CRSC · California Referenced Standards Code
Who may grant variances or exceptions to these standards?
If a shielding standard from CRSC **§ 12-31C-101** needs to be changed for your X‑ray room, only the California Department of Health Services can grant that variance — local building officials enforce the rules but may not approve exceptions.
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
The California Referenced Standards Code requires that all radiation shielding barriers for healing‑arts X‑ray and related installations comply with the NCRP shielding reports specified in § 12-31C-101. The CRSC assigns authority to the Department of Health Services as the entity responsible for these shielding standards; the Department is the only agency that may issue variances or exceptions to those standards. See § 12-31C-101 for the mandatory referenced reports and the Department designation.
The single controlling rule: Only the Department of Health Services may grant a variance or exception to the radiation shielding standards called out in § 12-31C-101.
Requirements in detail
Who has authority
- Authority: The Department of Health Services (state level) is the exclusive authority to grant variances/exceptions to the radiation shielding standards called out in § 12-31C-101.
- This exclusive designation is also restated in the California Building Code Chapter 31C (Radiation): § 3102C says that radiation shielding barriers must meet the CRSC standard and that the Department is the only agency that may grant a variance or exception.
What standards cannot be varied except by the Department
- Standards referenced: The mandatory guidance materials that the Department enforces are the National Council on Radiation Protection and Measurements reports listed in § 12-31C-101:
- Report No. 35 — Dental X‑Ray Protection;
- Report No. 49 — Structural Shielding Design and Evaluation for Medical Use of X‑rays and Gamma Rays up to 10 MeV;
- Report No. 51 — Radiation Protection Design Guidelines for 0.1–100 MeV Particle Accelerator Facilities.
Scope & applicability
- Scope: Applies to all radiation shielding barriers in rooms and enclosures housing radiation machines used in healing‑arts X‑ray, medical and accelerator facilities as set out in § 12-31C-101.
- Practical effect: Local building departments, plan checkers, and other state agencies may enforce compliance with the referenced standards but may not independently grant exceptions to the CRSC shielding requirements — only the Department of Health Services may do so. The California Building Code reiterates the Department’s exclusive authority in § 3102C.
What the code text does — and does not — specify
- The CRSC specifies the required reference reports and the authorizing agency (Department of Health Services) in § 12-31C-101. It does not include procedural details (filing format, timelines, documentation checklist, fees) for a variance application in the text of § 12-31C-101. If you need procedural steps, you must consult the Department’s own regulations or contact the Department directly.
Decision‑relevant dimensions (quick reference)
| Decision dimension | Typical values / examples | Who decides | Code Reference |
|---|---|---|---|
| Which standards apply | NCRP Reports No. 35, 49, 51 (mandatory) | Enforcing agency applies; only Dept. of Health Services may grant exceptions | § 12-31C-101 |
| Who may grant a variance or exception | Only the Department of Health Services (state) | Department of Health Services | § 12-31C-101; California Building Code § 3102C |
| Subject matter of variance | Radiation shielding barriers for rooms/enclosures with radiation machines | Department of Health Services | § 12-31C-101 |
| Local enforcement vs. authority to vary | Local AHJ enforces; cannot substitute own variance authority | Local AHJ (enforcement); Dept. of Health Services (variance) | § 12-31C-101; § 3102C |
Exceptions & special cases
- The CRSC text itself establishes no internal exception to the rule that NCRP Reports are mandatory and that the Department of Health Services is the only agency that may grant variances to those shielding standards. The mandatory reference is explicit in § 12-31C-101.
- The California Building Code (Chapter 31C) reinforces that the Department is the sole variance authority for shielding standards in building applications (see § 3102C). If a local plan check or AHJ appears to allow a different variance process for these specific shielding standards, that is contrary to the CRSC/CBC direction and should be escalated to the Department for clarification.
- If a facility has unique circumstances (historic building, unusual accelerator configuration, state‑operated facility), that does not change who may issue a variance — the Department remains the sole authority — but those circumstances are precisely the kinds of facts the Department will consider when evaluating an exception request. The CRSC does not list the Department’s evaluation criteria in § 12-31C-101; consult the Department for its application requirements.
Common mistakes
- Assuming the local building official can approve a deviation to the NCRP shielding requirements: wrong — only the Department of Health Services may grant exceptions to the standards cited in § 12-31C-101.
- Treating the CRSC reference reports as optional guidance: the CRSC makes them mandatory for shielding barriers referenced in § 12-31C-101.
- Confusing enforcement vs. variance authority: local AHJs enforce compliance but do not have the power to issue exceptions to the CRSC shielding standards — that power is expressly assigned to the Department (see § 12-31C-101 and CBC § 3102C).
- Expecting the CRSC to give step‑by‑step variance procedures: § 12-31C-101 does not supply application forms, timelines, or internal review criteria — contact the Department for procedural rules.
Worked example — how the rule applies (illustrative)
Note: the CRSC text (§ 12-31C-101) defines the standards and the approving agency but does not provide procedural steps or numeric barrier values. The numerical shielding calculations themselves must follow the NCRP reports cited in § 12-31C-101; the example below is an administrative illustration only.
Scenario (illustrative):
- A private dental clinic installs a new X‑ray room and a consulting physicist’s calculations (per NCRP Report No. 35) indicate the existing wall lead is 1 layer short of the calculated requirement.
- The clinic seeks an exception rather than reconstructing the wall immediately. Steps (illustrative):
- Prepare one dossier containing: (a) the equipment specifications; (b) the full shielding calculation following the applicable NCRP report; (c) floor plans and room elevations; and (d) any operational controls or administrative mitigations proposed. (Example package count: 4 documents.)
- Submit the dossier to the Department of Health Services — because only that Department can grant a variance to the standards cited in § 12-31C-101.
- The Department reviews the NCRP‑based calculations and may: (a) deny the request; (b) approve a time‑limited or conditioned variance (for example, requiring administrative controls or a timeline for upgrade); or (c) require full compliance. (Which option is chosen is a Department decision; the CRSC does not prescribe criteria or timelines in § 12-31C-101.)
If you need to pursue a variance, treat the above steps as a high‑level checklist and contact the Department of Health Services for the Department’s exact submission requirements and any forms or processing timelines.
Related provisions
- § 12-31C-101 — All healing‑arts X‑ray shielding standards; mandatory NCRP reports; Department of Health Services authority.
- California Building Code § 3102C — Reiterates that radiation shielding barriers must meet § 12-31C-101 and that the Department of Health Services is the only agency that may grant a variance or exception to those standards.
(Note: if you need other related CRSC sections beyond § 12-31C-101, the CRSC excerpts available here do not show additional numbered 12‑31C sections; consult the full Part 12 CRSC or the Department for further adjacent standards.)
Code references
Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:
California Referenced Standards Code High relevance — show source text
G106.5 Restrictions. The board shall not issue a variance for any proposed development in a floodway if any increase in flood levels would result during the base flood discharge.
G106.6 Considerations. In reviewing applications for variances, the board shall consider all technical evaluations, all relevant factors, all other portions of this appendix and the following:
The danger that materials and debris may be swept onto other lands resulting in further injury or damage.
The danger to life and property due to flooding or erosion damage.
The susceptibility of the proposed development, including contents, to flood damage and the effect of such damage on current and future owners.
The importance of the services provided by the proposed development to the community.
The availability of alternate locations for the proposed development that are not subject to flooding or erosion.
The compatibility of the proposed development with existing and anticipated development.
The relationship of the proposed development to the comprehensive plan and flood plain management program for that area.
The safety of access to the property in times of flood for ordinary and emergency vehicles.
The expected heights, velocity, duration, rate of rise and debris and sediment transport of the floodwaters and the effects of wave action, if applicable, expected at the site.
The costs of providing governmental services during and after flood conditions including maintenance and repair of public utilities and facilities such as sewer, gas, electrical and water systems, streets and bridges.
G106.7 Conditions for issuance. Variances shall only be issued by the board where all of the following criteria are met:
A technical showing of good and sufficient cause that the unique characteristics of the size, configuration or topography of the site renders the elevation standards inappropriate.
A determination that failure to grant the variance would result in exceptional hardship by rendering the lot undevelopable.
A determination that the granting of a variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, nor create nuisances, cause fraud on or victimization of the public or conflict with existing local laws or ordinances.
A determination that the variance is the minimum necessary, considering the flood hazard, to afford relief.
Notification to the applicant in writing over the signature of the floodplain administrator that the issuance of a variance to construct a structure below the base flood level will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage, and that such construction below the base flood level increases risks to life and property.
SECTION G107—SUBDIVISIONS
G107.1 General. Any subdivision proposal, including proposals for manufactured home parks and subdivisions, or other proposed new development in a flood hazard area shall be reviewed to verify all of the following:
- Such proposals are consistent with the need to minimize flood damage.
- Public utilities and facilities, such as sewer, gas, electric and water systems, are located and constructed to minimize or eliminate flood damage.
- Adequate drainage is provided to reduce exposure to flood hazards.
CBC § G107 High relevance — show source text
- The costs of providing governmental services during and after flood conditions including maintenance and repair of public utilities and facilities such as sewer, gas, electrical and water systems, streets and bridges.
G106.7 Conditions for issuance. Variances shall only be issued by the board where all of the following criteria are met:
A technical showing of good and sufficient cause that the unique characteristics of the size, configuration or topography of the site renders the elevation standards inappropriate.
A determination that failure to grant the variance would result in exceptional hardship by rendering the lot undevelopable.
A determination that the granting of a variance will not result in increased flood heights, additional threats to public safety, extraordinary public expense, nor create nuisances, cause fraud on or victimization of the public or conflict with existing local laws or ordinances.
A determination that the variance is the minimum necessary, considering the flood hazard, to afford relief.
Notification to the applicant in writing over the signature of the floodplain administrator that the issuance of a variance to construct a structure below the base flood level will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage, and that such construction below the base flood level increases risks to life and property.
SECTION G107—SUBDIVISIONS
G107.1 General. Any subdivision proposal, including proposals for manufactured home parks and subdivisions, or other proposed new development in a flood hazard area shall be reviewed to verify all of the following:
- Such proposals are consistent with the need to minimize flood damage.
- Public utilities and facilities, such as sewer, gas, electric and water systems, are located and constructed to minimize or eliminate flood damage.
- Adequate drainage is provided to reduce exposure to flood hazards.
G107.2 Subdivision requirements. The following requirements shall apply in the case of any proposed subdivision, including proposals for manufactured home parks and subdivisions, any portion of which lies within a flood hazard area:
- The flood hazard area, including floodways, coastal high-hazard areas and coastal A zones, as appropriate, shall be delineated on tentative and final subdivision plats.
- Design flood elevations shall be shown on tentative and final subdivision plats.
- Residential building lots shall be provided with adequate buildable area outside the floodway.
- The design criteria for utilities and facilities set forth in this appendix and appropriate International Codes shall be met.
2025 CALIFORNIA BUILDING CODE APPENDIX G-5
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX G—FLOOD-RESISTANT CONSTRUCTION
SECTION G108—SITE IMPROVEMENT
G108.1 Development in floodways. Development or land-disturbing activity shall not be authorized in the floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice, and prepared by a registered design professional, that the proposed encroachment will not result in any increase in the base flood level.
G108.2 Coastal high-hazard areas and coastal A zones. In coastal high-hazard areas and coastal A zones:
New buildings and buildings that are substantially improved shall only be authorized landward of the reach of mean high tide.
The use of fill for structural support of buildings is prohibited.
CRSC § 1.11. High relevance — show source text
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.
2025 CALIFORNIA BUILDING CODE 31C-1
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31C-2 2025 CALIFORNIA BUILDING CODE
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31C [DPH] RADIATION
SECTION 3101C—SCOPE
For the purpose of this chapter, the following terms shall have the meaning indicated:
PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.
SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.
STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.
USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.
SECTION 3102C—RADIATION SHIELDING BARRIERS
All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.
SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS
3103C.1 Operator station. The operator’s station at the control shall be behind a protective barrier either in a separate room, in a protected booth or behind a shield which will intercept the useful beam and any radiation which has been scattered only once.
3103C.2 Patient observation and communication. Provision shall be made for the operator to observe and communicate with the patient without leaving the shielded position at the control panel. When an observation window is used, it must provide radiation atten- uation equal to that required in the surrounding barrier.
SECTION 3104C—MEDICAL THERAPEUTIC X-RAY INSTALLATIONS
3104C.1 General. All wall, floor and ceiling areas that can be struck by the useful beam, plus a border of 1 foot (305 mm), shall be provided with primary protective barriers.
3104C.2 Equipment operating above 50 kVp. Equipment operating above 50 kVp shall conform with the following: 1. The control station shielding shall either be an integral part of the building or anchored to the building. 2. The control station shall be provided with a window having radiation attenuation equal to that required by the adjacent barrier, or a mirror system, or a closed-circuit television viewing screen. The patient area must be visible to the operator with- out having to leave the protected area during exposure.
CRSC § 1.11. High relevance — show source text
CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE
CHAPTER 31C – RADIATION
(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 Col17 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 6 6 6 6 6 6 6 6 6 Adopt entire chapter X Adopt entire chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowChapter / Section 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.
2025 CALIFORNIA BUILDING CODE 31C-1
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31C-2 2025 CALIFORNIA BUILDING CODE
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31C [DPH] RADIATION
SECTION 3101C—SCOPE
For the purpose of this chapter, the following terms shall have the meaning indicated:
PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.
SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.
STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.
USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.
SECTION 3102C—RADIATION SHIELDING BARRIERS
All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.
SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS
CRSC § 1612.1 High relevance — show source text
G105.3 Validity of permit. The issuance of a permit under this appendix shall not be construed to be a permit for, or approval of, any violation of this appendix or any other ordinance of the jurisdiction. The issuance of a permit based on submitted documents and information shall not prevent the floodplain administrator from requiring the correction of errors. The floodplain administrator is authorized to prevent occupancy or use of a structure or site that is in violation of this appendix or other ordinances of this jurisdiction.
G105.4 Expiration. A permit shall become invalid if the proposed development is not commenced within 180 days after its issuance, or if the work authorized is suspended or abandoned for a period of 180 days after the work commences. Extensions shall be requested in writing and justifiable cause demonstrated. The floodplain administrator is authorized to grant, in writing, one or more extensions of time, for periods not more than 180 days each.
G105.5 Suspension or revocation. The floodplain administrator is authorized to suspend or revoke a permit issued under this appendix wherever the permit is issued in error or on the basis of incorrect, inaccurate or incomplete information, or in violation of any ordinance or code of this jurisdiction.
SECTION G106—VARIANCES
G106.1 General. The board of appeals established pursuant to Section 113, or other established or designed board, shall hear and decide requests for variances. The board shall base its determination on technical justifications, and has the right to attach such conditions to variances as it deems necessary to further the purposes and objectives of this appendix and Section 1612.
G106.2 Records. The floodplain administrator shall maintain a permanent record of all variance actions, including justification for their issuance.
APPENDIX G-4 2025 CALIFORNIA BUILDING CODE
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APPENDIX G—FLOOD-RESISTANT CONSTRUCTION
G106.3 Historic structures. A variance is authorized to be issued for the repair or rehabilitation of a historic structure upon a determination that the proposed repair or rehabilitation will not preclude the structure’s continued designation as a historic structure, and the variance is the minimum necessary to preserve the historic character and design of the structure.
Exception: Within flood hazard areas, historic structures that do not meet one or more of the following designations:
- Listed or preliminarily determined to be eligible for listing in the National Register of Historic Places.
- Determined by the Secretary of the U.S. Department of Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined to qualify as an historic district.
- Designated as historic under a state or local historic preservation program that is approved by the Department of Interior.
G106.4 Functionally dependent facilities. A variance is authorized to be issued for the construction or substantial improvement of a functionally dependent facility provided that the criteria in Section 1612.1 are met and the variance is the minimum necessary to allow the construction or substantial improvement, and that all due consideration has been given to methods and materials that minimize flood damages during the design flood and do not create additional threats to public safety.
G106.5 Restrictions. The board shall not issue a variance for any proposed development in a floodway if any increase in flood levels would result during the base flood discharge.
CRSC § 1612.3.1 High relevance — show source text
G104.10 Use of changed technical data. The floodplain administrator and the applicant shall not use changed flood hazard area boundaries or base flood elevations for proposed buildings or developments unless the floodplain administrator or applicant has applied for a conditional Flood Insurance Rate Map (FIRM) revision and has received the approval of the Federal Emergency Management Agency (FEMA).
SECTION G105—PERMITS
G105.1 Required. Any person, owner or owner’s authorized agent who intends to conduct any development in a flood hazard area shall first make application to the floodplain administrator and shall obtain the required permit.
G105.2 Application for permit. The applicant shall file an application in writing on a form furnished by the floodplain administrator. Such application shall:
Identify and describe the development to be covered by the permit.
Describe the land on which the proposed development is to be conducted by legal description, street address or similar description that will readily identify and definitely locate the site.
Include a site plan showing the delineation of flood hazard areas, floodway boundaries, flood zones, design flood elevations, ground elevations, proposed fill and excavation and drainage patterns and facilities.
Include in subdivision proposals and other proposed developments with more than 50 lots or larger than 5 acres (20 234 m [2] ), base flood elevation data in accordance with Section 1612.3.1 if such data are not identified for the flood hazard areas estab lished in Section G103.2.
Indicate the use and occupancy for which the proposed development is intended.
Be accompanied by construction documents, grading and filling plans and other information deemed appropriate by the floodplain administrator.
State the valuation of the proposed work.
Be signed by the applicant or the applicant’s authorized agent.
G105.3 Validity of permit. The issuance of a permit under this appendix shall not be construed to be a permit for, or approval of, any violation of this appendix or any other ordinance of the jurisdiction. The issuance of a permit based on submitted documents and information shall not prevent the floodplain administrator from requiring the correction of errors. The floodplain administrator is authorized to prevent occupancy or use of a structure or site that is in violation of this appendix or other ordinances of this jurisdiction.
G105.4 Expiration. A permit shall become invalid if the proposed development is not commenced within 180 days after its issuance, or if the work authorized is suspended or abandoned for a period of 180 days after the work commences. Extensions shall be requested in writing and justifiable cause demonstrated. The floodplain administrator is authorized to grant, in writing, one or more extensions of time, for periods not more than 180 days each.
G105.5 Suspension or revocation. The floodplain administrator is authorized to suspend or revoke a permit issued under this appendix wherever the permit is issued in error or on the basis of incorrect, inaccurate or incomplete information, or in violation of any ordinance or code of this jurisdiction.
SECTION G106—VARIANCES
G106.1 General. The board of appeals established pursuant to Section 113, or other established or designed board, shall hear and decide requests for variances. The board shall base its determination on technical justifications, and has the right to attach such conditions to variances as it deems necessary to further the purposes and objectives of this appendix and Section 1612.
G106.2 Records. The floodplain administrator shall maintain a permanent record of all variance actions, including justification for their issuance.
CRSC § 0.42 Medium relevance — show source text
Fastener spacing applies where wood exterior soffit framing member-specific gravity is 0.42 or larger. Where the specific gravity of exterior soffit framing members is greater
than or equal to 0.35 but less than 0.42 in accordance with AWC NDS, the fastener spacing shall be multiplied by 0.67 or the same fastener spacing as prescribed for galvanized
steel nails shall be permitted to be used where RSRS-01 (2-inch by 0.099-inch by 0.266-inch head) nails replace 6d box nails and RSRS-03 (21/2-inch × 0.131-inch × 0.281-inch
head) nails replace 8d common nails or 10d box nails. RSRS is a Roof Sheathing Ring Shank nail meeting the specifications in ASTM F1667. Framing members shall be mini-
mum 2 × 3 nominal with the larger dimension in the cross section aligning with the length of fasteners to provide sufficient embedment depths.
f. Spacing at intermediate supports shall be not greater than 12 inches on center.|For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Fasteners shall comply with Sections R703.3.2 and R703.3.3.
b. Maximum spacing of exterior soffit framing members shall not exceed 24 inches.
c. Wood structural panels shall be of an exterior exposure grade.
d. Wood structural panels shall be installed with strength axis perpendicular to supports with not fewer than two continuous spans.
e. Fastener spacing applies where wood exterior soffit framing member-specific gravity is 0.42 or larger. Where the specific gravity of exterior soffit framing members is greater
than or equal to 0.35 but less than 0.42 in accordance with AWC NDS, the fastener spacing shall be multiplied by 0.67 or the same fastener spacing as prescribed for galvanized
steel nails shall be permitted to be used where RSRS-01 (2-inch by 0.099-inch by 0.266-inch head) nails replace 6d box nails and RSRS-03 (21/2-inch × 0.131-inch × 0.281-inch
head) nails replace 8d common nails or 10d box nails. RSRS is a Roof Sheathing Ring Shank nail meeting the specifications in ASTM F1667. Framing members shall be mini-
mum 2 × 3 nominal with the larger dimension in the cross section aligning with the length of fasteners to provide sufficient embedment depths.
f. Spacing at intermediate supports shall be not greater than 12 inches on center.|For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
a. Fasteners shall comply with Sections R703.3.2 and R703.3.3.
b. Maximum spacing of exterior soffit framing members shall not exceed 24 inches.
c. Wood structural panels shall be of an exterior exposure grade.
d. Wood structural panels shall be installed with strength axis perpendicular to supports with not fewer than two continuous spans.
e. Fastener spacing applies where wood exterior soffit framing member-specific gravity is 0.42 or larger.California Referenced Standards Code Medium relevance — show source text
|100 psf|1 hr
23 min|||7|1, 2|11/3| |F/C-4-RC-9|4″|4″ deep (4370 psi);1/4″ reinforcement bars
at 6″ pitch with3/4″ cover;1/4″ main rein-
forcement bars at 4″ pitch perpendicular
with1/2″ cover; 13′1″ span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-10|4″|4″ thick (5140 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 5|11/4| |F/C-4-RC-11|4″|4″ thick (4000 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom of slab; 6′6″
span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-12|4″|4″ deep (2380 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom surface;
6′6″ span restrained.|150 psf|1 hr
3 min|||7|1, 2|1| |F/C-4-RC-13|41/2″|41/2″ thick (5200 psi) deck;1/4″ reinforce-
ment bars at 71/4″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-14|41/2″|41/2″ deep (2525 psi) concrete deck;1/4″
reinforcement bars at 71/2″ pitch with7/8″
cover;3/8″ main reinforcement bars at
33/8″ pitch perpendicular with1/2″ cover;
13′1″ span restrained.|150 psf|42 min|||7|1, 5|2/3| |F/C-4-RC-15|41/2″|41/2″ deep (4830 psi) concrete deck;
11/2″ × No.CRSC § 1.859 Medium relevance — show source text
78|–|1.859|0.463| |35.31|–|2.247|0.559| |38.84|–|2.667|0.663| |42.37|–|3.121|0.775| |45.90|–|3.607|0.895| |49.43|–|4.125|1.022| |52.97|–|–|1.157| |56.50|–|–|1.299| |60.03|–|–|1.449| |63.56|–|–|1.607| |67.09|–|–|1.772| |70.62|–|–|1.944| |81.21|–|–|2.503| |91.81|–|–|3.127| |102.40|–|–|3.813|
For SI units: 1 standard cubic foot per minute = 28.32 SLPM, 1 inch = 25 mm, 1 foot = 304.8 mm, 1 pound-force per square inch = 6.8947 kPa
Notes: 1 Based on pressure of 14.7 psig (101 kPa) at 68°F (20°C). 2 Based on pressure of 55 psig (379 kPa) at 68°F (20 °C).
2025 CALIFORNIA PLUMBING CODE 291
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HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICAL VACUUM SYSTEMS
TABLE 1323.1.4(5) PRESSURE LOSS FOR VACUUM (continued)
FLOW
RATE
(SCFM)1VACUUM LOSS (inch of mercury)
PER 100 FEET FOR COPPER TUBE2Col3 Col4 Col5 Col6 FLOW
RATE
(SCFM)13⁄4 INCH
TUBE1 INCH
TUBE11⁄4 INCH
TUBE11⁄2 INCH
TUBE2 INCH
TUBE49.43 – – – 3.645 0.956 52.97 – – – 4.122 1.081 56.50 – – – 4.626 1.212 63.56 – – – – 1.495 70.62 – – – – 1.803 77.68 – – – – 2.138 84.74 – – – – 2.497 91.81 – – – – 2.882 98.87 – – – – 3.291 105.93 – – – – 3.724 112.99 – – – – 4.181 CFC § J102 Medium relevance — show source text
to:
- Impact-resistant drywall.
- Impact-resistant glazing, such as blast or hurricane-type glass.
- All types of roof and floor structural members including but not limited to post-tension concrete, bar joists, solid wood joists, rafters, trusses, cold-formed galvanized steel, I-joists and I-beams; green roof with vegetation, soil and plants.
- Hazardous materials (such as explosives, chemicals, plastics).
- Solar panels and DC electrical energy.
- HVAC system; and smoke management system for pressurization and exhaust methods.
- Other unique characteristic(s) within the building that are ranked according to a potential risk to occupants and firefighters.
J101.8 Sign classification maintenance, building information. Sign maintenance shall comply with each of the following:
- Fire departments in the jurisdiction shall define the designations to be placed within the sign.
- Fire departments in the jurisdiction shall conduct annual inspections to verify compliance with this section of the code and shall notify the owner, or the owner’s agent, of any required updates to the sign in accordance with fire department designations and the owner, or the owner’s agent, shall comply within 30 days.
- The owner of a building shall be responsible for the maintenance and updates to the sign in accordance with fire department designations.
J101.9 Training. Jurisdictions shall train fire department personnel on Sections J101.1 through J101.8.
SECTION J102—REFERENCED STANDARDS
J102.1 General. See Table J102.1 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 J102.1—REFERENCED STANDARDS Col2 Col3 STANDARD ACRONYM STANDARD NAME SECTIONS HEREIN REFERENCED CBC—25 California Building Code J101.3, J101.5 NFPA 13—22 Installation of Sprinkler Systems J101.6 2025 CALIFORNIA FIRE CODE APPENDIX J-5
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APPENDIX J-6 2025 CALIFORNIA FIRE CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
CALIFORNIA FIRE CODE – MATRIX ADOPTION TABLE
APPENDIX K – CONSTRUCTION REQUIREMENTS FOR EXISTING AMBULATORY CARE FACILITIES
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
(Not adopted by the State Fire Marshal)
CRSC § 405.5.3 Medium relevance — show source text
405.5.3,_
A5.405.5.3.2||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Concrete manufacture, High strength concrete|A5.405.5.3,
A5.405.5.3.3||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Concrete manufacture, Later ages of maturity|A5.405.5.3,
A5.405.5.3.4||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Concrete manufacture, Returned fresh concrete|A5.405.5.3,
A5.405.5.3.5||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Choice of materials|A5.406.1, A5.406.1.1,
A5.406.1.2,
A5.406.1.3||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Life cycle assessment: Scope with exceptions, Whole
building life cycle assessment, Tier 1 with Exception, Veri-
fication of compliance|A5.409.1, A5.409.2,
A5.409.2.1,
A5.409.2.3||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Life cycle assessment: Scope with exceptions, Product
GWP compliance – prescriptive path with Exception and
Exception Equation, Verification of compliance, Product
GWP Limits Tier 1 Table with footnotes|A5.409.1, A5.409.3,
A5.409.3.1,
A5.409.3.2,
Table A5.409.3||||| |(continued)
DIVISION 5.4
Material
Conserva-
tion and
Resource
Efficiency|Select One Elective|Elective|Whole building life cycle assessment of additional
impacts, Impacts to be considered|_A5.409.4, A5.409.4.CRSC § 1014.3.6 Medium relevance — show source text
1014.3.6, shall be installed in accordance with the manufacturer’s installation instructions to receive the drainage from fixtures or equipment that produce grease-laden waste. Grease-laden waste fixtures shall include, but not be limited to, sinks and drains, such as floor drains, floor sinks, and other fixtures or equipment in serving establishments, such as restaurants, cafes, lunch counters, cafeterias, bars and clubs, hotels, hospitals, sanitariums, factory or school kitchens, or other establishments where grease is introduced into the drainage or sewage system in quantities that can effect line stoppage or hinder sewage treatment or private sewage disposal systems. A combination of hydromechanical, gravity grease interceptors and engineered systems shall be allowed to meet this code and other applicable requirements of the Authority Having Jurisdiction where space or existing physical constraints of existing buildings necessitate such installations. A grease interceptor shall not be required for individual dwelling units or private living quarters. Water closets, urinals, and other plumbing fixtures conveying human waste shall not drain into or through the grease interceptor.
1014.1A [OSHPD 1, 1R, 2, 3, 4 & 5] The Authority Having Jurisdiction is the individual official, board, department or agency authorized to administer and enforce the sewage treatment system in the area of the location of the health facil- ity.
1014.1B [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors shall not be installed in food preparation area of the kitchens.
1014.1C [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors shall be installed outside of the kitchen area in location affording ease of maintenance and servicing.
2025 CALIFORNIA PLUMBING CODE 197
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TRAPS AND INTERCEPTORS
1014.1.1 Trapped and Vented. Each fixture discharging into a grease interceptor shall be individually trapped and vented in an approved manner.
1014.1.2 Maintenance. Grease interceptors shall be maintained in efficient operating condition by periodic removal of the accumulated grease and latent material. No such collected grease shall be introduced into drainage piping or a public or private sewer. Where the Authority Having Jurisdiction determines that a grease interceptor is not being properly cleaned or maintained, the Authority Having Jurisdiction shall have the authority to mandate the installation of additional equipment or devices and to mandate a maintenance program.
1014.1.3 Food Waste Disposers and Dishwash- ers. No food waste disposer or dishwasher shall be connected to or discharge into a grease interceptor. Commercial food waste disposers shall be permitted to discharge directly into the building’s drainage system.
Exception: Food waste disposers shall be permitted to discharge to grease interceptors that are designed to receive the discharge of food waste.
1014.2 Hydromechanical Grease Interceptors. Plumbing fixtures or equipment connected to a Type A and B hydromechanical grease interceptor shall discharge through an approved type of vented flow control installed in a readily accessible and visible location. Flow control devices shall be
CRSC § 1612.1 Medium relevance — show source text
G106.2 Records. The floodplain administrator shall maintain a permanent record of all variance actions, including justification for their issuance.
APPENDIX G-4 2025 CALIFORNIA BUILDING CODE
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APPENDIX G—FLOOD-RESISTANT CONSTRUCTION
G106.3 Historic structures. A variance is authorized to be issued for the repair or rehabilitation of a historic structure upon a determination that the proposed repair or rehabilitation will not preclude the structure’s continued designation as a historic structure, and the variance is the minimum necessary to preserve the historic character and design of the structure.
Exception: Within flood hazard areas, historic structures that do not meet one or more of the following designations:
- Listed or preliminarily determined to be eligible for listing in the National Register of Historic Places.
- Determined by the Secretary of the U.S. Department of Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined to qualify as an historic district.
- Designated as historic under a state or local historic preservation program that is approved by the Department of Interior.
G106.4 Functionally dependent facilities. A variance is authorized to be issued for the construction or substantial improvement of a functionally dependent facility provided that the criteria in Section 1612.1 are met and the variance is the minimum necessary to allow the construction or substantial improvement, and that all due consideration has been given to methods and materials that minimize flood damages during the design flood and do not create additional threats to public safety.
G106.5 Restrictions. The board shall not issue a variance for any proposed development in a floodway if any increase in flood levels would result during the base flood discharge.
G106.6 Considerations. In reviewing applications for variances, the board shall consider all technical evaluations, all relevant factors, all other portions of this appendix and the following:
The danger that materials and debris may be swept onto other lands resulting in further injury or damage.
The danger to life and property due to flooding or erosion damage.
The susceptibility of the proposed development, including contents, to flood damage and the effect of such damage on current and future owners.
The importance of the services provided by the proposed development to the community.
The availability of alternate locations for the proposed development that are not subject to flooding or erosion.
The compatibility of the proposed development with existing and anticipated development.
The relationship of the proposed development to the comprehensive plan and flood plain management program for that area.
The safety of access to the property in times of flood for ordinary and emergency vehicles.
The expected heights, velocity, duration, rate of rise and debris and sediment transport of the floodwaters and the effects of wave action, if applicable, expected at the site.
The costs of providing governmental services during and after flood conditions including maintenance and repair of public utilities and facilities such as sewer, gas, electrical and water systems, streets and bridges.
CRSC § 5.105.2 Medium relevance — show source text
Exception: Combined addition(s) to existing building(s) of two times the area or more of the existing building(s) is not eligible to meet compliance with Section 5.105.2 or Section A5.105.2.
A5.409.2 Whole building life cycle assessment. Projects shall meet the minimum requirements of Section A5.409.2 for Tier 1 or Tier 2 compliance.
A5.409.2.1 Tier 1. Projects shall conduct a cradle-to-grave whole building life cycle assessment meeting the requirements of Section 5.409.2 and performed in accordance with ISO 14040 and 14044, excluding operating energy, demonstrating a minimum 15-percent reduction in global warming potential (GWP) as compared to a reference baseline building of similar size, function, complexity, type of construction, material specification, and location that meets the requirements of all parts of the California Building Standards Code currently in effect. Software used to conduct the whole building life cycle assessment, including reference baseline building, shall have a data set compliant with ISO 14044, and ISO 21930 or EN 15804, and the software shall conform to ISO 21931 and/or EN 15978. The software tools and data sets shall be the same for evaluation of both the baseline building and the proposed building.
Exception: For projects that include building reuse, the reference baseline building shall exclude the reused elements. The percent reduction in GWP shall be achieved through the design and construction of new project elements.
A5.409.2.2 Tier 2. Projects shall conduct a cradle-to-grave whole building life cycle assessment meeting the requirements of Section 5.409.2 and performed in accordance with ISO 14040 and ISO 14044, excluding operating energy, demonstrating a minimum 20-percent reduction in GWP as compared to a reference baseline building of similar size, function, complexity, type of construction, material specification, and location that meets the requirements of all parts of the California Building Standards Code currently in effect. Software used to conduct the whole building life cycle assessment, including reference baseline building, shall have a data set compliant with ISO 14044, and ISO 21930 or EN 15804, and the software shall conform to ISO 21931 and/or EN 15978. The software tools and data sets shall be the same for evaluation of both the baseline building and the proposed building.
Exception: For projects that include building reuse, the reference baseline building shall not be of new construction and shall retain existing materials. The percent reduction in GWP shall be achieved through the design and construction of new project elements.
A5.409.2.3 Verification of compliance. A summary of the GWP analysis produced by the software and Worksheet WS-7 signed by the design professional of record shall be provided in the construction documents as documentation of compliance. A copy of the whole building life cycle assessment which includes the GWP analysis produced by the software, in addition to maintenance and training information, shall be included in the operation and maintenance manual and shall be provided to the owner at the close of construction. The enforcing agency may require inspection and inspection reports in accordance with Sections 702.2 and 703.1 during and at completion of construction to demonstrate substantial conformance. Inspection shall be performed by the design professional of record or third party acceptable to the enforcing agency.
A5.409.3 Product GWP compliance—prescriptive path. Each product that is permanently installed and listed in Table A5.409.3 shall have a Type III environmental product declaration (EPD), either product-specific or factory-specific.
CRSC § 2607.4 Medium relevance — show source text
Exceptions:
- In structures provided with approved flame barriers extending 30 inches (760 mm) beyond the exterior wall in the plane of the floor, a vertical separation is not required at the floor except that provided by the vertical thickness of the flame barrier projection.
- Veneers of approved weather-resistant light-transmitting plastics used as exterior siding in buildings of Type V construction in compliance with Section 1405.
- The area of light-transmitting plastic wall panels in exterior walls of greenhouses shall be exempt from the area limitations of Table 2607.4 but shall be limited as required for unprotected openings in accordance with Section 705.9.
TABLE 2607.4—AREA LIMITATION AND SEPARATION REQUIREMENTS FOR LIGHT-TRANSMITTING PLASTIC WALL PANELSa Col2 Col3 Col4 Col5 Col6 FIRE
SEPARATION
DISTANCE
(feet)CLASS OF
PLASTICMAXIMUM
PERCENTAGE AREA
OF EXTERIOR WALL IN
PLASTIC WALL
PANELSMAXIMUM SINGLE
AREA OF PLASTIC
WALL PANELS
(square feet)MINIMUM SEPARATION OF PLASTIC WALL PANELS
(feet)MINIMUM SEPARATION OF PLASTIC WALL PANELS
(feet)FIRE
SEPARATION
DISTANCE
(feet)CLASS OF
PLASTICMAXIMUM
PERCENTAGE AREA
OF EXTERIOR WALL IN
PLASTIC WALL
PANELSMAXIMUM SINGLE
AREA OF PLASTIC
WALL PANELS
(square feet)Vertical Horizontal Less than 6 — Not Permitted Not Permitted — — 6 or more but less
than 11CC1 10 50 8 4 6 or more but less
than 11CC2 Not Permitted Not Permitted — — 11 or more but less
than or equal to 30CC1 25 90 6 4 11 or more but less
than or equal to 30CC2 15 70 8 4 Over 30 CC1 50 Not Limited 3b 0 Over 30 CC2 50 100 6b 3 For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
a. For combinations of plastic glazing and plastic wall panel areas permitted, see Section 2607.6.
b. For reductions in vertical separation allowed, see Section 2607.4.For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
a. For combinations of plastic glazing and plastic wall panel areas permitted, see Section 2607.6.
b.CRSC § 12-11 Medium relevance — show source text
DETECTABLE WARNING PRODUCTS
Sections 12-11A.203 and 12-11B.203. Must comply with the California Code of Regulations, Title 24.
DIRECTIONAL SURFACES
Sections 12-11A.204 and 12-11B.204. Must comply with the California Code of Regulations, Title 24.
INDEPENDENT ENTITY
Sections 12-11A.205 and 12-11B.205. Evaluation by an independent entity to confirm the prescriptive and performance standard of detectable warning products or direction surfaces installed after January 1, 2001. An independent entity is a not-for-profit product safety testing and certification organization, dedicated to testing for public safety. An independent entity would operate for the testing, certification and quality assessment of products, systems and services.
TWO-YEAR APPROVAL
Sections 12-11A.206 and 12-11B.206. Detectable warning products and directional surfaces are to be recertified every two years without exception or waiver.
FEE
Sections 12-11A.207 and 12-11B.207. The Division of the State Architect-Access Compliance may impose a fee on manufacturers of the specified products, to cover the cost of detectable warning products and directional surfaces.
DISABILITY ACCESS ACCOUNT
Sections 12-11A.208 and 12-11B.208. The fees received from manufacturers will be placed in the Disability Access Account.
DETECTABLE WARNING PRODUCTS AND DIRECTIONAL SURFACES
Sections 12-11A.209 and 12-11B.209. Detectable Warning Products and Directional Surfaces must ensure consistency and uniformity: (a) Shape, (b) Color fastness,
(c) Conformation, (d) Sound-on-cane acoustic quality, (e) Resilience, and (f) Attachment will not degrade significantly for at least five years.
SIGNIFICANT DEGRADATION
Sections 12-11A.210 and 12-11B.210. Significant degradation means that the product maintains at least 90 percent of its approved design characteristics.
SELECTION OF INDEPENDENT ENTITY
Sections 12-11A.211 and 12-11B.211. The independent entity selected by the Division of the State Architect-Access Compliance shall be recognized as having appropriate expertise in determining whether products comply with the California Code of Regulations, Title 24.
Authority: Government Code Sections 4450, 4460 and Health & Safety Code Section 18949.1.
Reference: Government Code Section 4460.
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12-13 STANDARDS FOR INSULATING MATERIAL
(See Part 6, Title 24, CCR)
DEPARTMENT OF CONSUMER AFFAIRS
Bureau of Household Goods and Services
CRSC § 12-16 Medium relevance — show source text
CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.
Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-31C RADIATION SHIELDING STANDARDS
STANDARD 12-31C-1
DEPARTMENT OF HEALTH SERVICES
Authority: Sections 102, 208 and 25811.
Reference: Sections 102, 208 and 436.5.
ALL HEALING ARTS X-RAY INSTALLATIONS
Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.
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12-71 AIR FILTERS
STANDARD 12-71-1
STATE FIRE MARSHAL
DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS
Sec. 12-71-100.
(a) Test apparatus.
- The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
CRSC § 2.25 Medium relevance — show source text
00|2.25|0.70|DR|3.70|1.05|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|33 mil cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|16|3.85|1.45|DR|DR|3.40|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|33 mil cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|24|3.40|DR|DR|DR|2.70|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|12|3.00|1.80|DR|DR|3.00|0.65|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|16|3.00|1.00|DR|DR|2.85|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|24|2.85|DR|DR|DR|2.20|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|12|4.00|3.85|2.80|1.80|4.00|3.05|1.50|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|16|4.00|3.30|1.95|0.60|4.00|2.25|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|24|4.00|2.25|DR|DR|4.00|0.65|DR|DR| |For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa.
DR = Design Required, o.c. = on center.
a. Wood furring shall be spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater.CRSC § 64703-64705. Medium relevance — show source text
This installed weight per square foot shall conform with the manufacturer’s installed design density per square foot at the manufacturer’s labeled R -value.
(b) Water heater insulation kits. No water heater insulation kit shall be sold, on or after March 25, 1982, unless it has a thermal resistance of at least R-6 and is so identified.
Each water heater insulation kit sold shall include instructions which are equivalent to the Department of Energy standard practice for the installation of insulation on gas-fired, oil-fired and electric resistance water heaters, 44 Fed. Reg. pages 64703-64705.
Authority: Section 25922, Public Resources Code.
Reference: Section 25922, Public Resources Code.
HISTORY:
- Amendment filed 8-10-81; designated effective 9-22-81 (Register 81, No. 33).
- Editorial correction of subsection (a) filed 1-13-82 (Register 82, No. 2).
INTERPRETATION
Sec. 12-13-1565.
The General Counsel of the Commission shall make a determination as to the application or interpretation of any provision of this article to any person requesting such a determination. Any such request shall be submitted in writing to the Commission. The Commission shall make written replies to such inquiries and shall widely publish interpretations that have broad application or interest.
Authority: Section 25218 (e), Public Resources Code.
Reference: Sections 25920 and 25922, Public Resources Code.
HISTORY:
- Amendment filed 8-10-81; designated effective 9-22-81 (Register 81, No. 33).
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12-16-1 ENGINEERING REGULATIONS—QUALITY AND
DESIGN OF THE MATERIALS OF CONSTRUCTION
CALIFORNIA STANDARD FOR EARTHQUAKE-ACTUATED AUTOMATIC GAS SHUTOFF SYSTEMS (SEE CCR TITLE 24, PART 2, CHAPTERS 16 AND 16A, AND CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-1
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19180–19183, Health and Safety Code. Reference: Section 19182, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-101. The American Society of Civil Engineers (ASCE) requirements for “Earthquake-Actuated Automatic Gas Shutoff Devices,” ANSI/ASCE/SEI 25-16 (copyright 2016 by ASCE), shall be the applicable standard used by the Division of the State Architect for the certification of these devices.
Sec. 12-16-101.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-16-2 ENGINEERING REGULATIONS—QUALITY AND
CRSC § 12-16 Medium relevance — show source text
12-16-1 ENGINEERING REGULATIONS—QUALITY AND
DESIGN OF THE MATERIALS OF CONSTRUCTION
CALIFORNIA STANDARD FOR EARTHQUAKE-ACTUATED AUTOMATIC GAS SHUTOFF SYSTEMS (SEE CCR TITLE 24, PART 2, CHAPTERS 16 AND 16A, AND CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-1
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19180–19183, Health and Safety Code. Reference: Section 19182, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-101. The American Society of Civil Engineers (ASCE) requirements for “Earthquake-Actuated Automatic Gas Shutoff Devices,” ANSI/ASCE/SEI 25-16 (copyright 2016 by ASCE), shall be the applicable standard used by the Division of the State Architect for the certification of these devices.
Sec. 12-16-101.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-16-2 ENGINEERING REGULATIONS—QUALITY AND
DESIGN OF THE MATERIALS OF CONSTRUCTION
CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.
Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-31C RADIATION SHIELDING STANDARDS
STANDARD 12-31C-1
DEPARTMENT OF HEALTH SERVICES
California Referenced Standards Code Medium relevance — show source text
3/8″
main reinforcement bars at 57/8″ pitch
with7/8″ concrete cover;3/8″ main rein-
forcement bars at 41/2″ pitch
perpendicular with1/2″ concrete cover;
13′1″ span restrained.|195 psf|4 hrs|||7|1, 7|4| |F/C-4-RC-7|4″|4″ (5025 psi) concrete deck;1/4″ reinforce-
ment bars at 71/2″ pitch with3/4″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 2|11/4| |F/C-4-RC-8|4″|4″ thick (4905 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|100 psf|1 hr
23 min|||7|1, 2|11/3| |F/C-4-RC-9|4″|4″ deep (4370 psi);1/4″ reinforcement bars
at 6″ pitch with3/4″ cover;1/4″ main rein-
forcement bars at 4″ pitch perpendicular
with1/2″ cover; 13′1″ span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-10|4″|4″ thick (5140 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 5|11/4| |F/C-4-RC-11|4″|4″ thick (4000 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom of slab; 6′6″
span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-12|4″|4″ deep (2380 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.CRSC § 101.1 Medium relevance — show source text
1 ADMINISTRATION
SECTION 101—GENERAL
101.1 Title. These regulations shall be known as the California Green Building Standards Code, may be cited as such, and will be referred to herein as “this code.” It is intended that it shall also be known as the CALGreen Code. The California Green Building Stan- dards Code is Part 11 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.
101.2 Purpose. The purpose of this code is to improve public health, safety and general welfare by enhancing the design and construction of buildings through the use of building concepts having a reduced negative impact or positive environmental impact and encouraging sustainable construction practices in the following categories:
- Planning and design.
- Energy efficiency.
- Water efficiency and conservation.
- Material conservation and resource efficiency.
- Environmental quality.
101.3 Scope. The provisions of this code shall apply to the planning, design, operation, construction, use and occupancy of every newly constructed building or structure, unless otherwise indicated in this code, throughout the State of California.
It is not the intent that this code substitute or be identified as meeting the certification requirements of any green building
program.
101.3.1 State-regulated buildings, structures and applications. Provisions of this code shall apply to the following buildings, structures and applications regulated by state agencies as specified in Sections 103 through 106, except where modified by local ordinance pursuant to Section 101.7. When adopted by a state agency, the provisions of this code shall be enforced by the appropriate enforcing agency, but only to the extent of authority granted to such agency by statute.
State-owned buildings, including buildings constructed by the Trustees of the California State University, and to the extent permitted by California law, buildings designed and constructed by the Regents of the University of California and regulated by the Building Standards Commission. See Section 103 for additional scoping provisions.
Energy efficiency standards regulated by the California Energy Commission.
All residential buildings constructed throughout the State of California, including but not limited to, hotels, motels, lodging houses, apartments, dwellings, dormitories, condominiums, shelters for homeless persons, congregate residences, employee housing, factory-built housing and other types of dwellings containing sleeping accommodations with or without common toilets or cooking facilities regulated by the Department of Housing and Community Development. See Section 104 for additional scoping provisions.
Public elementary and secondary schools, and community college buildings regulated by the Division of the State Architect. See Section 105 for additional scoping provisions.
Qualified historical buildings and structures and their associated sites regulated by the State Historical Building Safety Board within the Division of the State Architect.
General acute care hospitals, acute psychiatric hospitals, skilled nursing and/or intermediate care facilities, clinics licensed by the Department of Public Health and correctional treatment centers regulated by the Office of Statewide Health Planning and Development. See Section 106 for additional scoping provisions.
Graywater systems regulated by the Department of Water Resources and the Department of Housing and Community Development.
Green building standards for occupancies where no state agency has authority or expertise, adopted by the California Building Standards Commission. See Section 103 for additional scoping provisions.
Frequently asked questions
Who exactly do I contact to request a shielding variance?
Contact the California Department of Health Services — they are the only agency authorized to grant variances to the shielding standards cited in § 12-31C-101. The CRSC text itself does not include an application form or process; contact the Department for procedural guidance.
Can my local building official authorize a temporary reduction in shielding?
No. Local officials enforce the CRSC/CBC requirements but do not have authority to grant exceptions to the NCRP‑based shielding standards named in § 12-31C-101; only the Department of Health Services can grant such an exception.
Are the NCRP reports mandatory or advisory?
They are mandatory for the purposes of the CRSC shielding standard: § 12-31C-101 requires compliance with the specific NCRP reports it lists.
If the Department issues a variance, does that relieve me of local plan check?
No. A Department variance addresses the CRSC standard; local plan check and enforcement remain necessary for building permits and occupancy. The Department’s variance does not replace required local permits or inspections (the CRSC does not spell out process interactions — confirm with both the Department and your local AHJ).
Where can I find the actual shielding calculation methods?
The calculation methods are in the NCRP Reports referenced in § 12-31C-101. The CRSC names those reports as the mandatory reference; obtain the NCRP publications and follow their procedures when preparing a submission to the Department.
More in California Referenced Standards Code
- Administration and scope — CRSC Chapter 12 overview
- Air filter standards (Chapter 12‑71)
- Building and facility access / accessibility standards (Chapters 12‑11A, 12‑11B)
- Engineering regulations — quality and design of construction materials (12‑16 series)
- Exits and means of egress (Chapters 12‑10 series)
- Protective signaling systems and detectors (Chapters 12‑72‑1, ‑2, ‑3)
- Radiation shielding standards (Chapter 12‑31C)
- Referenced standards index / cross‑reference table (Part 12 listing of referenced standards)
- Releasing systems for security bars (egress-release standards)
- Standards for insulating materials (Chapter 12‑13)
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