CEBC · California Existing Building Code
Where is ACI 562 (assessment/repair of concrete) referenced?
If you're repairing structural concrete in an existing California building, **§ 405.1.1** permits using **ACI 562 Section 1.7** (ACI 562—21 is the edition listed in Chapter 16); however, if the building has disproportionate or substantial damage under **§ 405.2.2**, **§ 405.2.3**, or **§ 405.2.4.1**, the CEBC requires evaluation and may direct you to follow **Section 304.3** instead.
Last reviewed: July 6, 2026
What the code requires
Repair of structural concrete in the California Existing Building Code is explicitly allowed to follow ACI 562 Section 1.7 as an alternative compliance path. This allowance is the rule in § 405.1.1; where certain damage conditions exist, the code instead requires compliance with Section 304.3 (see § 405.1.1).
If you're repairing structural concrete, you may use ACI 562 (Section 1.7) unless the repair is covered by the specific damage/retrofit rules in Sections 405.2.2, 405.2.3 or 405.2.4.1, which require following Section 304.3 instead.
Requirements in detail
Short plain-English rule
- For ordinary repairs of structural concrete, the CEBC permits the repair work to comply with ACI 562 Section 1.7. § 405.1.1 is the controlling code reference.
- The allowance is constrained: where the building is subject to the special repair/retrofit procedures identified in § 405.2.2, § 405.2.3 or § 405.2.4.1, the work must comply with Section 304.3 rather than ACI 562.
Decision table — when ACI 562 is available
| Decision dimension | Allowed value / threshold | What that means in practice | Code Reference |
|---|---|---|---|
| Material / element | Structural concrete | Repairs to structural concrete may follow ACI 562 Section 1.7 | § 405.1.1 |
| Compliance path | ACI 562 Section 1.7 permitted | ACI 562—21 is the listed standard associated with this allowance | Chapter 16 referenced standards; ACI 562—21 → § 405.1.1 |
| When ACI 562 is NOT the path | If Sections 405.2.2, 405.2.3, or 405.2.4.1 apply | These sections (disproportionate earthquake damage, substantial structural damage, certain gravity/lateral cases) require following Section 304.3 instead | § 405.1.1; see § 405.2.2, § 405.2.3, § 405.2.4.1 |
| Routine maintenance exception | Routine maintenance / ordinary repairs exempt from permit | Routine maintenance is not subject to the repair requirements in Chapter 4 (see exception to § 405.1) | § 405.1 (exception) |
Notes:
- The CEBC’s Chapter 16 explicitly lists ACI 562—21: Assessment, Repair, and Rehabilitation of Existing Concrete Structures—Code Requirements with the code cross-reference 405.1.1, confirming the edition and linkage.
- The CEBC text in § 405.1.1 states the permission to comply with ACI 562 Section 1.7, not the entirety of ACI 562; the code pinpoints Section 1.7 as the relevant portion.
Exceptions & special cases
- Damage requiring other procedures — If the building has disproportionate earthquake damage or substantial structural damage to vertical elements of the lateral force‑resisting system, the CEBC directs evaluation and possible retrofit steps (Sections 405.2.2 and 405.2.3) that result in requiring compliance with Section 304.3 instead of ACI 562. In short: ACI 562 is not the automatic path in those cases.
- Substantial damage to gravity elements — When gravity load‑carrying components sustain substantial damage primarily from wind or seismic effects, the building must be evaluated under § 405.2.4.1, and if required, comply with Section 304.3. That overrides the ACI 562 allowance.
- Routine maintenance and ordinary repairs are not subject to the Chapter 4 repair requirements (they are excluded by the exception to § 405.1) and therefore are outside the ACI 562 decision path in CEBC.
Common mistakes
- Assuming ACI 562 is always permitted for any concrete work on an existing building. The CEBC only permits ACI 562 Section 1.7 specifically for repairs of structural concrete — and not when the building falls under the special damaged‑building provisions that feed to Section 304.3. See § 405.1.1.
- Citing the wrong edition: the CEBC’s referenced standard is ACI 562—21 in Chapter 16; verify the edition in the adopted standards list rather than relying on a different year.
- Treating ACI 562 as a substitute for the evaluation steps required by § 405.2.3 (substantial structural damage). Those evaluation/retrofit requirements may lead to compliance with Section 304.3 instead.
Worked example — applying the rule with numbers
Scenario: A 4‑story concrete building has a ground‑floor column with localized spalling. The spalled area exposes reinforcement over a roughly 12 in. × 18 in. patch on one face of a column that is 16 in. × 16 in. in cross section. No other columns or lateral system components show damage; the building’s overall lateral system remains intact and there was no disproportionate earthquake damage.
How the CEBC applies:
- This is a repair to a structural concrete element (a column). Under § 405.1.1, the owner/designer is permitted to perform the repair to comply with ACI 562 Section 1.7 (i.e., use ACI 562 repair procedures) because the damage described is a localized repair and does not trigger the substantial‑damage evaluation provisions. § 405.1.1
- Caveat: if the registered design professional’s evaluation finds the column damage is part of substantial structural damage to the lateral system (or the event that caused the damage meets “disproportionate earthquake damage”), then the repair route would instead require following Section 304.3 per CEBC (see § 405.1.1 and § 405.2.3).
Put simply: in this numeric scenario (single localized patch, no system‑level damage), you may use ACI 562 Section 1.7 procedures per § 405.1.1; escalate to the evaluation/retrofit path only if the damage meets the definitions in § 405.2.2/405.2.3/405.2.4.1.
Related provisions
- § 405.1 — General structural repairs and the routine‑maintenance exception.
- § 405.1.1 — Structural concrete allowance to use ACI 562 Section 1.7 (controlling section).
- § 405.2.2 — Disproportionate earthquake damage (may require Section 304.3).
- § 405.2.3 — Substantial structural damage to vertical elements; evaluation and possible retrofit to Section 304.3.
- § 405.2.4.1 — Lateral force‑resisting elements and interaction with substantial gravity‑component damage.
- Chapter 16 referenced standards — lists ACI 562—21 as the standard referenced to § 405.1.1 (confirming edition).
Code references
Grounded in the retrieved California Existing Building Code — click a citation to read the verbatim passage:
CEBC § 1.11. High relevance — show source text
41—2023|X|||X|X|||X|X|X|X|X||X|X|||||||||| |ASTM A615—15 22||||||||||X||||||||||||||| |ICC A117.1—2017||||†|†|†||||||||||||||||||| |ICC CBC—25||||||||||X||||||||||||||| |NFPA 72—24|||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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16 REFERENCED STANDARDS
User notes:
About this chapter: This code contains numerous references to standards that are used to regulate materials and methods of construction. Chapter 16 contains a comprehensive list of all standards that are referenced in the code, including the appendices. The standards are part of the code to the extent of the reference to the standard. Compliance with the referenced standard is necessary for compliance with this code. By providing specifically adopted standards, the construction and installation requirements necessary for compliance with the code can be readily determined. The basis for code compliance is, therefore, established and available on an equal basis to the building code official, contractor, designer and owner.
This chapter lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section 102.4 , or California Administration Division 1, as applicable. [OSHPD 1] Reference to other chapters. In addition to the code sections referenced, the standards listed in this chapter are applicable to the respective code sections in Chapters 3A, 4A and 5A.
ACI American Concrete Institute, 38800 Country Club Drive, Farmington Hills, MI 48331-3439
562—21: Assessment, Repair, and Rehabilitation of Existing Concrete Structures—Code Requirements
405.1.1
ASCE/SEI American Society of Civil Engineers Structural Engineering Institute, 1801 Alexander Bell Drive, Reston, VA 20191-4400
7—1988: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1993: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1995: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1998: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2002: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2005: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2010: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
CEBC § 48331-3439 High relevance — show source text
ACI American Concrete Institute, 38800 Country Club Drive, Farmington Hills, MI 48331-3439
562—21: Assessment, Repair, and Rehabilitation of Existing Concrete Structures—Code Requirements
405.1.1
ASCE/SEI American Society of Civil Engineers Structural Engineering Institute, 1801 Alexander Bell Drive, Reston, VA 20191-4400
7—1988: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1993: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1995: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—1998: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2002: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2005: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
503.12, 706.3.2
7—2010: Minimum Design Loads and Associated Criteria for Buildings and Other Structures
304A.3.5.6, 304A.3.5.11, 503.12, 501A.3.1, 706.3.2
7—2016 with Supplement 1: Minimum Design Loads and Associated Criteria for Buildings and Other Structures [OSHPD 1] with Supplement 3
503.12, 706.3.2
7—2022: Minimum Design Loads and Associated Criteria for Buildings and Other Structures [OSHPD 1, 1R, 2, 4 and 5, DSS-SS, DSA- SS/CC] with Supplement 1
304.2, 304.3.1, 304A.2, 304A.3.6.4, 304A.3.6.6, 503.4, 503.12, 503.13, 501A.3, 502A.5, 503A.4, 503A.13, 706.3.2, 805.3, 805.4
41— 2013 : [OSHPD 1] Seismic Evaluation and Retrofit of Existing Buildings 304.3.1, Table 304.3.1, 304.3.2, Table 304.3.2, 503.5, 503.11, 506.5.3, 906.2, 906.3, 1006.3
41—2017: Seismic Evaluation and Retrofit of Existing Buildings 304.3.1, Table 304.3.1, 304.3.2, Table 304.3.2, 503.5, 503.11, 506.5.3, 906.2, 906.3, 1006.3
CEBC § 105.2 High relevance — show source text
401 A .2 Compliance. The work shall not make the building less complying than it was before the repair was undertaken. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to requirements for alterations.
401 A .3 Flood hazard areas. In flood hazard areas, repairs that constitute substantial improvement shall require that the building comply with Section 1612 A of the California Building Code .
SECTION 402 A —BUILDING ELEMENTS AND MATERIALS
402 A .1 Glass replacement. The installation or replacement of glass shall be as required for new installations in accordance with the California Building Code.
SECTION 403 A —FIRE PROTECTION
403 A .1 General. Fire protection shall comply with the California Building Standards Code.
SECTION 404 A —MEANS OF EGRESS
404 A .1 General. Repairs shall be done in a manner that maintains the level of protection provided for the means of egress.
SECTION 405 A —STRUCTURAL
405 A .1 General. Structural damage shall be repaired in compliance with this section and Section 401 A .2.
Exception: Routine maintenance required by Chapter 3A, ordinary repairs exempt from permit in accordance with California Building Code Section 105.2, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.
405 A .1.1 Structural concrete. Repair of structural concrete shall be permitted to comply with ACI 562 Section 1.7, except where Section 405.2.2, 405.2.3 or 405.2.4.1 requires compliance with Section 304.3.
405 A .2 Repairs to damaged buildings. Repairs to damaged buildings shall comply with this section.
405 A .2.1 Repairs for less than substantial structural damage. Unless otherwise required by this section, for damage less than substantial structural damage, the damaged elements shall be permitted to be restored to their predamage condition. New struc- tural members and connections used for this repair shall comply with the detailing provisions of this code for new buildings of similar structure, purpose and location.
405 A .2.1.1 Snow damage. Structural components whose damage was caused by or related to snow load effects shall be repaired, replaced or altered to satisfy the requirements of Section 1608 of the California Building Code .
405 A .2.2 Disproportionate earthquake damage. A building assigned to Seismic Design Category D, E or F that has sustained disproportionate earthquake damage shall be subject to the requirements for buildings with substantial structural damage to vertical elements of the lateral force-resisting system.
CEBC § 2.5.1.4 High relevance — show source text
0 1 2 3 4 5 6 7
8 9 10
FIRE-RESISTANCE RATING (HOURS)
TABLE 2.5.1.4
STEEL COLUMNS—CONCRETE ENCASEMENTS
MINIMUM DIMENSION 10″ TO LESS THAN 12″Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 ITEM
CODEMINIMUM
DIMENSIONCONSTRUCTION DETAILS PERFORMANCE PERFORMANCE REFERENCE NUMBER REFERENCE NUMBER REFERENCE NUMBER NOTES REC.
HOURSITEM
CODEMINIMUM
DIMENSIONCONSTRUCTION DETAILS LOAD TIME PRE-BMS-92 BMS-92 POST-BMS-92 POST-BMS-92 POST-BMS-92 C-10-SC-1 10″ 10″ × 12″ concrete encased steel column;
8″ × 6″ × 35 lbs “H” beam; protection: gravel
aggregate concrete (3640 psi); 6″ × 4″—13 SWG
mesh, 1″ below column surface.90
tons3 hrs
7 min7 1, 2 3 C-10-SC-2 10″ 10″ × 16″ column; 8″ × 6″ × 35 lbs “H” beam;
protection: clay brick concrete (3630 psi);
6″ × 4″—13 SWG mesh, 1″ below column
surface.90
tons4 hrs
6 min7 2 4 C-10-SC-3 10″ 10″ × 12″ column; 8″ × 6″ × 35 lbs “H” beam;
protection: crushed stone and sand concrete
(3930 psi); 6″ × 4″—13 SWG mesh, 1″ below
column surface.90
tons3 hrs
17 min7 2 31/4 C-10-SC-4 10″ 10″ × 12″ column; 8″ × 6″ × 35 lbs “H” beam;
protection: crushed basalt and sand concrete
(4350 psi); 6″ × 4″—13 SWG mesh, 1″ below
column surface.90
tons3 hrs
22 min7 2 31/3 C-10-SC-5 10″ 10″ × 12″ column; 8″ × 6″ × 35 lbs
“H” beam; protection: gravel aggregate
concrete (5570 psi); 6″ × 4″—13 SWG mesh.90
tons3 hrs
39 min7 2 31/2 C-10-SC-6 10″ 10″ × 16″ column; 8″ × 6″ × 35 lbs “I” beam;
protection: gravel concrete (4950 psi);CEBC § 105.2 High relevance — show source text
Exception: Routine maintenance required by Chapter 3A, ordinary repairs exempt from permit in accordance with California Building Code Section 105.2, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.
405 A .1.1 Structural concrete. Repair of structural concrete shall be permitted to comply with ACI 562 Section 1.7, except where Section 405.2.2, 405.2.3 or 405.2.4.1 requires compliance with Section 304.3.
405 A .2 Repairs to damaged buildings. Repairs to damaged buildings shall comply with this section.
405 A .2.1 Repairs for less than substantial structural damage. Unless otherwise required by this section, for damage less than substantial structural damage, the damaged elements shall be permitted to be restored to their predamage condition. New struc- tural members and connections used for this repair shall comply with the detailing provisions of this code for new buildings of similar structure, purpose and location.
405 A .2.1.1 Snow damage. Structural components whose damage was caused by or related to snow load effects shall be repaired, replaced or altered to satisfy the requirements of Section 1608 of the California Building Code .
405 A .2.2 Disproportionate earthquake damage. A building assigned to Seismic Design Category D, E or F that has sustained disproportionate earthquake damage shall be subject to the requirements for buildings with substantial structural damage to vertical elements of the lateral force-resisting system.
405 A .2.3 Substantial structural damage to vertical elements of the lateral force-resisting system. A building that has sustained substantial structural damage to the vertical elements of its lateral force-resisting system shall be evaluated in accordance with Section 405 A .2.3.1, and either repaired in accordance with Section 405 A .2.3.2 or repaired and retrofitted in accordance with Section 405 A .2.3.3, depending on the results of the evaluation.
405 A .2.3.1 Evaluation. The building shall be evaluated by a registered design professional, and the evaluation findings shall be submitted to the building official. The evaluation shall establish whether the lateral force-resisting system of the damaged building, including its foundation, if repaired to its predamage state, would comply with the provisions of the California Build- ing Code for load combinations that include wind and earthquake effects. Earthquake loads for this evaluation, if required, shall
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CEBC § 401.3 High relevance — show source text
[BS] 401.3 Flood hazard areas. In flood hazard areas, repairs that constitute substantial improvement shall require that the building comply with Section 1612 of the California Building Code, or Section R306 of the California Residential Code, as applicable.
SECTION 402—BUILDING ELEMENTS AND MATERIALS
402.1 Glazing in hazardous locations. Replacement glazing in hazardous locations shall comply with the safety glazing requirements of the California Building Code or California Residential Code as applicable.
Exception: Glass block walls, louvered windows and jalousies repaired with like materials.
402.2 Existing materials. [HCD] Existing materials shall comply with Section 302.3.
402.3 New and replacement materials. [HCD & HCD 2] New and replacement materials used for repairs shall comply with Section 302.4.
SECTION 403—FIRE PROTECTION
403.1 General. Repairs shall be done in a manner that maintains the level of fire protection provided.
SECTION 404—MEANS OF EGRESS
404.1 General. Repairs shall be done in a manner that maintains the level of protection provided for the means of egress.
SECTION 405—STRUCTURAL
[BS] 405.1 General. Structural damage shall be repaired in compliance with this section and Section 401.2.
405.1.1 Structural concrete. Repair of structural concrete shall be permitted to comply with ACI 562 Section 1.7, except where Section 405.2.2, 405.2.3 or 405.2.4.1 requires compliance with Section 304.3.
[BS] 405.2 Repairs to damaged buildings. Repairs to damaged buildings shall comply with this section.
[BS] 405.2.1 Repairs for less than substantial structural damage. Unless otherwise required by this section, for damage less than substantial structural damage, the damaged elements shall be permitted to be restored to their predamage condition.
[BS] 405.2.1.1 Snow damage. Structural components whose damage was caused by or related to snow load effects shall be repaired, replaced or altered to satisfy the requirements of Section 1608 of the California Building Code .
[BS] 405.2.2 Disproportionate earthquake damage. A building assigned to Seismic Design Category D, E or F that has sustained disproportionate earthquake damage shall be subject to the requirements for buildings with substantial structural damage to vertical elements of the lateral force-resisting system.
[BS] 405.2.3 Substantial structural damage to vertical elements of the lateral force-resisting system. A building that has sustained substantial structural damage to the vertical elements of its lateral force-resisting system shall be evaluated in accordance with Section 405.2.3.1, and either repaired in accordance with Section 405.2.3.2 or repaired and retrofitted in accordance with Section 405.2.3.3, depending on the results of the evaluation.
Exceptions:
- Buildings assigned to Seismic Design Category A, B or C whose substantial structural damage was not caused by earthquake need not be evaluated or retrofitted for load combinations that include earthquake effects.
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California Existing Building Code High relevance — show source text
**
HOURS| |ITEM
CODE|MEMBRANE
THICKNESS|CONSTRUCTION DETAILS|LOAD|TIME|PRE-BMS-92|BMS-92|POST-BMS-92|POST-BMS-92|POST-BMS-92| |F/C-S-34|21/2″|Floor: 2″ reinforced concrete or 2″ precast
reinforced Portland cement concrete or
gypsum slabs, precast slabs to be finished
with1/4″ mortar top coat; ceiling: 2″ precast
reinforced gypsum tile, anchored into
beams with metal ties or clips and covered
with1/2″ 1:3 sanded gypsum plaster.|See
Note 12|4 hrs||1||12–14|4| |F/C-S-35|1″|Floor: 1:3:6 Portland cement, sand and
gravel concrete applied directly to the top of
steel units and 11/2″ thick at top of cells, plus
1/2″ 1:21/2″ cement-sand finish, total thick-
ness at top of cells, 2″; ceiling: 1″ neat
gypsum plaster, back of lath 2″ or more
from underside of cellular steel.|See
Note 15|3 hrs||1||15–18|3| |F/C-S-36|1″|Floor: same as F/C-S-35; ceiling: 1″ gypsum-
vermiculite plaster (ratio of gypsum to
vermiculite 2:1 to 3:1), the back of lath 2″ or
more from under-side of cellular steel.|See
Note 15|4 hrs||1||15–18|4| |F/C-S-37|1″|Floor: same as F/C-S-35; ceiling: 1″ neat
gypsum plaster; back of lath 9″ or more from
underside of cellular steel.|See
Note 15|4 hrs||1||15–18|4| |F/C-S-38|1″|Floor: same as F/C-S-35; ceiling: 1″ gypsum-
vermiculite plaster (ratio of gypsum to
vermiculite 2:1 to 3:1), the back of lath being
9″ or more from underside of cellular steel.|See
Note 15|5 hrs||1||15–18|5| |F/C-S-39|3/4″|Floor: asbestos paper 14 lbs/100 ft2
cemented to steel deck with waterproof
linoleum cement, wood screeds and7/8″
wood floor; ceiling:3/4″ sanded gypsum plas-
ter 1:2 for scratch coat and 1:3 for brown
coat.|See
Note 19|1 hr||1||19–22|1| |F/C-S-40|3/4″|Floor: 11/2″ 1:2:4 Portland cement concrete;
ceiling:3/4″ sanded gypsum plaster 1:2 for
scratch coat and 1:3 for brown coat.CEBC § 401.1 High relevance — show source text
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4 REPAIRS
User notes:
About this chapter: Chapter 4 provides requirements for repairs of existing buildings. The provisions define conditions under which repairs may be made using materials and methods like those of the original construction or the extent to which repairs must comply with requirements for new buildings.
SECTION 401—GENERAL
401.1 Scope. R epairs shall comply with the requirements of this chapter. Repairs to historic buildings and structures shall comply with Part 8, Title 24, C.C.R. [OSHPD 1R, 2, 4 & 5] Repairs to historic buildings not adopted by OSHPD. Repairs shall comply with the requirements in the California Building Code, Sections 1224.2, 1225.2, 1226.2, 1227.2 and 1228.2 for functional requirements as applicable.
401.1.1 Bleachers, folding and telescopic seating and grandstands. Repairs to existing bleachers, folding and telescopic seating and grandstands shall comply with ICC 300.
401.1.2 Scope. [BSC] For state-owned buildings, including those owned by the University of California and the California State University and the Judicial Council, the requirements of Sections 405.2.1 and 405.2.3 are replaced by the requirements of Sections 317 through 322.
401.2 Compliance. The work shall not make the building less complying than it was before the repair was undertaken. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to requirements for alterations.
[BS] 401.3 Flood hazard areas. In flood hazard areas, repairs that constitute substantial improvement shall require that the building comply with Section 1612 of the California Building Code, or Section R306 of the California Residential Code, as applicable.
SECTION 402—BUILDING ELEMENTS AND MATERIALS
402.1 Glazing in hazardous locations. Replacement glazing in hazardous locations shall comply with the safety glazing requirements of the California Building Code or California Residential Code as applicable.
Exception: Glass block walls, louvered windows and jalousies repaired with like materials.
402.2 Existing materials. [HCD] Existing materials shall comply with Section 302.3.
402.3 New and replacement materials. [HCD & HCD 2] New and replacement materials used for repairs shall comply with Section 302.4.
SECTION 403—FIRE PROTECTION
403.1 General. Repairs shall be done in a manner that maintains the level of fire protection provided.
SECTION 404—MEANS OF EGRESS
404.1 General. Repairs shall be done in a manner that maintains the level of protection provided for the means of egress.
SECTION 405—STRUCTURAL
[BS] 405.1 General. Structural damage shall be repaired in compliance with this section and Section 401.2.
405.1.1 Structural concrete. Repair of structural concrete shall be permitted to comply with ACI 562 Section 1.7, except where Section 405.2.2, 405.2.3 or 405.2.4.1 requires compliance with Section 304.3.
CEBC § 2.2 High relevance — show source text
405 A .2.2 Disproportionate earthquake damage. A building assigned to Seismic Design Category D, E or F that has sustained disproportionate earthquake damage shall be subject to the requirements for buildings with substantial structural damage to vertical elements of the lateral force-resisting system.
405 A .2.3 Substantial structural damage to vertical elements of the lateral force-resisting system. A building that has sustained substantial structural damage to the vertical elements of its lateral force-resisting system shall be evaluated in accordance with Section 405 A .2.3.1, and either repaired in accordance with Section 405 A .2.3.2 or repaired and retrofitted in accordance with Section 405 A .2.3.3, depending on the results of the evaluation.
405 A .2.3.1 Evaluation. The building shall be evaluated by a registered design professional, and the evaluation findings shall be submitted to the building official. The evaluation shall establish whether the lateral force-resisting system of the damaged building, including its foundation, if repaired to its predamage state, would comply with the provisions of the California Build- ing Code for load combinations that include wind and earthquake effects. Earthquake loads for this evaluation, if required, shall
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be permitted to be 75 percent of those prescribed in California Building Code Section 1613A. Alternatively, where the earthquake damage has not resulted in disproportionate earthquake damage or did not result in collapse, the earthquake load evaluation shall be permitted to be performed in accordance with Section 304A.3.4.4 for SPC-2 buildings and Section 304A.3.4.5 for buildings rated SPC-3, SPC-4D and SPC-4. SPC-5 buildings shall be permitted to be evaluated in accordance with Section 304A.3.4.6, except that the seismic hazard shall be permitted to be reduced to BSE-1E and BSE-2E.
405 A .2.3.2 Extent of repair for compliant buildings. If the evaluation establishes that the building in its predamage condition complies with the provisions of Section 405.2.3.1, then the damaged elements shall be permitted to be restored to their predamage condition.
405 A .2.3.3 Extent of repair for noncompliant buildings. If the evaluation does not establish that the lateral force-resisting system of the building in its predamage condition complies with the provisions of Section 405.2.3.1, then the lateral forceresisting system, and its foundation, shall be retrofitted to comply with the provisions of this section. The wind loads for the repair and retrofit shall be those required by the building code in effect at the time of original construction, unless the damage was caused by wind, in which case the wind loads shall be in accordance with the California Building Code . The earthquake loads shall not be less than those required by the building code in effect at the time of original construction but not less than 75 _percent of those prescribed in California Building Code Section 1613A.
CEBC § 2.5 High relevance — show source text
ceiling: 1″ 1:2 sanded gypsum plaster.|See
Note 19|2 hrs
30 min||1||19–22|21/2| |F/C-S-46|3/4″|Floor: 21/2″ 1:2:4 Portland cement concrete;
ceiling: 1″ neat gypsum plaster or3/4″
gypsum-vermiculite plaster, ratio of gypsum
to vermiculite 2:1 to 3:1.|See
Note 19|3 hrs||1||19–22|3| |F/C-S-47|11/8″|Floor: 21/2″ 1:2:4 Portland cement, sand and
cinder concrete plus1/2″ 1:21/2 cement-sand
finish; total thickness 3″; ceiling: 11/8″ 1:1
sanded gypsum plaster.|See
Note 19|3 hrs||1||19–22|3| |F/C-S-48|11/8″|Floor: 21/2″ gas expanded Portland cement-
sand concrete plus1/2″ 1:2.5 cement-sand
finish; total thickness 3″; ceiling: 11/8″ 1:1
sanded gypsum plaster.|See
Note 19|3 hrs
30 min||1||19–22|31/2|2025 CALIFORNIA EXISTING BUILDING CODE RESOURCE A-99
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
RESOURCE A—GUIDELINES ON FIRE RATINGS OF ARCHAIC MATERIALS AND ASSEMBLIES
TABLE 3.2—continued
FLOOR/CEILING ASSEMBLIES—STEEL STRUCTURAL ELEMENTSCol2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 ITEM
CODEMEMBRANE
THICKNESSCONSTRUCTION DETAILS PERFORMANCE PERFORMANCE REFERENCE NUMBER REFERENCE NUMBER REFERENCE NUMBER NOTES REC.
HOURSITEM
CODEMEMBRANE
THICKNESSCONSTRUCTION DETAILS LOAD TIME PRE-BMS-92 BMS-92 POST-BMS-92 POST-BMS-92 POST-BMS-92 F/C-S-49 1″ Floor: 21/2″ 1:2:4 Portland cement concrete;
ceiling: 1″ gypsum vermiculite plaster, ratio
of gypsum to vermiculite 2:1 to 3:1.See
Note 194 hrs 1 19–22 4 F/C-S-50 21/2″ Floor: 2″ 1:2:4 Portland cement concrete; ceil-
ing: 2″ interlocking gypsum tile supported on
upper face of lower flanges of beams,1/2″ 1:3
sanded gypsum plaster.CEBC § 1.9.2.1.4 High relevance — show source text
Exception: Chapters 16A, 17A, 18A, 19A, 21A and 22A—Amendments appearing in these chapters without an acronym have been co-adopted by DSA-SS and OSHPD.
1.9.2.1.4 Reference to other chapters. Where reference is made within the California Building Standards Code (CBSC) to sections in Chapters 16, 17, 18, 19, 21 and 22, the respective sections in Chapters 16A, 17A, 18A, 19A, 21A and 22A shall apply instead.
1.9.2.2 DSA-SS/CC Division of the State Architect- Structural Safety/Community Colleges
Application— Community Colleges. The Division of the State Architect has been delegated the authority by the Department of General Services to promulgate alternate building standards for application to community colleges, which a community college may elect to use in lieu of standards promulgated by DSA-SS in accordance with Section 1.9.2.1.
Enforcing agency— Division of the State Architect- Structural Safety/Community Colleges (DSA-SS/CC)
The Division of the State Architect has been delegated the authority by the Department of General Services to review and approve the design and oversee construction of community colleges electing to use the alternative building standards as provided in this section.
Authority cited— Education Code Section 81053.
Reference— Education Code Sections 81052, 81053 and 81130 through 81147.
1.9.2.2.1 Applicable administrative standards.
1. Title 24, Part 1, California Code of Regulations: 1.1. Sections 4-301 through 4-355, Group 1, and Sections 4-401 through 4-435, Group 2, Chapter 4. 2. Title 24, Part 2, California Code of Regulations: 2.1. Sections 1.1 and 1.9.2 of Chapter 1, Division I. 2.2. Sections 102.1, 102.2, 102.3, 102.4, 102.5, 104.2.3, 104.9, 104.10, 106.1, 107.2.5, 110.3.5 and 110.3.7 of Chapter 1, Division II.
1.9.2.2.2 Applicable building standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10, 11 and 12, Califor- nia Code of Regulations.
The Division of the State Architect-Structural Safety/Community Colleges [DSA-SS/CC] adopts the following building standards in Title 24, Part 2:
Chapters 2 through 10, 12, 14, 15, 16, 17A, 18A, 19, 20, 21, 22, 23, 24, 25, 26, 30, 31, 32, 33 and 35.
CEBC § 2.3.2 High relevance — show source text
405 A .2.3.2 Extent of repair for compliant buildings. If the evaluation establishes that the building in its predamage condition complies with the provisions of Section 405.2.3.1, then the damaged elements shall be permitted to be restored to their predamage condition.
405 A .2.3.3 Extent of repair for noncompliant buildings. If the evaluation does not establish that the lateral force-resisting system of the building in its predamage condition complies with the provisions of Section 405.2.3.1, then the lateral forceresisting system, and its foundation, shall be retrofitted to comply with the provisions of this section. The wind loads for the repair and retrofit shall be those required by the building code in effect at the time of original construction, unless the damage was caused by wind, in which case the wind loads shall be in accordance with the California Building Code . The earthquake loads shall not be less than those required by the building code in effect at the time of original construction but not less than 75 percent of those prescribed in California Building Code Section 1613A. Alternatively, where the earthquake damage has not resulted in disproportionate earthquake damage or did not result in collapse, the retrofit shall be permitted to be performed in accordance with Section 304A.3.4.4 for SPC-2 buildings, Section 304A.3.4.5 for SPC-3, SPC-4D and SPC-4 buildings and Section 304A.3.4.6 for SPC-5 buildings. For SPC-5 buildings, the seismic hazard shall be permitted to be reduced to BSE-1E and BSE-2E. Use of Section 304A.3.4.5 to rehabilitate SPC-3, SPC-4D and SPC-4 buildings will result in re-classification of the building to SPC-4D. Noncompliant SPC-4 buildings may be rehabilitated to SPC-5 in accordance with Section 304A.3.4.6 using the reduced seismic hazard. New structural members and connections required by this rehabilitation design shall comply with the detailing provisions of this code for new buildings of similar structure, purpose and location.
405 A .2.4 Substantial structural damage to gravity load-carrying components. Gravity load-carrying components that have sustained substantial structural damage shall be retrofitted to comply with the applicable provisions for dead, live and snow loads in the California Building Code . Undamaged gravity load-carrying components, including undamaged foundation components, that receive dead, live or snow loads from retrofitted components shall also be retrofitted if required to comply with these design loads. New structural members and connections required by this rehabilitation design shall comply with the detailing provi- sions of this code for new buildings of similar structure, purpose and location.
405 A .2.4.1 Lateral force-resisting elements. Regardless of the level of damage to vertical elements of the lateral force-resisting system, if substantial structural damage to gravity load-carrying components was caused primarily by wind or seismic effects, then the building shall be evaluated in accordance with Section 405 A .2.3.1 and, if noncompliant, retrofitted in accordance with Section 405 A .2.3.3.
Exceptions:
Frequently asked questions
Is ACI 562 always permissible for any concrete repair on an existing building?
No. The CEBC permits ACI 562 Section 1.7 for repairs of structural concrete per § 405.1.1, but if Sections 405.2.2, 405.2.3, or 405.2.4.1 apply (disproportionate or substantial structural damage), the work must follow Section 304.3 instead.
Which edition of ACI 562 does the CEBC reference?
The CEBC’s Chapter 16 lists ACI 562—21 as the referenced standard tied to § 405.1.1; always confirm the adopted standard edition in Chapter 16 before using it.
What exactly in ACI 562 is referenced by the CEBC?
The code text of § 405.1.1 permits compliance with ACI 562 Section 1.7 (the CEBC points to that specific section of the standard as the compliance path).
If my building had an earthquake, do I still use ACI 562?
Not automatically. For disproportionate earthquake damage or substantial structural damage, the CEBC directs evaluation and may require following Section 304.3 rather than ACI 562. See § 405.2.2 and § 405.2.3.
Where do I find the CEBC language that lists ACI 562?
Chapter 16 (Referenced Standards) lists ACI 562—21 with a code reference to 405.1.1; the language of § 405.1.1 appears in Chapter 4 (Repairs).
More in California Existing Building Code
- Administration and Definitions (Scope, enforcement, code official duties, definitions)
- Provisions for All Compliance Methods (general requirements that apply to all compliance options; Chapter 3 / 3A)
- Seismic retrofit and evaluation (Appendix A and seismic provisions/sections for evaluation and retrofit)
- Referenced Standards and Appendices (Chapter 16 and Appendices A–E, Resource A)
- Repairs (Chapter 4 — repair-specific rules for materials, means of egress, structural, MEP, etc.)
- Alterations — Level 1, Level 2, Level 3 (technical requirements for each alteration level; Chapters 7–9)
- Change of Occupancy and Additions (requirements for occupancy changes and additions; Chapters 10–11)
- Compliance Methods — Prescriptive, Work Area, Performance (Chapters 5, 6–11, 13)
- Relocated Buildings (requirements for buildings moved or relocated; Chapter 14)
- Construction Safeguards (site safety, means of egress and life-safety during construction; Chapter 15)
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