Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:

• CRSC § 12-16 High 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

• CRSC § 12-16 High 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.

  1. 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 § 100.0 High relevance — show source text

  2025 CRSC Reference Standard Code

  Converted from PDF using pymupdf4llm Source: 2025 CRSC Reference Standard Code.pdf Text ratio: 100.0% Conversion date: 2025-10-05 09:12:42

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  PREFACE

  This document is Part 12 of thirteen parts of the official triennial compilation and publication of the adoptions, amendments and repeal of administrative regulations to California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part is known as the California Referenced Standards Code.

  The California Building Standards Code is published in its entirety every three years by order of the California legislature, with supplements published in intervening years. The California legislature delegated authority to various state agencies, boards, commissions and departments to create building regulations to implement the State’s statutes. These building regulations, or standards, have the same force of law, and take effect 180 days after their publication unless otherwise stipulated. The Califor- nia Building Standards Code applies to occupancies in the State of California as annotated.

  A city, county, or city and county may establish more restrictive building standards reasonably necessary because of local climatic, geological or topographical conditions. Findings of the local condition(s) and the adopted local building standard(s) must generally be filed with the California Building Standards Commission (or other filing if indicated) to become effective, and may not be effective sooner than the effective date of this edition of the California Building Standards Code . Local building standards that were adopted and applicable to previous editions of the California Building Standards Code do not apply to this edition without appropriate adoption and the required filing.

  The referenced standards contained in Part 12 are developed by the state agencies listed herein. The Part 12 Cross Reference Table herein identifies the state agency to which the standard applies, the subject of the standard and the provisions in other parts of Title 24 where the application of the standard is required.

  Should you find publication (e.g., typographical) errors or inconsistencies in this code or wish to offer comments toward improving its format, please address your comments to:

  California Building Standards Commission 2525 Natomas Park Drive, Suite 130 Sacramento, CA 95833-2936

  Phone: (916) 263-0916 Email: cbsc@dgs.ca.gov

  Web page: www.dgs.ca.gov/bsc

  ACKNOWLEDGMENTS

  The 2025 California Building Standards Code (Code) was developed through the outstanding collaborative efforts of the Department of Housing and Community Development, Division of the State Architect, Office of the State Fire Marshal, Department of Health Care Access and Information, California Energy Commission, California Department of Public Health, California State Lands Commission, Board of State and Community Corrections, Department of Water Resources, State Historical Building Safety Board, Department of Consumer Affairs, State Librarian, Department of Food and Agriculture, and the California Building Standards Commission (Commission).

  This collaborative effort included the assistance of the Commission’s Code Advisory Committees and many other volunteers who worked tirelessly to assist the Commission in the production of this Code.

  Governor Gavin Newsom

  Members of the California Building Standards Commission

  Secretary Amy Tong – Chair Rajesh Patel – Vice-Chair

• CRSC § 9.5 High relevance — show source text

  2. The specimen shall be suspended vertically with its lower edge 2 inches (51 mm) above the top of a [3] / 8 inch (9.5 mm) diameter Bunsen Burner. The test shall be performed in a draft-free area.

  3. The flames from the burner shall be 4 inches (101 mm) long and shall be adjusted with sufficient air supply to eliminate any yellow flame tips but without any distinct inner blue cone.

  4. The specimen shall be exposed to the flame at each corner and at not less than one other point along the lower edge. Each exposure shall be of sufficient duration to determine if the material will ignite and continue to burn, but shall be not less than 20 seconds.

  5. The criteria for acceptance shall be as follows: (A) There shall be not more than intermittent flaming appreciably beyond the area exposed to the test flame. (B) Flame shall not reach the top of the specimen. (C) On removing the test flame there shall be not more than 1 second of after flaming except there may be nonprogressive flaming of short duration in areas of accumulated char which were directly exposed to the test flame.

  Section 12-7-502

  (a) Framed rigid combustible decorative material. Rigid combustible decorative material and assemblies of materials not more than [1] / 4 inch (6 mm) in thickness used for folding doors, room dividers, decorative screens and similar applications, and which are installed with all edges protected, shall conform to the following:

  1. All exposed edges shall be protected with frames of metal or other noncombustible material, or solid wood of minimum [1] / 4 inch (6 mm) dimension.

  2. The total square foot area of the material shall not exceed ten percent of that of the floor area of the room in which the material is installed.

  3. When tested as follows, flames shall not reach the top edge of the specimen. The test shall be conducted in a draft free area, on a specimen of the material 12 inches by 12 inches (305 mm by 305 mm) suspended at a 45-degree angle from the horizontal with the upper and lower edges in a horizontal plane. The test flame shall be 3 inches (76 mm) long from a Bunsen burner of approximately [1] / 2 -inch (13 mm) inside diameter with the air supply completely shut off. The burner shall be positioned so that its top is 1 inch (25 mm) vertically below a point on the lower surface of the test specimen, 1 inch (25 mm) up from its lower horizontal edge and midway between the inclined edges. The exposure to the test flame and the duration of test shall be for a period of 2 minutes.

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  12-7A MATERIALS AND CONSTRUCTION METHODS

  FOR EXTERIOR WILDFIRE EXPOSURE

  EXTERIOR WALL SIDING AND SHEATHING

  SFM STANDARD 12-7A-1

  12-7A-1.1 Application. The minimum design, construction and performance standards set forth herein for exterior wall siding and sheathing are those deemed necessary to establish conformance to the provisions of these regulations. Materials and assemblies that meet the performance criteria of this standard are acceptable for use as defined in California Building Standards Code.

• CRSC § 12-10 High relevance — show source text

  CHAPTER 12-10-1 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

  CHAPTER 12-10-2 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

  CHAPTER 12-10-3 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

  CHAPTERS 12-11A AND 12-11B

  BUILDING AND FACILITY ACCESS

  SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 85

  CHAPTER 12-12 RESERVED . . . . . . . . . . . . . . . . . . . . . . . . . 87

  CHAPTER 12-13 STANDARDS FOR INSULATING

  MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . 89

  CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

  CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

  AND DESIGN OF THE MATERIALS OF

  CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

  CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

  CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

  CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

  CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

  CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

  HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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  PART 12 CROSS REFERENCE TABLE

  (Cross reference table is nonregulatory, intended only as an aid to the code user.)

• CRSC § 12-11 High relevance — show source text

  (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

  ARTICLE 3. STANDARDS FOR INSULATING MATERIAL

  APPLICATION AND SCOPE

  Sec. 12-13-1551.

  (a) This article establishes standards governing the quality of insulation sold within the state after September 22, 1981, including those properties which affect the safety and thermal performance of insulation during application and in the use intended.

  (b) The provisions of this article shall apply only to the following types of insulating material:

  1. Aluminum foil (reflective foil);

  2. Cellular glass (board form);

  3. Cellulose fiber (loose fill and spray applied);

  4. Mineral aggregate (board form);

  5. Mineral fiber (blankets, board form, loose fill);

  6. Perlite (loose fill);

  7. Polystyrene (board form, molded and extruded);

  8. Polyurethane (board form and field applied);

  9. Polyisocyanurate (board form and field applied);

  10. Urea formaldehyde foam (field applied);

  11. Vermiculite (loose fill).

  (c) The provisions of this article shall apply to the sale of insulating material within the state. The provisions of this article shall not apply to insulating material manufactured in California, but sold outside the state, nor to insulating material manufactured outside California and sold wholesale in California for final retail sale outside the state. For the purpose of this article, the sale of a building or an appliance which contains installed insulating material is not considered the sale of the insulating material.

  (d) Any type of insulating material not listed in subsection (b) may be sold within California notwithstanding any other provision of this article.

  Authority: Sections 25920 and 25922, Public Resources Code.

  Reference: Sections 25910, 25920, 25921 and 25922, Public Resources Code.

• CRSC § 15-2 High relevance — show source text

  are listed below|||||||X|||||||||||||||||X| |Chapter / Section||||||||||||||||||||||||| |UBC 15-2|||X|||||||||||||||||||||| |UBC 15-3|||X|||||||||||||||||||||| |UBC 15-4|||X|||||||||||||||||||||| |UL 13-96|||X|||||||||||||||||||||| |UL 38-99|||X|||||||||||||||||||||| |UL 193-04|||X|||||||||||||||||||||| |UL 199-95|||X|||||||||||||||||||||| |UL 228-97|||X|||||||||||||||||||||| |UL 260-04|||X|||||||||||||||||||||| |UL 262-04|||X|||||||||||||||||||||| |UL 268A-09|||X|||||||||||||||||||||| |UL 312-04|||X|||||||||||||||||||||| |UL 346-05|||X|||||||||||||||||||||| |UL 464-03|||X|||||||||||||||||||||| |UL 497B-04|||X|||||||||||||||||||||| |UL 521-99|||X|||||||||||||||||||||| |UL 539-00|||X|||||||||||||||||||||| |UL 632-00|||X|||||||||||||||||||||| |UL 753-04|||X|||||||||||||||||||||| |UL 790_Edition 9-2022_|||X|||||||||||||||||||||| |UL 813-96|||X|||||||||||||||||||||| |UL 857-13||||||||†|†|X|X|X||X|X|||||||||| |UL 864-2014|||X||||||||||||||||||||||

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

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  35 REFERENCED STANDARDS

  User notes:

  About this chapter: The California Building Code contains numerous references to standards promulgated by other organizations that are used to provide requirements for materials and methods of construction. This chapter 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.

  [DSA-SS, DSA-SS/CC, OSHPD 1 & 4] Reference to other chapters. In addition to the code sections referenced, the standards listed in this chapter are applicable to the respective code sections in Chapters 16A, 17A, 18A, 19A, 21A and 22A.

  This chapter lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section 102.4.

  AA Aluminum Association, 1400 Crystal Drive, Suite 430, Arlington, VA 22202

• CRSC § 25.4 High relevance — show source text

  For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa, 1 ton = 8.896 kN.

  Notes:

  1. Failure mode—collapse.

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  RESOURCE A—GUIDELINES ON FIRE RATINGS OF ARCHAIC MATERIALS AND ASSEMBLIES

  TABLE 2.5.1.2 STEEL COLUMNS—CONCRETE ENCASEMENTS 6″ TO LESS THAN 8″ THICK	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
  ITEM CODE	MINIMUM DIMENSION	CONSTRUCTION DETAILS	PERFORMANCE	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	REC. HOURS
  ITEM CODE	MINIMUM DIMENSION	CONSTRUCTION DETAILS	LOAD	TIME	PRE-BMS-92	BMS-92	POST-BMS-92	POST-BMS-92	POST-BMS-92
  C-7-SC-1	7″	7″ × 8″ column; 4″ × 3″ × 10 lbs “H” beam; protection: brick filled concrete (6220 psi); 6″ × 4″—13 SWG mesh; 1″ below column surface.	12 tons	2 hrs 46 min			7	1	23/4
  C-7-SC-2	7″	7″ × 8″ column; 4″ × 3″ × 10 lbs “H” beam; protection: gravel concrete (5140 psi); 6″ × 4″—13 SWG mesh; 1″ below surface.	12 tons	3 hrs 1 min			7	1	3
  C-7-SC-3	7″	7″ × 8″ column; 4″ × 3″ × 10 lbs “H” beam; protection: concrete (4540 psi); 6″ × 4″—13 SWG mesh; 1″ below column surface.	12 tons	3 hrs 9 min			7	1	3
  C-7-SC-4	7″	7″ × 8″ column; 4″ × 3″ × 10 lbs “H” beam; protection: gravel concrete (5520 psi); 4″ × 4″—16 SWG mesh.	12 tons	2 hrs 50 min			7	1	23/4

  For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa, 1 ton = 8.896 kN.

  Notes:

  1. Failure mode—collapse.

  FIGURE 2.5.1.3

  STEEL COLUMNS—CONCRETE ENCASEMENTS

  MINIMUM DIMENSION 8 ″ TO LESS THAN 10 ″

• CRSC § 102.4 Medium relevance — show source text

  Chapter 14 is applicable to any building that is moved or relocated. This chapter is independent of any of the three compliance methods and focuses on the structural loads where the building is being relocated.

  Chapter 15 Construction Safeguards.

  Chapter 15 establishes specific regulations in order to minimize the risk to the public and adjacent property during construction. Additionally, this chapter addresses fire and life safety and means of egress during the construction process. This includes requirements for a site safety plan. This chapter is also consistent with Chapter 33 of the CBC and Chapter 33 of the California Fire Code (CFC).

  Chapter 16 Referenced Standards.

  Chapter 16 lists all of the product and installation standards and codes that are referenced throughout Chapters 1 through 15 and includes identification of the promulgators and the section numbers in which the standards and codes are referenced. As stated in Section 102.4, these standards and codes become an enforceable part of the code (to the prescribed extent of the reference) as if printed in the body of the code.

  Appendix A Guidelines for the Seismic Retrofit of Existing Buildings.

  Appendix A provides guidelines for upgrading the seismic resistance capacity of different types of existing buildings. It is organized into separate chapters which deal with buildings of different types, including unreinforced masonry buildings, reinforced concrete and reinforced masonry wall buildings, and lightframe wood buildings. This appendix includes its own referenced standards.

  Appendix B Supplementary Accessibility Requirements for Existing Buildings and Facilities.

  Chapters 11A and 11B of the CBC contain provisions that set forth requirements for accessibility to buildings and their associated sites and facilities for people with physical disabilities. Appendix B was added to address accessibility in construction for items that are not typically enforceable through the traditional building code enforcement process.

  Appendix C Guidelines for the Wind Retrofit of Existing Buildings.

  The purpose of Appendix C is to provide voluntary prescriptive alternatives for addressing the retrofit of buildings in high-wind areas. Currently, there are two chapters which deal with the retrofit of gable ends and the fastening of roof decks, Appendix Chapters C1 and C2, respectively. This appendix includes its own referenced standards.

  Appendix D Board of Appeals.

  Appendix D contains the provisions for appeal and the establishment of a board of appeals. The provisions include the application for an appeal, the makeup of the board of appeals and the conduct of the appeal process.

  Appendix E Temporary Emergency Uses.

  Appendix E is intended to provide guidance for designers, engineers, architects and fire and building officials on allowing temporary emergency uses of existing buildings with respect to the minimum code requirements. This appendix is a template or checklist that references the relevant code requirement of concerns.

  Resource A Guidelines on Fire Ratings of Archaic Materials and Assemblies.

  In the process of repair and alteration of existing buildings, based on the nature and the extent of the work, the CEBC might require certain upgrades in the fire-resistance rating of building elements, at which time it becomes critical for the designers and the code

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  officials to be able to determine the fire-resistance rating of the existing building elements as part of the overall evaluation for the assessment of the need for improvements. These guidelines are based upon the Guideline on Fire Ratings of Archaic Materials published by the National Institute of Building Sciences (NIBS).

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• CRSC § 1030.14.1.3 Medium relevance — show source text

  [BE] 1030.14.1.3 Edge protection. Ramped aisles shall have edge protection in accordance with Sections 1012.10 and 1012.10.1.

  Exception: In assembly spaces with fixed seating, edge protection is not required on the sides of ramped aisles where the ramped aisles provide access to the adjacent seating and aisle accessways.

  [BE] 1030.14.2 Stepped aisles. Aisles with a slope exceeding 1 unit vertical in 8 units horizontal (12.5-percent slope) shall consist of a series of risers and treads that extends across the full width of aisles and complies with Sections 1030.14.2.1 through 1030.14.2.4.

  [BE] 1030.14.2.1 Treads. Tread depths shall be not less than 11 inches (279 mm) and shall have dimensional uniformity. Exception: The tolerance between adjacent treads shall not exceed [3] / 16 inch (4.8 mm).

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  MEANS OF EGRESS

  [BE] 1030.14.2.2 Risers. Where the gradient of stepped aisles is to be the same as the gradient of adjoining seating areas, the riser height shall be not less than 4 inches (102 mm) nor more than 8 inches (203 mm) and shall be uniform within each flight.

  Exceptions:

  1. Riser height nonuniformity shall be limited to the extent necessitated by changes in the gradient of the adjoining seating area to maintain adequate sightlines. Where nonuniformities exceed [3] / 16 inch (4.8 mm) between adjacent risers, the exact location of such nonuniformities shall be indicated with a distinctive marking stripe on each tread at the nosing or leading edge adjacent to the nonuniform risers. Such stripe shall be not less than 1 inch (25 mm), and not more than 2 inches (51 mm), wide. The edge marking stripe shall be distinctively different from the contrasting marking stripe.
  2. Riser heights not exceeding 9 inches (229 mm) shall be permitted where they are necessitated by the slope of the adjacent seating areas to maintain sightlines.

  [BE] 1030.14.2.2.1 Construction tolerances. The tolerance between adjacent risers on a stepped aisle that were designed to be equal height shall not exceed [3] / 16 inch (4.8 mm). Where the stepped aisle is designed in accordance with Exception 1 of Section 1030.14.2.2, the stepped aisle shall be constructed so that each riser of unequal height, determined in the direction of descent, is not more than [3] / 8 inch (9.5 mm) in height different from adjacent risers where stepped aisle treads are less than 22 inches (560 mm) in depth and [3] / 4 inch (19.1 mm) in height different from adjacent risers where stepped aisle treads are 22 inches (560 mm) or greater in depth.

• CRSC § 25.4 Medium relevance — show source text

  
  (MIN)**| |ITEM CODE|THICKNESS|CONSTRUCTION DETAILS|LOAD|PRE-BMS-92|BMS-92|POST-BMS-92|POST-BMS-92|POST-BMS-92| |FR-I-12|1/2″|1/2″ thick 1:2; 1:3 gypsum plaster on wood
  lath.|15 minutes||1||1–3|15| |FR-I-13|7/8″|1/2″ thick 1:2; 1:2 gypsum plaster on3/8″
  perforated gypsum lath.|30 minutes||1||1–3|30| |FR-I-14|7/8″|1/2″ thick 1:2; 1:2 gypsum plaster on3/8″
  thick plain or indented gypsum plaster.|20 minutes||1||1–3|20| |FR-I-15|3/8″|3/8″ gypsum wallboard.|10 minutes||1||1, 2|10| |FR-I-16|1/2″|1/2″ gypsum wallboard.|15 minutes||1||1, 2|15|

  For SI: 1 inch = 25.4 mm, °C = [(°F) - 32]/1.8.

  Notes:

  1. The finish rating is the time required to obtain an average temperature rise of 250°F, or a single point rise of 325°F, at the interface between the material being rated and the substrate being protected.
  2. Tested in accordance with the Standard Specifications for Fire Tests of Building Construction and Materials, ASA No. A2-1932.
  3. Mix proportions for plasters as follows: first ratio, dry weight of plaster to dry weight of sand for scratch coat; second ratio, plaster to sand for brown coat.
  4. Neat plaster means unsanded wood-fiber gypsum plaster.

  TABLE 1.5.2 FINISH RATINGS—ORGANIC MATERIALS	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9
  ITEM CODE	THICKNESS	CONSTRUCTION DETAILS	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	REC. F.R. (min)
  ITEM CODE	THICKNESS	CONSTRUCTION DETAILS	FINISH RATING	PRE-BMS-92	BMS-92	POST-BMS-92	POST-BMS-92	POST-BMS-92
  FR-O-1	9/16″	7/16″ wood fiberboard faced with1/8″ cement-asbestos board.	15 minutes		1		1, 2	15
  FR-O-2	29/32″	3/4″ wood sheathing, asbestos felt weighing 14 lbs/100 ft2 and5/32″ cement-asbestos shingles.	20 minutes		1		1, 2	20
  FR-O-3	11/2″	1″ thick magnesium oxysulfate wood fiber- board faced with 1:3; 1:3 gypsum plaster,1/2″ thick.