPLE USING METHOD PFG |
| 137 | EXAMPLE 3.11: SDC D2, WIND EXPOSURE C, 130 MPH (Ultimate Design Wind speed) FIGURE 3.27 EXAMPLE USING METHOD PFH WITH HOLD-DOWNS AT GARAGE WALL |
| 140 | R602.10.4 CONSTRUCTION METHODS FOR BRACED WALL PANELS INTERMITTENT BRACING METHODS |
| 141 | FIGURE 3.28 EXAMPLE OF “INTERMITTENT” METHOD WSP BRACED WALL PANEL TABLE 3.7 INTERMITTENT BRACING METHODS |
| 142 | TABLE 3.7 (Continued) INTERMITTENT BRACING METHODS |
| 143 | METHOD LIB (LET-IN BRACING) TABLE 3.8 METHOD LIB FIGURE 3.29 METHOD LIB |
| 144 | METHOD DWB (DIAGONAL WOOD BOARDS) TABLE 3.9 METHOD DWB FIGURE 3.30 METHOD DWB |
| 145 | METHOD WSP (WOOD STRUCTURAL PANEL) TABLE 3.10 METHOD WSP FIGURE 3.31 METHOD WSP |
| 146 | METHOD BV-WSP (WOOD STRUCTURAL PANELS WITH STONE OR MASONRY VENEER) TABLE 3.11 METHOD BV-WSP |
| 147 | FIGURE 3.32 METHOD BV-WSP METHOD SFB (STRUCTURAL FIBERBOARD SHEATHING) TABLE 3.12 METHOD SFB |
| 148 | FIGURE 3.33 METHOD SFB METHOD GB (GYPSUM BOARD) TABLE 3.13 METHOD GB |
| 149 | FIGURE 3.34 METHOD GB FIGURE 3.35 METHOD GB |
| 150 | TABLE 3.14 FASTENER DESCRIPTION FOR METHOD GB TABLE 3.15 FASTENER DESCRIPTION FOR METHOD GB |
| 151 | METHOD PBS (PARTICLEBOARD SHEATHING) TABLE 3.16 METHOD PBS FIGURE 3.36 METHOD PBS |
| 152 | METHOD PCP (PORTLAND CEMENT PLASTER) TABLE 3.17 METHOD PCP FIGURE 3.37 METHOD PCP R703.7 EXTERIOR PLASTER STUCCO R703.7.1 LATH |
| 153 | METHOD HPS (HARDBOARD PANEL SIDING) TABLE 3.18 METHOD HPS FIGURE 3.38 METHOD HPS |
| 154 | METHOD ABW (ALTERNATE BRACED WALL) TABLE 3.19 METHOD ABW |
| 155 | METHOD PFH (PORTAL FRAME WITH HOLD-DOWNS) TABLE 3.20 METHOD PFH |
| 156 | METHOD PFG (PORTAL FRAME AT GARAGE DOOR OPENINGS IN SEISMIC DESIGN CATEGORIES A, B AND C) TABLE 3.21 METHOD PFG |
| 157 | CONTINUOUS SHEATHING BRACING METHODS TABLE 3.22 CONTINUOUS SHEATHING BRACING METHODS |
| 158 | FIGURE 3.39 EXAMPLE OF CONTINUOUSLY SHEATHED BRACED WALLS |
| 159 | METHOD CS-WSP (CONTINUOULY SHEATHED WOOD STRUCTURAL PANEL) TABLE 3.23 METHOD CS-WSP |
| 160 | FIGURE 3.40 METHOD CS-WSP (CONTINUOUSLY SHEATHED WOOD STRUCTURNAL PANEL) |
| 161 | METHOD CS-G (CONTINUOUSLY SHEATHED WOOD STRUCTURAL PANEL ADJACENT TO GARAGE OPENINGS) TABLE 3.24 METHOD CS-G FIGURE 3.41 METHOD CS-G (CONTINUOUSLY SHEATHED WOOD STRUCTURAL PANEL ADJACENT TO GARAGE OPENINGS) |
| 162 | METHOD CS-PF (CONTINUOUSLY SHEATHED PORTAL FRAME) |
| 163 | TABLE 3.25 METHOD CS-PF FIGURE 3.42 METHOD CS-PF (CONTINUOULY SHEATHED PORTAL FRAME) |
| 164 | METHOD CS-SFB (CONTINUOUSLY SHEATHED STRUCTURAL FIBERBOARD) TABLE 3.26 METHOD CS-SFB |
| 165 | R602.10.4.1 MIXING METHODS |
| 167 | TABLE 3.27 MIXING POSSIBILITIES AND THEIR LIMITATIONS R602.10.4.2 CONTINUOUS SHEATHING METHODS |
| 168 | r602.10.4.3 BRACED WALL PANEL INTERIOR FINISH MATERIAL R602.10.4.4 PANEL JOINTS |
| 170 | R602.10.5 MINIMUM LENGTH OF A BRACED WALL PANEL TABLE 3.28 MINIMUM LENGTH OF BRACED WALL PANELS AND CONTRIBUTING LENGTH |
| 171 | TABLE 3.28 MINIMUM LENGTH OF BRACED WALL PANELS AND CONTRIBUTING LENGTH FIGURE 3.43 PANEL LENGTHS-CONTINUOUS SHEATHING |
| 172 | R602.10.5.1 CONTRIBUTING LENGTH |
| 173 | R602.10.5.2 PARTIAL CREDIT TABLE 3.29 PARTIAL CREDIT FOR INTERMITTENT BRACED WALL PANELS LESS THAN 48 INCHES IN LENGTH |
| 174 | R602.10.6 CONSTRUCTION OF METHODS ABW, PFH, PFG, CS-PF AND BV-WSP R602.10.6.1 METHOD ABW: ALTERNATE BRACED WALL PANELS |
| 175 | FIGURE 3.44 METHOD ABW-ALTERNATE BRACED WALL PANEL |
| 176 | TABLE 3.30 SIZING HOLD DOWN ANCHORS FOR METHOD ABW R602.10.6.2 METHOD PFH: PORTAL FRAME WITH HOLD-DOWNS |
| 177 | FIGURE 3.45 METHOD PFH PORTAL FRAME WITH HOLD DOWNS R602.10.6.3 METHOD PFG: PORTAL FRAME AT GARAGE DOOR OPENINGS IN SEISMIC DESIGN CATEGORIES A, B AND C |
| 178 | FIGURE 3.46 METHOD PFG PORTAL FRAME AT GARAGE DOOR OPENINGS IN SEISMIC DESIGN CATEGORIES |
| 179 | R602.10.6.4 METHOD CS-PF: CONTINUOUSLY SHEATHED PORTAL FRAME |
| 180 | FIGURE 3.47 METHOD CS-PF CONTINUOUSLY SHEATHED PORTAL FRAME PANEL CONSTRUCTION |
| 181 | TABLE 3.31 TENSION STRAP REQUIREMENTS FOR PONY WALLS |
| 182 | FIGURE 3.48 METHOD BV-WSP WALL BRACING FOR DWELLINGS WITH STON OR MASONRY R602.10.6.5 WALL BRACING FOR DWELLINGS WITH STONE AND MASONRY VENEER IN SEISMIC DESIGN CATEGORIES D0, D1 AND D2 |
| 184 | R602.10.6.5.1 LENGTH OF BRACING |
| 186 | TABLE 3.32 METHOD BV-WSP WALL BRACING REQUIREMENTS |
| 187 | TABLE 3.32 (Continued) METHOD BV-WSP WALL BRACING REQUIREMENTS |
| 188 | R602.10.7 ENDS OF BRACED WALL LINES WITH CONTINUOUS SHEATHING FIGURE 3.49 END CONDITION 1: NARROW BRACED WALL PANEL WITH CORNER RETURN PANEL |
| 189 | FIGURE 3.50 END CONDITION 2: NARROW BRACED WALL PANEL WITH 800LB HOLD DOWN FIGURE 3.51 END CONDITION 3: FULL LENGTH PANEL AT CORNER-NO RETURN CORNER OR HOLD DOWN REQUIRED |
| 190 | FIGURE 3.52 END CONDITION 4: FIRST BRACED WALL PANEL AWAY FROM CORNER REQUIRES D LENGTH PANEL ON EACH SIDE OF CORNER FIGURE 3.53 END CONDITION 5: FIRST BRACED WALL PANEL AWAY FROM CORNER REQUIRES 800LB HOLD DOWN IF SHEATHED CORNER PROVISIONS NOT MET |
| 191 | R602.10.8 BRACED WALL PANEL CONNECTIONS TABLE 3.33 ATTACHMENT OF BRACED WALL PANELS AT BOTTOM PLATE |
| 192 | FIGURE 3.54 BRACED WALL PANEL CONNECTION WHEN PERPENDICULAR TO FLOOR /CEILING FRAMING FIGURE 3.55 BRACED WALL PANEL CONNECTION WHEN PARALLEL TO FLOOR/CEILING FRAMING |
| 193 | R602.10.8.1 BRACED WAL PANEL CONNECTIONS FOR SEISMIC DESIGN CATEGORIES D0, D1 AND D2 TABLE 3.34 DOUBLE TOP PLATE SPLICE |
| 194 | FIGURE 3.56 TOP PLATE SPLICE FOR SDC DO, D1 AND D2 R602.10.8.2 CONNECTIONS TO ROOF FRAMING TABLE 3.35 SUMMARY OF BRACING CONNECTION AND BLOCKING REQUIREMENTS BETWEEN BRACED WALL PANELS AND ROOF FRAMING |
| 197 | FIGURE 3.57 BRACED WALL PANEL CONNECTION-LOW HEEL TRUSSES FIGURE 3.58 BRACED WALL PANEL CONNECTION SOFFIT BLOCKING |
| 198 | FIGURE 3.59 BRACED WALL PANEL CONNECTION VERTICAL PANELS |
| 199 | FIGURE 3.59 (Continued) BRACED WALL PANEL CONNECTION VERTICAL PANELS |
| 200 | R602.10.9 BRACED WALL PANEL SUPPORT FIGURE 3.60 BRACED WALL LINE CONNECTIONS OVER CANTILEVER FLOORS |
| 202 | TABLE 3.36 IRC REINFORCEMENT REQUIREMENTS |
| 203 | FIGURE 3.61 PLAIN CONCRETE FOOTINGS WITH MASONRY AND CONCRETE STEM WALLS IN SDC A, B AND C |
| 204 | FIGURE 3.62 REINFORCEMENT OF MASONRY OR CONCRETE STEM WALLS SUPPORTING BRACING ELEMENTS |
| 205 | R602.10.9.1 BRACED WALL PANEL SUPPORT FOR SEISMIC DESIGN CATEGORIES D0, D1 AND D2 R602.10.10 CRIPPLE WALL BRACING FIGURE 3.63 CRIPPLE WALL USED TO RAISE FLOOR ELEVATION |
| 206 | FIGURE 3.64 CRIPPLE WALL USED WITH A STEPPED FOUNDATION |
| 207 | R602.10.10.1 CRIPPLE WALL BRACING FOR SEISMIC DESIGN CATEGORIES D0 AND D1 AND TOWNHOUSES IN SEISMIC DESIGN CATEGORY C |
| 208 | FIGURE 3.65 CRIPPLE WALL BRACING IN SDC DO AND D1 R602.10.10.2 CRIPPLE WALL BRACING FOR SEISMIC DESIGN CATEGORY D2 |
| 209 | R602.10.10.3 REDESIGNATION OF CRIPPLE WALLS FIGURE 3.66A REDESIGNATING CRIPPLE WALLS |
| 210 | FIGURE 3.66B SDC A EXAMPLE FIGURE 3.66C SDC DO AND D1 EXAMPLE FIGURE 3.66D SDC D2 EXAMPLE |
| 211 | R602.11 WALL ANCHORAGE FOUNDATION REQUIREMENTS FOR BRACED WALL LINES |
| 212 | FIGURE 3.67 ACTIONS OF SOIL ON FOUNDATIONS CONTINUOUS FOOTINGS FIGURE 3.68 MINIMUM EXTERIOR WALL REQUIREMENTS |
| 213 | FIGURE 3.69 FOUNDATION WALL REQUIREMENTS FOR SDC D0, D1 AND D2 |
| 214 | R602.11.1 WALL ANCHORAGE FOR ALL BUILDINGS IN SEISMIC DESIGN CATEGORIES D0, D1 AND D2 AND TOWNHOUSES IN SEISMIC DESIGN CATEGORY C R602.11.2 STEPPED FOUNDATIONS IN SEISMIC DESIGN CATEGORIES D0, D1 AND D2 |
| 215 | FIGURE 3.70 REQUIREMENTS TO CONNECT SILL PLATES TO THE FOUNDATION FIGURE 3.71 SPLICE DETAIL FOR DOUBLE TOP PLATE OF CRIPPLE WALL WHEN BRACING REQUIREMENT IS MET BY DIRECT ATTACHMENT TO FOUNDATION FIGURE 3.72 EXAMPLE OF CONNECTION HARDWARE REQUIRED |
| 217 | FIGURE 3.73 CRIPPLE WALL PLACEMENT OVER STEPPED FOUNDATION FIGURE 3.74 CRIPPLE WALLS SHALL NOT BE PLACED ONE OVER THE OTHER |
| 219 | FIGURE 3.75 CRIPPLE WALL IN SDC D0, D1 AND D2 TREATED AS A STORY FIGURE 3.76 FOUNDATION IN SDC D0, D1 AND D2 NOT CONSIDERED TO BE A STEPPED FOOTING |
| 220 | R602.12 SIMPLIFIED WALL BRACING |
| 221 | R602.12.1 CIRCUMSCRIBED RECTANGLE |
| 222 | FIGURE 3.77 CIRCUMSCRIBED RECTANGLES FIGURE 3.78 SIMPLIFIED WALL BRACING DISTRIBUTE BRACING UNITS ON EXTERIOR WALLS AS SUITS DESIGNER |
| 223 | R602.12.2 SHEATHING MATERIALS R602.12.3 BRACING UNIT R602.12.3.1 MULTIPLE BRACING UNITS |
| 224 | FIGURE 3.79 COMPUTING NUMBER OF BRACING UNITS IN A WALL LINE R602.12.4 NUMBER OF BRACING UNITS |
| 225 | TABLE 3.37 DETERMINATION OF NUMBER BRACING UNITS REQUIRED AT EACH SIDE OF THE STRUCTURE |
| 226 | TABLE 3.37 (Continued) DETERMINATION OF NUMBER BRACING UNITS REQUIRED AT EACH SIDE OF THE STRUCTURE |
| 227 | R602.12.5 DISTRIBUTION OF BRACING UNITS FIGURE 3.80 SIMPLIFIED WALL BRACING DISTRIBUTION RULES R602.12.6 NARROW PANELS R602.12.6.1 METHOD CS-G |
| 228 | R602.12.6.2 METHOD CS-PF R602.12.6.3 METHODS ABW, PFH AND PFG R602.12.7 LATERAL SUPPORT R602.12.8 STEM WALLS |
| 229 | CHAPTER 4 WHOLE HOUSE CONSIDERATIONS |
| 230 | PUTTING IT ALL TOGETHER WHAT IS THE INTENT? WHOLE HOUSE EXAMPLES |
| 231 | TABLE 4.1 SUMMARY OF BRACING METHODS USED IN EXAMPLES TABLE 4.2 EXAMPLE INDEX |
| 232 | EXAMPLES USING SIMPLIFIED WALL BRACING METHOD EXAMPLE 4.1 SINGLE STORY HOUSE IN SDC A USING THE SIMPLIFIED METHOD |
| 233 | FIGURE 4.1 SINGLE STORY PLAN WITH METHOD WSP CONTINUOUS TABLE 4.3 NUMBER OF REQUIRED BRACING UNITS PER IRC R602.12.4 TABLE 4.4 SUFFICIENT TOTAL BRACING UNIT LENGTH |
| 234 | EXAMPLE 4.2 TWO-STORY HOUSE IN SDC B USING SIMPLIFIED WALL BRACING FIGURE 4.2 SECOND OF TWO STORIES WITH INTERMITTENT WOOD STRUCTURAL PANELS |
| 235 | FIGURE 4.3 FIRST OF TWO STORIES WITH INTERMITTENT WOOD STRUCTURAL PANELS TABLE 4.5 NUMBER OF REQUIRED BRACING UNITS PER IRC R602.12.4 TABLE 4.6 INSUFFICIENT TOTAL BRACING UNIT LENGTH |
| 236 | TABLE 4.6 (Continued) INSUFFICIENT TOTAL BRACING UNIT LENGTH FIGURE 4.4 SECOND OF TWO STORIES WITH CONTINUOUS WOOD STRUCTURAL PANELS |
| 237 | FIGURE 4.5 FIRST OF TWO STORIES WITH CONTINUOUS WOOD STRUCTURAL PANELS TABLE 4.7 CS-WSP METHOD |
| 238 | EXAMPLE 4.3 TWO-STORY HOUSE IN SDC C USING SIMPLIFIED WALL BRACING FIGURE 4.6 SECOND OF TWO STORIES WITH INTERMITTENT WOOD STRUCTURAL PANELS |
| 239 | FIGURE 4.7 FIRST OF TWO STORIES WITH CONTINUOUS WOOD STRUCTURAL PANELS TABLE 4.8 NUMBER OF REQUIRED BRACING UNITS PER IRC TABLE R602.12.4 TABLE 4.9 SUFFICIENT TOTAL BRACING UNIT LENGTH |
| 240 | EXAMPLES USING WALL BRACING METHOD EXAMPLE 4.4 SINGLE STORY HOUSE IN SDC A |
| 241 | FIGURE 4.8 SINGLE STORY PLAN WITH INTERMITTENT METHODS WSP AND GB BRACED WALL PANELS TABLE 4.10 SUFFICIENT TOTAL BRACING UNIT LENGTH TABLE 4.11 CHECK FOR SUFFICIENT BRACING LENGTH |
| 242 | EXAMPLE 4.5 TWO STORY HOUSE IN SDC C FIGURE 4.9 FIRST STORY PLAN WITH INTERMITTENT STRUCTURAL FIBERBOARD SHEATHING AND GYPSUM BOARD BRACED WALL PANELS |
| 243 | TABLE 4.12 CALCULATIONS FOR THE BOTTOM OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON THE ULTIMATE DESIGN WIND SPEED |
| 244 | FIGURE 4.10 TOP OF TWO STORY PLAN WITH INTERMITTENT METHOD SFB BRACED WALL PANELS TABLE 4.13 CALCULATIONS FOR THE BOTTOM OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON THE ULTIMATE DESIGN WIND SPEED TABLE 4.14 CALCULATIONS FOR THE TOP OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON THE ULTIMATE DESIGN WIND SPEED |
| 245 | EXAMPLE 4.6 TWO-STORY HOUSE IN SDC D2 FIGURE 4.11 FIRST STORY PLAN WITH INTERMITTENT WOOD STRUCTURAL PANEL AND GYPSUM BOARD (GB) BRACED WALL PANELS |
| 246 | TABLE 4.15 CALCULATIONS FOR THE FIRST OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND SEISMIC DESIGN CATEGORY |
| 247 | FIGURE 4.12 SECOND STORY PLAN WITH INTERMITTENT WOOD STRUCTURAL PANEL AND GYPSUM BOARD (GB) BRACED WALL PANELS IN TABLE 4.14 TABLE 4.16 CALCULATIONS FOR THE UPPER OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND SEISMIC DESIGN CATEGORY |
| 248 | TABLE 4.16 (Continued) CALCULATIONS FOR THE UPPER OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND SEISMIC DESIGN CATEGORY TABLE 4.17 CALCULATIONS FOR THE BOTTOM OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND AVERAGED BRACED WALL LINE SPACING |
| 249 | EXAMPLE 4.7 SINGLE-STORY HOUSE SDC A FIGURE 4.13 SINGLE STORY PLAN WITH INTERMITTENT METHODS WSP, GB ABW AND PFG BRACED WALL PANELS |
| 250 | TABLE 4.18 CALCULATIONS TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED |
| 251 | TABLE 4.19 CALCULATIONS FRO AVERAGE BRACED WALL LINE IN EXAMPLE 4.7 |
| 252 | TABLE 4.20 CALCULATIONS TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND AVERAGING BRACED WALL LINE SPACING |
| 253 | EXAMPLE 4.8 SINGLE-STORY HOUSE IN SDC B FIGURE 4.14 SINGLE STORY PLAN WITH INTERMITTENT METHODS HPS, GA DWB, PBS AND LIB |
| 254 | TABLE 4.21 CALCULATIONS TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED |
| 255 | EXAMPLE 4.9 TWO-STORY HOUSE IN SDC B |
| 256 | FIGURE 4.15 FIRST STORY PLAN WITH INTERMITTENT METHODS WOOD STRUCTURAL PANEL AND ALTERNATE BRACED WALL BRACED WALL PANELS TABLE 4.22 CALCULATIONS FOR THE FIRST OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED |
| 257 | TABLE 4.23 CALCULATIONS FOR THE FIRST OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND AVERAGED BRACED WALL LINE SPACING FIGURE 4.16 SECOND STORY PLAN WITH INTERMITTENT STRUCTURAL FIBERBOARD SHEATHING AND GYPSUM BOARD BRACED WALL PANELS |
| 258 | TABLE 4.24 CALCULATIONS FOR THE SECOND OF TWO STORIES TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED |
| 259 | EXAMPLE 4.10 SINGLE STORY HOUSE IN SDC D0 |
| 260 | FIGURE 4.17 SINGLE STORY PLAN WITH CONTINUOUSLY SHEATHED WOOD STRUCTURAL PANEL AND CONTINUOUSLY SHEATHED PORTAL FRAME BRACED WALL PANELS TABLE 4.24 CALCULATIONS TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND SEISMIC DESIGN CATEGORY |
| 261 | TABLE 4.24 (Continued) CALCULATIONS TO DETERMINE THE REQUIRED BRACING LENGTH BASED ON WIND SPEED AND SEISMIC DESIGN CATEGORY |
| 262 | EXAMPLE 4.11 T- AND L-SHAPED BUILDINGS FIGURE 4.18 DIVIDE BUILDING INTO SEPARATE SEGMENTS ANALYZE EACH SEPARATELY |
| 263 | FIGURE 4.20 BUILDING DIMENSIONS EXAMPLE |
| 264 | FIGURE 4.21 SEGMENT DIMENSIONS AND BRACING REQUIRED |
| 265 | FIGURE 4.22 SECTIONS REJOINED |
| 266 | BRACING IN HIGH SEISMIC REGIONS (SDC D0, D1 AND D2) |
| 268 | APPENDICES APPENDIX A: COLLECTORS WHAT IS A COLLECTOR AND WHAT DOES IT DO? |
| 269 | WHAT DOES A COLLECTOR LOOK LIKE AND HOW DO I DESIGN ONE? FIGURE A.1 FIRST BRACING PANEL SHOWN 14 FEET FROM CORNER CHOOSING A COLLECTOR |
| 270 | FIGURE A.2 SPLICE AT TOP PANEL REQUIRED TO TRANSFER LOAD ACROSS JOINT IN LOWER PLATE TO UPPER TOP PLATE TO UPPER TOP PLATE WHAT IS THE LENGTH OF THE TOP PLATE THAT MUST BE SPLICED? TABLE A.1 TOP PLATE SPLICE DESIGN TABLE |
| 272 | APPENDIX B: BRACING T- AND L-SHAPED BUILDINGS FIGURE B.1 DIVIDE STRUCTURE INTO RECTANGULAR ELEMENTS |
| 273 | FIGURE B.2 DETERMINE BRACING REQUIREMENTS PER THE IRC PRESCRIPTIVE PROVISIONS FOR EACH RECTANGULAR ELEMENT SEPARATELY FIGURE B.3 REJOIN RECTANGLES WITH BRACING PROVIDED RULES FOR REJOINING THE RECTANGLES AT THE COMMON SIDE |
| 274 | FIGURE B.4 NO WALL AT COMMON WALL LINE |
| 275 | APPENDIX C: INTERPOLATION |
| 276 | EQUATION 1 |
| 277 | APPENDIX D: AVERAGING BRACED WALL LINE SPACING FIGURE D.1 WITH BRACED WALL LINE DRAWN ON THE PLAN |
| 279 | FIGURE D.2 WITH BRACED WALL LINE DRAWN ON THE PLAN |
| 280 | APPENDIX E: COMPARISON OF THE LOCATION OF WALL BRACING INFORMATION IN THE FOUR EDITIONS OF THE IRC TABLE E.1 WALL BRACING INFORMATION IN THE 2018, 2015, 2012 AND 2009 EDITIONS OF THE IRC |
| 281 | TABLE E.1 (Continued) WALL BRACING INFORMATION IN THE 2018, 2015, 2012 AND 2009 EDITIONS OF THE IRC |
| 282 | APPENDIX F: MIXING BRACING METHODS TABLE F.1 MIXING BRACING METHODS PER IRC SECTION R602.10.4.1 |
| 283 | BIBLIOGRAPHY |
| 286 | APA WALL BRACING CALCULATOR |
| 288 | 2018 IRC BRACING METHODS OVERVIEW |
| 291 | A GUIDE TO THE 2018 IRC® WOOD WALL BRACING PROVISIONS BACK COVER WITH DESCRIPTION AND TOPICS COVERED |
