CRC · California Residential Code
How are referenced standards incorporated into the CRC?
Referenced standards are enforceable under the CRC only where the code explicitly cites them (see § R102.4); the CRC text controls in any conflict (see § R102.4.1 and § R102.4.2), except when enforcing the code would violate a product listing or its conditions — in that case, the listing and manufacturer instructions apply.
Last reviewed: July 6, 2026
What the code requires — plain English
The California Residential Code makes referenced standards legally part of the CRC to the extent each standard is cited in the code (see § R102.4). Where a referenced standard would conflict with a CRC provision, the CRC controls (see § R102.4.1 and § R102.4.2). There is a specific exception: if enforcing a code provision would violate an equipment or appliance listing (or its listing conditions), the listing and manufacturer instructions govern instead — see § R102.4 (Exception).
The single most important rule: referenced standards are part of the CRC only where the CRC explicitly refers to them, and when a conflict exists the CRC text takes precedence.
Requirements in detail
What “incorporated” means
- Referenced standards are not loose guidance — they become enforceable requirements only where the CRC cites them. The CRC includes a chapter that lists referenced standards and the sections that use them; see Chapter 44 — Referenced Standards for the lists, effective dates and where each standard applies.
- The precise scope of each incorporated standard is the “prescribed extent of each such reference” in the CRC language. In other words, only the topics the CRC points to are adopted.
How conflicts are resolved
- If the CRC text and a referenced standard differ, the CRC text governs. This is stated at § R102.4.1.
- If a referenced standard includes subject matter that is also within the scope of the CRC, the CRC’s provisions take precedence (see § R102.4.2).
Where the lists live and how to read them
- The CRC collects all referenced standards in Chapter 44 (Part IX), which shows the standard ID, effective date and the code sections that reference it. Use that table to confirm the exact edition and which CRC sections rely on it.
- Appendices and specialty sections also include referenced-standard tables (for example, Appendix BH lists ASTM F2200 and UL 325 for automatic vehicular gates), showing direct, section-level incorporation.
Decision table (quick reference)
| Decision dimension | Values / rule | Code Reference |
|---|---|---|
| When a standard is enforceable as code | Only when the CRC explicitly references it; only to the prescribed extent of that reference | § R102.4 |
| Who wins on conflict | CRC provisions prevail over referenced standards | § R102.4.1 |
| When a referenced standard includes overlapping subject matter | CRC provisions take precedence when within CRC scope | § R102.4.2 |
| Exception for listed equipment | If enforcing the CRC would violate an equipment listing, the listing and manufacturer instructions apply | § R102.4 (Exception) |
| Where to find the authoritative list/edition | Chapter 44—Referenced Standards (lists standard IDs, dates, and where each is cited) | § 44 (Part IX) |
| How appendices show referenced standards | Appendix tables (e.g., BH104.1) list the standard and the specific appendix sections using it | Appendix BH (BH104.1) |
Exceptions & special cases
- Listing/manufacturer instructions exception: if enforcement of a code provision would violate the conditions of the product’s listing, the building official must follow the listing/manufacturer instructions instead of the conflicting CRC provision. § R102.4 (Exception) controls this.
- Editions and effective dates matter: Chapter 44 includes the effective date or edition for each referenced standard. You must apply the edition the CRC lists — check Chapter 44 before assuming a newer edition applies.
- Appendix adoption: some appendices are optional or agency-adopted; referenced standards inside an appendix only apply if that appendix is adopted by the authority having jurisdiction. See appendix headers and matrix adoption notes.
Common mistakes
- Assuming every external standard mentioned anywhere is automatically enforceable — only standards explicitly referenced in the CRC (and to the extent cited) are part of the code.
- Using the wrong edition — Chapter 44 identifies the edition/effective date; using a newer (or older) edition without confirmation is a frequent error.
- Forgetting the precedence rules — designers sometimes apply a referenced standard’s requirement even when a CRC provision specifically covers the same subject; the CRC provision controls. § R102.4.1 and § R102.4.2.
- Overlooking the listing/manufacturer-instruction exception — inspectors may wrongly cite a CRC provision when following it would break a product listing. The listing then controls. § R102.4 (Exception).
Worked example — concrete scenario
Scenario: An automatic vehicular gate at a new single-family project is installed. Appendix BH requires gates “intended for automation” to comply with ASTM F2200—20 and gate openers to be listed in accordance with UL 325 (see Appendix BH).
Application steps:
- Confirm the CRC actually references ASTM F2200 and UL 325 for this element — Appendix BH does, so those standards are incorporated for the appendix scope. (Appendix BH: BH103.1, BH103.2; BH104.1 table)
- Use the edition listed in the BH table (for example, “ASTM F2200—20” and “UL 325—2017” as shown in the table) — that edition is the enforceable version.
- If the UL 325 listing for a particular gate opener contains conditions that would be violated by an otherwise-compliant CRC appendix requirement, follow the listing/manufacturer instructions per § R102.4 (Exception).
- If a conflict arises between a requirement stated directly in Appendix BH (CRC text) and a provision in ASTM F2200, the CRC text in Appendix BH controls per § R102.4.1 and § R102.4.2.
Related provisions
- § R102.4 — Referenced codes and standards (main rule).
- § R102.4.1 — Conflicts: CRC provisions control when conflicts occur.
- § R102.4.2 — When referenced standards overlap CRC scope, CRC takes precedence.
- § R102.1 — General applicability and resolution of general vs. specific requirements.
- § R102.3 — How internal references to chapters/sections are construed.
- § R102.5 — Partial invalidity (useful when considering severability of standards).
- § 44 (Part IX — Referenced Standards) — The compiled list of all referenced standards, editions and where they are cited in the CRC.
- Appendix BH (BH103, BH104.1) — Example of how an appendix incorporates standards (ASTM F2200, UL 325).
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 1974-17 High relevance — show source text
E108-2020a|||X||||||||||||||||||||| |CSA||||X|||||||||||||||||||| |DASMA||||X|||||||||||||||||||| |ICC|||X|X|||||||||||||||||||| |IFC-18||||X|||||||||||||||||||| |ISO||||X|||||||||||||||||||| |NFPA|||X|X|||||||||||||||||||| |NFPA 68-13|||X||||||||||||||||||||| |SFM|||X||||||||||||||||||||| |UBC|||X||||||||||||||||||||| |UL||||X|||||||||||||||||||| |UL 790 Edition 9 2022|||X||||||||||||||||||||| |UL 1974-17|||X||||||||||||||||||||| |UL 9540-20|||X||||||||||||||||||||| |UL 9540 Edition 4 2019|||X||||||||||||||||||||| |WDMA||||X||||||||||||||||||||
The state agency does not adopt sections identified with the following symbol: †
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Part IX— Referenced Standards
44 REFERENCED STANDARDS
Notwithstanding California laws and regulations, these referenced standards shall be applicable only to those California Residential Code sections that are adopted.
User notes:
About this chapter: The one- and two-family dwelling code contains numerous references to standards promulgated by other organizations that are used to provide requirements for materials, products and methods of construction. Chapter 44 contains a comprehensive list of all standards that are referenced in this code. These standards, in essence, are part of this code to the extent of the reference to the standard.
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 R102.4.
ABTG Applied Building Technology Group LLC6300 Enterprise Lane Madison, WI 53719
ANSI/ABTG FS 100—2012 (R2018): Standard Requirements for Wind Pressure Resistance of Foam Plastic Insulation Sheathing Used in Exterior Wall Covering Assemblies
R303.8
ACCA Air Conditioning Contractors of America 1330 Braddock Place, Suite 350 Alexandria, VA 22314
ANSI/ACCA 2 Manual J—2016: Residential Load Calculation
Table R301.2
ACI American Concrete Institute 38800 Country Club Drive Farmington Hills, MI 48331
CRC § 508.5 High relevance — show source text
Exception: The following shall be permitted to be constructed in accordance with this code where provided with an automatic sprinkler system complying with Section R309 :
Live/work units located in townhouses and complying with the requirements of Section 508.5 of the California Building Code.
Owner-occupied lodging houses with five or fewer guestrooms.
A care facility with five or fewer persons receiving custodial care within a dwelling unit.
A care facility with five or fewer persons receiving medical care within a dwelling unit.
A day care facility for five or fewer persons of any age receiving care within a dwelling unit.
R101.2.1 Appendices. Provisions in the appendices shall not apply unless specifically adopted.
R101.3 Purpose. The purpose of this code is to establish minimum requirements to provide a reasonable level of safety, health and general welfare through affordability, structural strength, means of egress, stability, sanitation, light and ventilation, energy conservation and safety to life and property from fire and other hazards and to provide a reasonable level of safety to firefighters and emergency responders during emergency operations.
SECTION R102—APPLICABILITY
R102.1 General. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall be applicable. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern.
R102.2 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.
R102.3 Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.
R102.4 Referenced codes and standards. The codes and standards referenced in this code shall be considered part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections R102.4.1 and R102.4.2.
Exception: Where enforcement of a code provision would violate the conditions of the listing of the equipment or appliance, the conditions of the listing and manufacturer’s instructions shall apply.
R102.4.1 Conflicts. Where conflicts occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.
R102.4.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.
R102.5 Partial invalidity. In the event any part or provision of this code is held to be illegal or void, this shall not have the effect of making void or illegal any of the other parts or provisions.
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DIVISION II SCOPE AND ADMINISTRATION
R102.6 Existing structures. The legal occupancy of any structure existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code, the International Property Maintenance Code or the California Fire Code, or as is deemed necessary by the building official for the general safety and welfare of the occupants and the public.
CRC § 101.2.2 Medium relevance — show source text
CFC—25: California Fire Code
101.2.2, 101.4.2, 301.3.1, 302.2, 307.1, 308.1, 802.2.1, 802.2.3, 803.2.3, 803.4.1.1, 803.4.1.2, 803.4.1.3, 803.4.1.4, 803.4.1.5, 803.4.1.6, Table 804.5.1.1(1), 904.1.5, 1011.6.1.1, 1303.1.2, 1305.2.8.1, 1305.2.14, 1305.2.14.1, 1401.2, 1501.1, 1501.5, 1502.1, 1502.1.1, 1502.2, 1502.3, 1504.1, 1507.1, 1507.2
CMC—25: California Mechanical Code
302.2, 702.7, 807.1, 902.1.1, 1008.1, 1305.2.7.1, 1305.2.8, 1305.2.8.1
CPC—25: California Plumbing Code
302.2, 408.1, 702.7, 1009.1, 1009.2, 1009.3, 1009.5, 1302.1.6, 1503.1
16-4 2025 CALIFORNIA EXISTING BUILDING CODE
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REFERENCED STANDARDS
CRC—25: California Residential Code
101.2, 101.4.1, 104.3.1, 109.3.3, 109.3.10, 302.2, 307.1, 308.1, 401.3, 402.1, 405.2.6, 502.2, 502.3, 502.4, 503.2, 503.3, 503.11, 505.2, 505.3, 507.3, 701.3, 702.4, 702.5, 706.2, 708.1, 805.2, 806.4, 809.1, 906.2, 907.1, 1011.2.1, 1103.1, 1103.2, 1103.3, 1104.1, 1201.4, 1302.1.2, 1302.1.3, 1302.1.3, 1303.1.3, 1401.2, 1402.1, 1402.2, 1402.2.1, 1402.3, 1402.4, 1402.5, 1402.6
ICC 300—2023: ICC Standard on Bleachers, Folding and Telescopic Seating and Grandstands
301.1.1, 401.1.1, 1401.1.1
ICC A117.1—2017: Accessible and Usable Buildings and Facilities
CRC § 1-16 Medium relevance — show source text
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DIVISION II SCOPE AND ADMINISTRATION
User notes:
About this chapter: Chapter 1 Division II establishes the limits of applicability of this code and describes how the code is to be applied and enforced. Chapter 1 Division II is in two parts: Part 1—Scope and Application (Sections R101–R102) and Part 2—Administration and Enforcement (Sections R103–R114). Section R101 identifies which buildings and structures come under its purview and references other I-Codes as applicable. Standards and codes are scoped to the extent referenced (see Section R102.4).
The one- and two-family dwelling code is intended to be adopted as a legally enforceable document, and it cannot be effective without adequate provisions for its administration and enforcement. The provisions of Chapter 1 establish the authority and duties of the building official appointed by the authority having jurisdiction and also establish the rights and privileges of the design professional, contractor and property owner.
Division II is not adopted by the Department of Housing and Community Development except where specifically indicated. Note: Specific sections of Chapter 1, Division II adopted by the State Fire Marshal will be indicated in the Matrix Adoption Table.
PART 1—SCOPE AND APPLICATION
SECTION R101—SCOPE AND GENERAL REQUIREMENTS
R101.1 Title. These provisions shall be known as the Residential Code for One- and Two-family Dwellings of [ NAME OF JURISDICTION ], and shall be cited as such and will be referred to herein as “this code.”
R101.2 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition of detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures not more than three stories above grade plane in height.
Exception: The following shall be permitted to be constructed in accordance with this code where provided with an automatic sprinkler system complying with Section R309 :
Live/work units located in townhouses and complying with the requirements of Section 508.5 of the California Building Code.
Owner-occupied lodging houses with five or fewer guestrooms.
A care facility with five or fewer persons receiving custodial care within a dwelling unit.
A care facility with five or fewer persons receiving medical care within a dwelling unit.
A day care facility for five or fewer persons of any age receiving care within a dwelling unit.
R101.2.1 Appendices. Provisions in the appendices shall not apply unless specifically adopted.
R101.3 Purpose. The purpose of this code is to establish minimum requirements to provide a reasonable level of safety, health and general welfare through affordability, structural strength, means of egress, stability, sanitation, light and ventilation, energy conservation and safety to life and property from fire and other hazards and to provide a reasonable level of safety to firefighters and emergency responders during emergency operations.
SECTION R102—APPLICABILITY
R102.1 General. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall be applicable. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern.
CRC § 504.9 Medium relevance — show source text
E2707—2022: Standard Test Method for Determining Fire Penetration of Exterior Wall Assemblies Using a Direct Flame Impingement Exposure
504.5, 504.9, 504.9.3
E2726/E2726M—2012a(2017): Standard Test Method for Evaluating the Fire Test Response of Deck Structures to Burning Brands
504.7.3.2, 504.7.3.3, 504.7.3.3.2
E2768—11(2018): Standard Test Method for Extended Duration Surface Burning Characteristics of Building Materials (30 min Tunnel Test)
503.2.4
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REFERENCED STANDARDS
E2886/E2886M—20: Standard Test Method for Evaluating the Ability of Exterior Vents to Resist the Entry of Embers and Direct Flame Impingement
504.10.1
E2957—2017 : Standard Test Method for Resistance to Wildfire Penetration of Eaves, Soffits and Other Projections
504.3, 504.7, 504.7.1, 504.7.2
G155—2021: Standard Practice for Operating Xenon Arc Lamp Apparatus for Exposure of Materials
504.9.2
ICC International Code Council, Inc., 200 Massachusetts Avenue, NW, Suite 250, Washington, DC 20001
CBC—2025: California Building Code
1.1.7.3.1, 1.11.2.1.2, 1.11.3.4, 1.11.6 – 1.11.10, 101.3.1, 102.8, 105.1, 105.3, 106.3, 202, 404.10.3, 501.1, 501.3, 503.1, 503.2.2, 503.2.3, 504.2.1.2, 504.3, 504.3.1, 504.5, 504.5.2, 504.6, 504.7, 504.7.3.2, 504.8, 504.11, 504.11.1
CEBC—2025: California Existing Building Code
1.11.3.4, 102.8, 201.3
CFC—2025: California Fire Code
1.11.3.4, 1.11.9, 1.11.10, 102.8, 105.1, 201.3, 202, 402.1.1, 402.1.2, 402.2.1, 402.2.2, 403.2.4, 404.2, 404.4, 404.5, 404.10.3, 606.1, 606.2
CRC—2025: California Residential Code
1.1.7.3.1, 102.8
NFPA National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471
CRC § 1.1.4 Medium relevance — show source text
1.1.4 Appendices. Provisions contained in the appendices of this code shall not apply unless specifically adopted by a state agency or adopted by a local enforcing agency in compliance with Health and Safety Code, Section 18901 et. seq. for Building Standards Law, Health and Safety Code, Section 17950 for State Housing Law and Health and Safety Code, Section 13869.7 for Fire Protection Districts. See Section 1.1.8 of this code.
1.1.5 Referenced codes. The codes, standards, and publications adopted and set forth in this code, including other codes, standards, and publications referred to herein are, by title and date of publication, hereby adopted as standard reference documents of this code. When this code does not specifically cover any subject related to building design and construction, recognized architectural or engineer- ing practices shall be employed. The National Fire Codes, standards, and the Fire Protection Handbook of the National Fire Protection Association are permitted to be used as authoritative guides in determining recognized fire prevention engineering practices.
1.1.6 Nonbuilding standards, orders, and regulations. Requirements contained in the California Wildland-Urban Interface Code, or in any other referenced standard, code, or document, which are not building standards as defined in Health and Safety Code, Section 18909 shall not be construed as a building standard. The nonbuilding standards contained herein are applicable in the wildland inter- face areas and can be cited as a section of this code, or where the section is identified on the tagline by the source document, the provision can be cited under the source document.
1.1.7 Order of precedence and use.
1.1.7.1 Differences. In the event of any differences between these building standards and the standard reference documents, the text of these building standards shall govern.
1.1.7.2 Specific provisions. Where a specific provision varies from a general provision, the specific provision shall apply.
1.1.7.3 Conflicts. When the requirements of this code conflict with the requirements of any other part of the California Building Stan- dards Code, Title 24, the most restrictive requirements shall prevail.
1.1.7.3.1 CBC and CRC. Detached one- and two-family dwellings, efficiency dwelling units, lodging houses, live/work units, and townhouses not more than three stories above grade plane with a separate means of egress, and their accessory structures, may be designed and constructed in accordance with the California Building Code or the California Residential Code, but not both, unless the proposed structure(s) or element(s) exceed the design limitations established in the California Residential Code, and the code user is specially directed by the California Residential Code to use the California Building Code.
1.1.8 City, county, or city and county amendments, additions or deletions. The provisions of this code do not limit the authority of city, county, or city and county governments to establish more restrictive and reasonably necessary differences to the provisions
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ADMINISTRATION
CRC § 2025 Medium relevance — show source text
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BH-1
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APPENDIX BH-2 2025 CALIFORNIA RESIDENTIAL CODE
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BH AUTOMATIC VEHICULAR GATES
The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.
User notes:
About this appendix: Appendix BH provides requirements for automatic vehicular gates, including a definition of and references to standards that regulate such gates.
SECTION BH101—GENERAL
BH101.1 General. The provisions of this appendix shall control the design and construction of automatic vehicular gates installed on the lot of a one- or two-family dwelling.
SECTION BH102—DEFINITION
BH102.1 General. The following term shall, for the purposes of this appendix, have the meaning shown herein.
VEHICULAR GATE. A gate that is intended for use at a vehicular entrance or exit to the lot of a one- or two-family dwelling, and that is not intended for use by pedestrian traffic.
SECTION BH103—AUTOMATIC VEHICULAR GATES
BH103.1 Vehicular gates intended for automation. Vehicular gates intended for automation shall be designed, constructed and installed to comply with the requirements of ASTM F2200.
BH103.2 Vehicular gate openers. Vehicular gate openers, where provided, shall be listed in accordance with UL 325.
SECTION BH104—REFERENCED STANDARDS
BH104.1 General. See Table BH104.1 for standards that are referenced in various sections of this appendix. Standards are listed by the standard identification with the effective date, the standard title, and the section or sections of this appendix that reference the standard.
TABLE BH104.1—REFERENCED STANDARDS Col2 Col3 STANDARD
ACRONYMSTANDARD NAME SECTIONS
HEREIN REFERENCEDASTM F2200—20 Standard Specification for Automated Vehicular Gate Construction BH103.1 UL 325—2017 Door, Drapery, Gate, Louver and
Window Operations and Systems—with Revisions through February 2020BH103.2 2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BH-3
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APPENDIX BH-4 2025 CALIFORNIA RESIDENTIAL CODE
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CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE
APPENDIX BI – LIGHT STRAW-CLAY CONSTRUCTION
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
CRC § 1.5 Medium relevance — show source text
Adopting agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt entire chapter Adopt entire chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowX X X Chapter / Section R109.1.5 X X R109.1.5.1 X X R109.1.5.2 X R109.1.5.3 X R109.1.6 X X R109.1.6.1 X R109.1.6.2 X R109.2 - R109.4 X R110 - R110.4 X R111 - R111.3 X R113.1 - R113.2 X R114.1 - R114.4 X The state agency does not adopt sections identified with the following symbol: †
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PART I—ADMINISTRATIVE
1 ADMINISTRATION
DIVISION I CALIFORNIA ADMINISTRATION
SECTION 1.1—GENERAL
1.1.1 Title. These regulations shall be known as the California Residential Code, may be cited as such and will be referred to herein as “this code.” The California Residential Code is Part 2.5 of thirteen parts of the official compilation and publication of the adoption, amendment and repeal of building regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 International Residential Code of the International Code Council with necessary California amendments.
CFC § C104 Medium relevance — show source text
C103.3 Maximum spacing. The maximum spacing between fire hydrants shall be in accordance with Table C102.1.
SECTION C104—CONSIDERATION OF EXISTING FIRE HYDRANTS
C104.1 Existing fire hydrants. Existing fire hydrants on public streets are allowed to be considered as available to meet the requirements of Sections C102 and C103. Existing fire hydrants on adjacent properties are allowed to be considered as available to meet the requirements of Sections C102 and C103 provided that a fire apparatus access road extends between properties and that an easement is established to prevent obstruction of such roads.
SECTION C105—REFERENCED STANDARD
C105.1 General. See Table C105.1 for standards that are referenced in various sections of this appendix. Standards are listed by the standard identification with the effective date, standard title, and the section or sections of this appendix that reference the standard.
TABLE C105.1—REFERENCED STANDARDS Col2 Col3 STANDARD ACRONYM STANDARD NAME SECTIONS HEREIN REFERENCED CRC—25 California Residential Code Table C102.1 APPENDIX C-4 2025 CALIFORNIA FIRE CODE
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CALIFORNIA FIRE CODE – MATRIX ADOPTION TABLE
APPENDIX CC – FIRE HYDRANT LOCATIONS AND DISTRIBUTION
(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-
CGSFM Col5 HCD Col7 Col8 DSA Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGT-24 T-19* 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt Entire Chapter X Adopt Entire Chapter as
amended (amended sections
listed below)Adopt only those sections that
are listed below[California Code of Regulations,
Title 19, Division 1]Chapter / Section - The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same.
CRC § 2.6 Medium relevance — show source text
BK109.1 Thermal characteristics. Cob walls shall be classified as mass walls in accordance with Section N1102.2.6 and shall meet the R -value requirements for mass walls in Table N1102.1.3. BK109.2 Thermal resistance. The unit R -value for cob walls with a density of 110 pounds per cubic foot (1762 kg/m [3] ) shall be R-0.22 (RSI 0.0387) per inch of cob thickness. The unit R -value for cob walls with a density of 75 pounds per cubic foot (1201 kg/m [3] ) shall be R-0.54 (RSI 0.095) per inch of cob thickness. Linear interpolation is permitted. Extrapolation is not permitted. Walls that vary in thickness along their height or length shall use the average thickness of the wall to determine its R -value. The thermal resistance values of air films and finish materials or additional insulation shall be added to the cob wall’s thermal resistance value to determine the Rvalue of the wall assembly. Cob density shall be measured at equilibrium moisture content.
BK109.3 Additional insulation. Where insulating materials are added to the face of a cob wall, the combination of additional insulation and any associated connecting, weather-resisting or protective materials shall comply with Section BK104.1.2, Items 1 through 4.
SECTION BK110—REFERENCED STANDARDS
BK110.1 General. See Table BK110.1 for standards that are referenced in various sections of this appendix. Standards are listed by the standard identification with the effective date, the standard title and the section or sections of this appendix that reference the standard.
TABLE BK110.1—REFERENCED STANDARDS Col2 Col3 STANDARD
ACRONYMSTANDARD NAME SECTIONS
HEREIN REFERENCEDASTM C5—10 Standard Specification for Quicklime for Structural Purposes BK104.4.6 ASTM C141/C141M—14 Standard Specification for Hydrated Hydraulic Lime for Structural Purposes BK104.4.6 ASTM C206—14 Standard Specification for Finishing Hydrated Lime BK104.4.6 ASTM C926—21 Specification for Appliance of Portland Cement-Based Plaster BK104.4.8 ASTM C1707—11 Standard Specification for Pozzolanic Hydraulic Lime for Structural Purposes BK104.4.6 ASTM E2392/E2392M—10(2016) Standard Guide for Design of Earthen Wall Building Systems BK104.4.3.2 ASTM BS1, ASTM BS EN 459—15 Building Lime—Part 1: Definitions, Specifications and Conformity Criteria;
Part 2: Test MethodsBK104.4.6 APPENDIX BK-18 2025 CALIFORNIA RESIDENTIAL CODE
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CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE APPENDIX BL – HEMP-LIME (HEMPCRETE) CONSTRUCTION
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
CRC § 1.11.5 Medium relevance — show source text
1.11.5 Inspections. Work performed subject to the provisions of this code shall comply with the inspection requirements of Sections R109.1 through R109.1.6.
1.11.5.1 Existing Group I -1 or R occupancies. Licensed 24-hour care in a Group I-1 or R occupancy in existence and originally classi- fied under previously adopted state codes shall be reinspected under the appropriate previous code, provided there is no change in the use or character which would place the facility in a different occupancy group.
1.11.6 Certificate of occupancy. A certificate of occupancy shall be issued as specified in Section R110.
1.11.7 Temporary structures and uses. See Section R107.
1.11.8 Service utilities. See Section R111.
1.11.9 Stop work order. See Section R114.
1.11.10 Unsafe buildings, structures and equipment. See Title 24, Part 2, California Building Code, Section 115.
1.11.11 Adopting agency identification. The provisions of this code applicable to buildings identified in this Section 1.11 will be identi- fied in the Matrix Adoption Tables under the acronym SFM.
SECTION 1.12—RESERVED
SECTION 1.13—RESERVED
SECTION 1.14—RESERVED
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1-16 2025 CALIFORNIA RESIDENTIAL CODE
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DIVISION II SCOPE AND ADMINISTRATION
User notes:
About this chapter: Chapter 1 Division II establishes the limits of applicability of this code and describes how the code is to be applied and enforced. Chapter 1 Division II is in two parts: Part 1—Scope and Application (Sections R101–R102) and Part 2—Administration and Enforcement (Sections R103–R114). Section R101 identifies which buildings and structures come under its purview and references other I-Codes as applicable. Standards and codes are scoped to the extent referenced (see Section R102.4).
The one- and two-family dwelling code is intended to be adopted as a legally enforceable document, and it cannot be effective without adequate provisions for its administration and enforcement. The provisions of Chapter 1 establish the authority and duties of the building official appointed by the authority having jurisdiction and also establish the rights and privileges of the design professional, contractor and property owner.
Division II is not adopted by the Department of Housing and Community Development except where specifically indicated. Note: Specific sections of Chapter 1, Division II adopted by the State Fire Marshal will be indicated in the Matrix Adoption Table.
PART 1—SCOPE AND APPLICATION
SECTION R101—SCOPE AND GENERAL REQUIREMENTS
R101.1 Title. These provisions shall be known as the Residential Code for One- and Two-family Dwellings of [ NAME OF JURISDICTION ], and shall be cited as such and will be referred to herein as “this code.”
CRC § 1.3. Medium relevance — show source text
APPENDIX BI — LIGHT STRAW-CLAY CONSTRUCTION
ments for mass walls in Table N1102.1.3. Walls with light straw-clay infill of densities less than 20 pounds per cubic foot (480.6 kg/m [3] ) shall meet the R-value requirements for wood frame walls in Table N1102.1.3.
BI104.2 Thermal resistance. Light straw-clay shall be deemed to have a thermal resistance as specified in Table BI103.2.3.
SECTION BI105—REFERENCED STANDARDS
BI105.1 General. See Table BI105.1 for standards that are referenced in various section of this appendix. Standards are listed by the standard identification with the effective date, the standard title, and the section or sections of this appendix that reference this standard.
TABLE BI105.1—REFERENCED STANDARDS Col2 Col3 STANDARD ACRONYM STANDARD NAME SECTIONS HEREIN REFERENCED ASTM E2392/E2392M—10(2016) Standard Guide for Design of Earthen Wall Building Systems Table BI103.2.3 2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BI-7
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APPENDIX BI-8 2025 CALIFORNIA RESIDENTIAL CODE
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CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE
APPENDIX BJ – STRAWBALE CONSTRUCTION
(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-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt entire chapter X Adopt entire chapter as
amended (amended
sections listed below)X Adopt only those sections
that are listed belowX Chapter / Section BJ Note X BJ 107 X 2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BJ-1
Frequently asked questions
Are referenced standards mandatory wherever they appear in the CRC?
Yes — when the CRC text cites a standard, that standard (and the edition shown) is part of the code to the prescribed extent of the reference; check Chapter 44 and the citing section for scope.
What if a referenced standard is newer than the edition listed in Chapter 44?
You must use the edition/effective date the CRC lists in Chapter 44 unless the CRC explicitly states otherwise. Chapter 44 shows the adopted edition.
If a product is UL-listed but the CRC says something different, which controls?
If enforcing the CRC would violate the listing or its conditions, the listing and manufacturer’s instructions control (the R102.4 exception). Otherwise, the CRC controls where it conflicts with the referenced standard.
Where do I check which sections reference a particular standard?
Use Chapter 44 — Referenced Standards; it lists each standard, its edition/effective date and every CRC section that cites it.
Do appendix-referenced standards apply statewide?
Only if that appendix (or its sections) is adopted by the authority having jurisdiction. Appendices and matrix-adoption notes show which agencies adopt which appendices.
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