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Chapter 8 — ROOF-CEILING CONSTRUCTION

California Residential Code (Title 24, Part 2.5) · 2019 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user.

See Chapter 1 for state agency authority and building applications.)

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R806.2 X
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Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

442 2019 CALIFORNIA RESIDENTIAL CODE Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

CHAPTER 8

ROOF-CEILING CONSTRUCTION

User note:

About this chapter: Chapter 8 addresses the design and construction of roof-ceiling systems. This chapter contains two roof-ceiling framing systems: wood framing and cold-formed steel framing. Allowable span tables are provided to simplify the selection of rafter and ceiling joist size for wood roof framing and cold-formed steel framing. Chapter 8 also provides requirements for the application of ceiling finishes, the proper ventilation of concealed spaces in roofs (for example, enclosed attics and rafter spaces), unvented attic assemblies and attic access.

R802.11 Roof tie-down.

R802.11.1 Uplift resistance. Roof assemblies shall have uplift resistance in accordance with Sections R802.11.1.1 and R802.11.1.2.

Where the uplift force does not exceed 200 pounds (90.8 kg), rafters and trusses spaced not more than 24 inches (610 mm) on center shall be permitted to be

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

ROOF-CEILING CONSTRUCTION

TABLE R802.11 RAFTER OR TRUSS UPLIFT CONNECTION FORCES FROM WIND (ASD) (POUNDS PER CONNECTION) a, b, c, d, e, f, g, h

RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 EXPOSURE B
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph)
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 110 110 115 115 120 120 130 130 140 140
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12
12 o.c. 12 48 43 59 53 70 64 95 88 122 113
12 o.c. 18 59 52 74 66 89 81 122 112 157 146
12 o.c. 24 71 62 89 79 108 98 149 137 192 178
12 o.c. 28 79 69 99 88 121 109 167 153 216 200
12 o.c. 32 86 75 109 97 134 120 185 170 240 222
12 o.c. 36 94 82 120 106 146 132 203 186 264 244
12 o.c. 42 106 92 135 120 166 149 230 211 300 278
12 o.c. 48 118 102 151 134 185 166 258 236 336 311
16 o.c. 12 64 57 78 70 93 85 126 117 162 150
16 o.c. 18 78 69 98 88 118 108 162 149 209 194
16 o.c. 24 94 82 118 105 144 130 198 182 255 237
16 o.c. 28 105 92 132 117 161 145 222 203 287 266
16 o.c. 32 114 100 145 129 178 160 246 226 319 295
16 o.c. 36 125 109 160 141 194 176 270 247 351 325
16 o.c. 42 141 122 180 160 221 198 306 281 399 370
16 o.c. 48 157 136 201 178 246 221 343 314 447 414
24 o.c. 12 96 86 118 106 140 128 190 176 244 226
24 o.c. 18 118 104 148 132 178 162 244 224 314 292
24 o.c. 24 142 124 178 158 216 196 298 274 384 356
24 o.c. 28 158 138 198 176 242 218 334 306 432 400
24 o.c. 32 172 150 218 194 268 240 370 340 480 444
24 o.c. 36 188 164 240 212 292 264 406 372 528 488
24 o.c. 42 212 184 270 240 332 298 460 422 600 556
24 o.c. 48 236 204 302 268 370 332 516 472 672 622

(continued)

470 2019 CALIFORNIA RESIDENTIAL CODE

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

ROOF-CEILING CONSTRUCTION

TABLE R802.11—continued RAFTER OR TRUSS UPLIFT CONNECTION FORCES FROM WIND (ASD) (POUNDS PER CONNECTION) a, b, c, d, e, f, g, h

RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 EXPOSURE C
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph) Ultimate Design Wind SpeedVULT (mph)
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 110 110 115 115 120 120 130 130 140 140
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
 Roof Pitch
RAFTER
OR TRUSS
SPACING		 ROOF
SPAN
(feet)		 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12 < 5:12 5:12
12 o.c. 12 95 88 110 102 126 118 161 151 198 186
12 o.c. 18 121 111 141 131 163 151 208 195 257 242
12 o.c. 24 148 136 173 160 200 185 256 239 317 298
12 o.c. 28 166 152 195 179 225 208 289 269 358 335
12 o.c. 32 184 168 216 199 249 231 321 299 398 373
12 o.c. 36 202 185 237 219 274 254 353 329 438 411
12 o.c. 42 229 210 269 248 312 289 402 375 499 468
12 o.c. 48 256 234 302 278 349 323 450 420 560 524
16 o.c. 12 126 117 146 136 168 157 214 201 263 247
16 o.c. 18 161 148 188 174 217 201 277 259 342 322
16 o.c. 24 197 181 230 213 266 246 340 318 422 396
16 o.c. 28 221 202 259 238 299 277 384 358 476 446
16 o.c. 32 245 223 287 265 331 307 427 398 529 496
16 o.c. 36 269 246 315 291 364 338 469 438 583 547
16 o.c. 42 305 279 358 330 415 384 535 499 664 622
16 o.c. 48 340 311 402 370 464 430 599 559 745 697
24 o.c. 12 190 176 220 204 252 236 322 302 396 372
24 o.c. 18 242 222 282 262 326 302 416 390 514 484
24 o.c. 24 296 272 346 320 400 370 512 478 634 596
24 o.c. 28 332 304 390 358 450 416 578 538 716 670
24 o.c. 32 368 336 432 398 498 462 642 598 796 746
24 o.c. 36 404 370 474 438 548 508 706 658 876 822
24 o.c. 42 458 420 538 496 624 578 804 750 998 936
24 o.c. 48 512 468 604 556 698 646 900 840 1120 1048

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound = 0.454 kg, 1 pound per square foot = 47.9 N/m 2,

1 pound per linear foot = 14.6 N/m. a. The uplift connection forces are based on a maximum 33-foot mean roof height and Wind Exposure Category B or C. For Exposure D, the uplift connection

force shall be selected from the Exposure C portion of the table using the next highest tabulated ultimate design wind speed. The adjustment coefficients in Table R301.2(3) shall not be used to multiply the tabulated forces for Exposures C and D or for other mean roof heights. b. The uplift connection forces include an allowance for roof and ceiling assembly dead load of 15 psf. c. The tabulated uplift connection forces are limited to a maximum roof overhang of 24 inches. d. The tabulated uplift connection forces shall be permitted to be multiplied by 0.75 for connections not located within 8 feet of building corners. e. For buildings with hip roofs with 5:12 and greater pitch, the tabulated uplift connection forces shall be permitted to be multiplied by 0.70. This reduction shall

not be combined with any other reduction in tabulated forces. f. For wall-to-wall and wall-to-foundation connections, the uplift connection force shall be permitted to be reduced by 60 plf for each full wall above. g. Linear interpolation between tabulated roof spans and wind speeds shall be permitted. h. The tabulated forces for a 12-inch on-center spacing shall be permitted to be used to determine the uplift load in pounds per linear foot.

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

ROOF-CEILING CONSTRUCTION

R803.2.1.1 Exposure durability. Wood structural panels, when designed to be permanently exposed in outdoor applications, shall be of an exterior exposure durability. Wood structural panel roof sheathing exposed to the underside shall be permitted to be of interior type bonded with exterior glue, identified as Exposure 1.

R803.2.1.2 Fire-retardant-treated plywood. The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated plywood will be subjected, the type of treatment and redrying process. The fire-retardant-treated plywood shall be graded by an approved agency.

R803.2.2 Allowable spans. The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(1), or APA E30.

R803.2.3 Installation. Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), APA E30 for wood roof framing or with Table R804.3 for coldformed steel roof framing. Wood structural panel roof sheathing in accordance with Table R503.2.1.1(1) shall not cantilever more than 9 inches (229 mm) beyond the gable endwall unless supported by gable overhang framing.

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▸Contents — California Residential Code (Title 24, Part 2.5)
California Residential Code (Title 24, Part 2.5)
  1. Chapter 2 — DEFINITIONS AND ABBREVIATIONS
  2. Chapter 1 — SCOPE AND APPLICATION
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. ▸Chapter 8 — ROOF-CEILING CONSTRUCTION
    Overview
    1. Section R801
    2. Section R802
    3. Section R803
    4. Section R804
    5. Section R805
    6. Section R806
    7. Section R807
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix F — RADON CONTROL METHODS
  13. Appendix H — PATIO COVERS
  14. Appendix I — PRIVATE SEWAGE DISPOSAL
  15. Appendix J — EXISTING BUILDINGS AND STRUCTURES
  16. Appendix K — SOUND TRANSMISSION
  17. Appendix L — PERMIT FEES
  18. Appendix O — AUTOMATIC VEHICULAR GATES
  19. Appendix Q — TINY HOUSES
  20. Appendix R — LIGHT STRAW-CLAY CONSTRUCTION
  21. Appendix S — STRAWBALE CONSTRUCTION
  22. Appendix T — SOLAR-READY PROVISIONS—DETACHED ONE- AND
  23. Appendix V — SWIMMING POOL SAFETY ACT
  24. Appendix W — AREAS PROTECTED BY THE FACILITIES
  25. Appendix X — EMERGENCY HOUSING

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