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Appendix A — GUIDELINES FOR

California Existing Building Code (Title 24, Part 10) · 2019 edition · updated 2026-09-10 · California

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

THE SEISMIC RETROFIT OF EXISTING BUILDINGS . . . . . . . 143

CHAPTER A1 SEISMIC STRENGTHENING

PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS . . . . . . . . . . . . . . . . . . . . 143

Section

A100 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

A101 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

A102 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

A103 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

A104 Symbols and Notations . . . . . . . . . . . . . . . . . . . . . 144

A105 General Requirements . . . . . . . . . . . . . . . . . . . . . . 145

A106 Materials Requirements. . . . . . . . . . . . . . . . . . . . . 146

A107 Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

A108 Design Strengths . . . . . . . . . . . . . . . . . . . . . . . . . . 148

A109 Analysis and Design Procedure. . . . . . . . . . . . . . . 149

A110 General Procedure. . . . . . . . . . . . . . . . . . . . . . . . . 150

A111 Special Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 151

A112 Analysis and Design . . . . . . . . . . . . . . . . . . . . . . . 153

TABLE OF CONTENTS

A113 Detailed Building System
Design Requirements. . . . . . . . . . . . . . . . . . . . . 154
A114 Walls of Unburned Clay,
Adobe or Stone Masonry . . . . . . . . . . . . . . . . . . 155

CHAPTER A2 EARTHQUAKE HAZARD

REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAGMS. . . . . . . . . . . . . . . . . . 161

Section

A201 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
A202 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
A203 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
A204 Symbols and Notations . . . . . . . . . . . . . . . . . . . . . 161
A205 General Requirements. . . . . . . . . . . . . . . . . . . . . . 161
A206 Analysis and Design . . . . . . . . . . . . . . . . . . . . . . . 162
A207 Materials of Construction . . . . . . . . . . . . . . . . . . . 163

CHAPTER A3 PRESCRIPTIVE PROVISIONS

FOR SEISMIC STRENGTHENING OF CRIPPLE WALLS AND SILL PLATE ANCHORAGE OF LIGHT, WOOD-FRAME RESIDENTIAL BUILDINGS . . . . . . 167

Section

A301 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
A302 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
A303 Structural Weaknesses . . . . . . . . . . . . . . . . . . . . . 168
A304 Strengthening Requirements. . . . . . . . . . . . . . . . . 168

CHAPTER A4 EARTHQUAKE RISK

REDUCTION IN WOOD-FRAME RESIDENTIAL BUILDINGS WITH SOFT, WEAK OR OPEN FRONT WALLS. . . . . . . . . . . 187

Section

A401 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
A402 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
A403 Analysis and Design . . . . . . . . . . . . . . . . . . . . . . . 187
A404 Prescriptive Measures for Weak Story . . . . . . . . . 189
A405 Materials of Construction . . . . . . . . . . . . . . . . . . . 189
A406 Information Required to Be on the Plans . . . . . . . 190
A407 Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

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

TABLE OF CONTENTS

CHAPTER A5 REFERENCED STANDARDS . . . . . 191

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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
  5. Chapter 1 — SCOPE AND ADMINISTRATION
  6. Chapter 3 — PROVISIONS FOR ALL COMPLIANCE METHODS
  7. Chapter 4 — REPAIRS
  8. Chapter 5 — PRESCRIPTIVE COMPLIANCE METHOD
  9. Chapter 6 — CLASSIFICATION OF WORK
  10. Chapter 7 — ALTERATIONS - LEVEL 1
  11. Chapter 8 — ALTERATIONS - LEVEL 2
  12. Chapter 9 — ALTERATIONS - LEVEL 3
  13. Chapter 10 — CHANGE OF OCCUPANCY
  14. Chapter 11 — ADDITIONS
  15. Chapter 12 — HISTORIC BUILDINGS
  16. Chapter 13 — PERFORMANCE COMPLIANCE METHODS
  17. Chapter 14 — RELOCATED OR MOVED BUILDINGS
  18. Chapter 15 — CONSTRUCTION SAFEGUARDS
  19. Chapter 16 — REFERENCED STANDARDS

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