1911A Existing Concrete Structures — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-09-25 · 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 Building Code (Title 24, Part 2) § 1911A · Effective January 1, 2026 · Official source: Building Standards Commission
1911A.1 Existing concrete structures.¶
The structural use of existing concrete with a core strength less than 1,500 psi (10.3MPa) is not permitted in rehabilitation work.
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CONCRETE
For existing concrete structures, sufficient cores shall be taken at representative locations throughout the structure, as designated by the architect or structural engineer, so that knowledge will be had of the in-place strength of the concrete. At least three cores shall be taken from each building for each 4,000 square feet (372 m [2] ) of floor area, or fraction thereof. Cores shall be at least 4 inches (102 mm) in diameter. Cores as small as 2.75 inches (70 mm) in diameter may be allowed by the enforcement agency when reinforcement is closely spaced and the coarse aggregate does not exceed 3/4 inch (19 mm).
1911A.2 Crack repair by epoxy injection.¶
Crack repair of concrete and masonry member by epoxy injection shall conform to all require- ments of ACI 548.15.
1911A.3 Concrete strengthening by externally bonded fiber reinforced polymer (FRP).¶
Design and construction of externally bonded FRP systems for strengthening concrete structures shall be in accordance with ACI 440.2R.
Exceptions: 1. Near-Surface Mounted (NSM) FRP bars shall not be permitted. 2. Strengthening of shear walls and diaphragms (including chords and collectors) shall be considered as an alternative system.
Design capacities, reliability, serviceability of FRP materials shall be permitted to be established in accorda nce with ICC-ES AC 125. Minimum inspection requirements of FRP composite systems shall be in accordance with ICC-ES AC 178.
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CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE
CHAPTER 20 – ALUMINUM
(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 | DSA | OSHPD | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopting agency | BSC | BSC- CG |
SFM | 1 | 2 | 1/AC | AC | SS | SS/CC | 1 | 1R | 2 | 3 | 4 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Adopt entire chapter | X | X | X | X | X | |||||||||||||||||||
| Adopt entire chapter as amended (amended sections listed below) |
X | X | X | X | X | X | X | |||||||||||||||||
| Adopt only those sections that are listed below |
||||||||||||||||||||||||
| Chapter / Section | ||||||||||||||||||||||||
| 2001.1.1 | X | X | X | X | X | X | X | |||||||||||||||||
| 2001.1.2 | X | X | X | X | X | X | X | |||||||||||||||||
| 2001.1.3 | X | X | X | X | X | X | X | |||||||||||||||||
| 2001.1.4 | X | X | ||||||||||||||||||||||
| 2002.1 | X | X | X | X | X | X | X | |||||||||||||||||
| 2003 | X | X | X | X | X | X | 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.
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