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Earlier editions: 20222019

Appendix A — GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING BUILDINGS

A114 Walls of Unburned Clay, Adobe or Stone Masonry — 2025 California Existing Building Code

California Existing Building Code (Title 24, Part 10) · 2025 edition · updated 2026-10-19 · California

CBSC: official editions, supplements and errata

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

Cite as: 2025 California Existing Building Code (Title 24, Part 10) § A114 · Effective January 1, 2026 · Official source: Building Standards Commission

A114.1 General.

[BS] A114.1 General. Walls of unburned clay, adobe or stone masonry construction shall conform to the following:

  1. Walls of unburned clay, adobe or stone masonry shall not exceed a height- or length-to-thickness ratio specified in Table A114.1.

  2. Adobe shall be allowed a maximum value of 9 pounds per square inch (62.1 kPa) for shear unless higher values are justified by test.

  3. Mortar for repointing may be of the same soil composition and stabilization as the brick, in lieu of cement mortar.

[BS]TABLE A114.1—MAXIMUM HEIGHT-TO-THICKNESS RATIO FOR ADOBE OR STONE WALLS
_SD_1 _SD_1 _SD_1
0.13g ≤****_SD_1 < 0.25g 0.25g ≤****_SD_1 < 0.4g _SD_1 ≥ 0.4g
One-story buildings 12 10 8
Two-story buildings
First story 14 11 9
Second story 12 10 8

APPENDIX A

CHAPTER A2 – EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAGMS

(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

Adopting Agency BSC BSC-CG SFM HCD 1 HCD 2 HCD 1/AC DSA AC DSA SS DSA SS/CC OSHPD 1 OSHPD 1R OSHPD 2 OSHPD 3 OSHPD 4 OSHPD 5 OSHPD 6 BSCC DPH AGR DWR CEC CA SL SLC
Adopt Entire Chapter
Adopt Entire Chapter as amended (amended sections listed below) X
Adopt only those sections that are listed below
Chapter / Section
A202.1 X

The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

CHAPTER A2

EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAGMS

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