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Chapter 16 — REFERENCED STANDARDS

Section C202

California Existing Building Code (Title 24, Part 10) · 2022 edition · updated 2026-09-10 · California

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

ROOF DECK ATTACHMENT FOR WOOD ROOFS

[BS] C202.1 Roof decking attachment for one- and two- family dwellings. For one- and two-family dwellings, fastening shall be in accordance with Section C202.1.1 or C202.1.2 as appropriate for the existing construction. The diameter of 8d nails shall be not less than 0.131 inch (3 mm) and the length shall be not less than 2 1 /4 inches (57 mm) to qualify for the provisions of this section for existing nails regardless of head shape or head diameter.

[BS] C202.1.1 Sawn lumber or wood plank roofs. Roof decking consisting of sawn lumber or wood planks up to 12 inches (30 cm) wide and secured with not fewer than two nails (minimum size 8d) to each roof framing member it crosses shall be deemed to be sufficiently connected. Sawn lumber or wood plank decking secured with smaller fasteners than 8d nails or with fewer than two nails (minimum size 8d) to each framing member it crosses shall be deemed sufficiently connected if fasteners are added such that two clipped head, round head or ring shank nails (minimum size 8d) are in place on each framing member the nail crosses.

[BS] C202.1.2 Wood structural panel roofs For roof decking consisting of wood structural panels, fasteners and spacings required in Table C202.1.2 shall be deemed to comply with the requirements of Section 706.3.

Supplemental fasteners as required by Table C202.1.2 shall be 8d ring shank nails with round heads and the following minimum dimensions:

  1. 0.113-inch-nominal (3 mm) shank diameter.
  2. Ring diameter not less than 0.012 inch (0.3 mm) greater than shank diameter.
  3. 16 to 20 rings per inch.
  4. A minimum 0.280-inch (7 mm) full round head diameter.
  5. Ring shank to extend not less than 1 1 /2 inches (38 mm) from the tip of the nail.
  6. Minimum 2 1 /4-inch (57 mm) nail length.

Copyright © 2022 by, or licensed to, International Code Council, Inc. (ALL RIGHTS RESERVED); licensed to California Building Standards Commission pursuant to License Agreement. No further reproductions is authorized. 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.

APPENDIX C—GUIDELINES FOR THE WIND RETROFIT OF EXISTING BUILDINGS

[BS] TABLE C202.1.2 SUPPLEMENT FASTENERS AT PANEL EDGES AND INTERMEDIATE FRAMING

EXISTING FASTENERS EXISTING FASTENER
SPACING (EDGE OR
INTERMEDIATE
SUPPORTS)		 MAXIMUM SUPPLEMENTAL
FASTENER SPACING FOR
130 MPH < V ≤ 140 MPH
ult		 MAXIMUM SUPPLEMENTAL
FASTENER SPACING FOR
INTERIOR ZONEc LOCATIONS
FOR MPH V > 140 MPH AND
ult
EDGE ZONES NOT COVERED
BY THE COLUMN TO THE
RIGHT		 EDGE ZONEd FOR V > 160
ult
MPH AND EXPOSURE C, OR
V > 180 MPH AND
ult
EXPOSURE B
Staples or 6d Any 6″ o.c.b 6″ o.c.b 4″ o.c.b at panel edges and
4″ o.c.b at intermediate sup-
ports
8d clipped head or round head
smooth shank		 6″ o.c. or less None necessary None necessary along
edges of panels but 6″ o.c.b
at intermediate supports of
panel		 4″ o.c.a at panel edges and
4″ o.c.a at intermediate sup-
ports
8d clipped head or round head
ring shank		 6″ o.c. or less None necessary None necessary 4″ o.c.a at panel edges and
4″ o.c.a at intermediate sup-
ports
8d clipped head or round head
smooth shank		 Greater than 6″ o.c. 6″ o.c.a 6″ o.c.a along panel edges
and 6″ o.c.b at intermediate
supports of panel		 4″ o.c.a at panel edges and
4″ o.c.a at intermediate sup-
ports
8d clipped head or round head
ring shank		 Greater than 6″ o.c. 6″ o.c.a 6″ o.c.a 4″ o.c.a at panel edges and
4″ o.c.a at intermediate sup-
ports

For SI: 1 inch = 25.4 mm; 1 foot = 304.8 mm; 1 mile per hour = 0.447 m/s. a. Maximum spacing determined based on existing fasteners and supplemental fasteners. b. Maximum spacing determined based on supplemental fasteners only. c. Interior zone = sheathing that is not located within 4 feet of the perimeter edge of the roof or within 4 feet of each side of a ridge. d. Edge zone = sheathing that is located within 4 feet of the perimeter edge of the roof and within 4 feet of each side of a ridge.

APPENDIX C-26 2022 CALIFORNIA EXISTING BUILDING CODE

Copyright © 2022 by, or licensed to, International Code Council, Inc. (ALL RIGHTS RESERVED); licensed to California Building Standards Commission pursuant to License Agreement. No further reproductions is authorized. 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.

CHAPTER C3

REFERENCED STANDARDS

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▸Contents — California Existing Building Code (Title 24, Part 10)
California Existing Building Code (Title 24, Part 10)
  1. Chapter 2 — DEFINITIONS
  2. Appendix A — GUIDELINES FOR
  3. Appendix B — SUPPLEMENTARY
  4. Appendix C — GUIDELINES FOR THE WIND
  5. Appendix D — BOARD OF
  6. Chapter 1 — SCOPE AND ADMINISTRATION
  7. Chapter 3 — PROVISIONS FOR ALL COMPLIANCE METHODS
  8. Chapter 4 — REPAIRS
  9. Chapter 5 — PRESCRIPTIVE COMPLIANCE METHOD
  10. Chapter 6 — CLASSIFICATION OF WORK
  11. Chapter 7 — ALTERATIONS—LEVEL 1
  12. Chapter 8 — ALTERATIONS—LEVEL 2
  13. Chapter 9 — ALTERATIONS—LEVEL 3
  14. Chapter 10 — CHANGE OF OCCUPANCY
  15. Chapter 11 — ADDITIONS
  16. Chapter 12 — HISTORIC BUILDINGS
  17. Chapter 13 — PERFORMANCE COMPLIANCE METHODS
  18. Chapter 14 — RELOCATED OR MOVED BUILDINGS
  19. Chapter 15 — CONSTRUCTION SAFEGUARDS
  20. ▸Chapter 16 — REFERENCED STANDARDS
    Overview
    1. Section A100
    2. Section A101
    3. Section A102
    4. Section A103
    5. Section A104
    6. Section A105
    7. Section A106
    8. Section A107
    9. Section A108
    10. Section A109
    11. Section A110
    12. Section A111
    13. Section A112
    14. Section A113
    15. Section A114
    16. Section A201
    17. Section A202
    18. Section A203
    19. Section A204
    20. Section A205
    21. Section A206
    22. Section A207
    23. Section A301
    24. Section A302
    25. Section A303
    26. Section A304
    27. Section A401
    28. Section A403
    29. Section A402
    30. Section A404
    31. Section A405
    32. Section A406
    33. Section A407
    34. Section A501
    35. Section B101
    36. Section B102
    37. Section B103
    38. Section B104
    39. Section C101
    40. Section C102
    41. Section C103
    42. Section C104
    43. Section C201
    44. Section C202
    45. Section C301
    46. Section D101

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