CRC · California Residential Code
Structural referenced standards (concrete, masonry, steel)
This page orients users to the CRC rules that adopt external concrete, masonry and steel standards and points to the key code sections and Chapter 44 references.
Last reviewed: July 6, 2026
Overview
This hub covers the CRC provisions that incorporate external technical standards for concrete, masonry and structural steel used in one- and two‑family dwellings. These referenced documents — listed in Chapter 44 — supply the material specifications, test methods and design rules the CRC relies on (for example, ACI 318 for concrete and various ASTM and TMS standards for masonry) and are enforceable where the CRC cites them .
Key CRC provisions to watch are the masonry rules in §R606 (general masonry construction and material standards) and the concrete provisions in §R608 (materials and concrete practice), which call out material standards and design references such as ACI 318 and ACI 332 . Steel and cold‑formed steel design is governed where the CRC references industry standards (AISC/AISI/etc.) and by the same Chapter 44 referenced‑standards list; details on required reinforcement and steel specifications are linked to ASTM/AISI documents cited in the code .
Always confirm which edition of a referenced standard the CRC adopts and follow the specific CRC section cited (for example §R404, §R402 and the specific subsections listed in Chapter 44) because the code’s prescriptive and material requirements are effective only to the extent they are adopted by the CRC .
In this section
Code references
Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:
CRC § 2.2 High relevance — show source text
R606.2.2
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REFERENCED STANDARDS
C216—21: Specification for Facing Brick (Solid Masonry Units Made from Clay or Shale) R202, Table R301.2(1), R606.2.2
C270—19ae1: Specification for Mortar for Unit Masonry R606.2.8, Table R606.2.8, R606.2.11
C315—2007(2021): Specification for Clay Flue Liners and Chimney Pots R1001.8, R1003.11.1, Table R1003.14(1)
C406/C406M—2015: Specification for Roofing Slate
R905.6.4
C475/C475M—2017: Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
R702.3.1
C476—20: Specification for Grout for Masonry
R606.2.12
C503/C503M—2015: Standard Specification for Marble Dimension Stone
R606.2.4
C514—04(2020): Standard Specification for Nails for the Application of Gypsum Board
R702.3.1
C552—22: Standard Specification for Cellular Glass Thermal Insulation
Table R906.2
C557—2003(2017): Specification for Adhesives for Fastening Gypsum Wallboard to Wood Framing
R702.3.1.1
C568M—2015: Standard Specification for Limestone Dimension Stone
R606.2.4
C578—19: Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation R403.3, Table R703.8.4(2), Table R703.15.1, Table R703.15.2, Table R703.16.1, Table R703.16.2, Table R906.2
C587—2004(2018): Specification for Gypsum Veneer Plaster
R702.2.1
C595/C595M—21: Specification for Blended Hydraulic Cements
R608.5.1.1, R702.2.2, R703.7.2
C615/C615M—2018E1: Standard Specification for Granite Dimension Stone
R606.2.4
C616/C616M—2015: Standard Specification for Quartz-Based Dimension Stone
R606.2.4
C629/C629M—2015: Standard Specification for Slate Dimension Stone
R606.2.4
C631—09(2020): Standard Specification for Bonding Compounds for Interior Gypsum Plastering
R702.2.1
C645—2018: Specification for Nonstructural Steel Framing Members
R702.3.3
C652—21: Specification for Hollow Brick (Hollow Masonry Units Made from Clay or Shale) R202, Table R301.2(1), R606.2.2
C685/C685M—2017: Specification for Concrete Made by Volumetric Batching and Continuous Mixing
R404.1.3.3.2, R608.5.1.2
C726—2017: Standard Specification for Mineral Wool Roof Insulation Board
Table R906.2
CRC § 1.9.2.1 High relevance — show source text
Chapter 19 Concrete.
Chapter 19 provides minimum accepted practices for the design and construction of buildings and structural components using concrete, both plain and reinforced. This chapter relies primarily on the reference to American Concrete Institute (ACI) 318, Building Code Requirements for Structural Concrete .
Chapter 19A Concrete.
Chapter 19A provides minimum accepted practices for the design and construction of buildings and structural components using concrete, both plain and reinforced. Chapter 19A is applicable to structures regulated by the Division of the State Architect—Structural Safety, which include public elementary and secondary schools, community colleges, and state-owned or state-leased essential services buildings (applications listed in Section 1.9.2.1 (DSA-SS)), and by the Department of Health Care Access and Information/Office of State- wide Hospital Planning and Development, which include hospitals and correctional treatment centers (applications listed in Sections 1.10.1 (OSHPD 1) and 1.10.4 (OSHPD 4)).
Chapter 20 Aluminum.
Chapter 20 contains standards for the use of aluminum in building construction. This chapter references national standards from the Aluminum Association (AA) for use of aluminum in building construction, AA ASM 35, Aluminum Sheet Metal Work in Building Construc- tion, and AA ADM, Aluminum Design Manual .
Chapter 21 Masonry.
Chapter 21 provides comprehensive and practical requirements for masonry construction.
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Chapter 21A Masonry.
Chapter 21A provides comprehensive and practical requirements for masonry construction. Chapter 21A is applicable to structures regu- lated by the Division of the State Architect—Structural Safety, which include public elementary and secondary schools, community colleges, and state-owned or state-leased essential services buildings (applications listed in Section 1.9.2.1 (DSA-SS)), and by the Depart- ment of Health Care Access and Information/Office of Statewide Hospital Planning and Development, which include hospitals and correctional treatment centers (applications listed in Sections 1.10.1 (OSHPD 1) and 1.10.4 (OSHPD 4)).
Chapter 22 Steel.
Chapter 22 provides the requirements necessary for the design and construction of structural steel (including composite construction), cold-formed steel, steel joists, steel cable structures and steel storage racks. Chapter 22 requires that the design and use of steel materials be in accordance with the specifications and standards of the American Institute of Steel Construction, the American Iron and Steel Institute, the Steel Joist Institute and the American Society of Civil Engineers.
Chapter 22A Steel.
CRC § 0.7 High relevance — show source text
For cantilever members,l shall be taken as twice the length of the cantilever.
j. The snow load shall be permitted to be taken as 0.7 times the design snow load determined in accordance with Section 1608_A_.1 for the purpose of determining deflection
limits in Table 1604_A_.3.|1604 A .3.1 Deflections. The deflections of structural members shall not exceed the more restrictive of the limitations of Sections 1604 A .3.2 through 1604A.3.9 or that permitted by Table 1604 A .3.
1604 A .3.2 Reinforced concrete. The deflection of reinforced concrete structural members shall not exceed that permitted by ACI 318.
1604 A .3.3 Steel. The deflection of steel structural members shall not exceed that permitted by AISC 360, AISI S100, ASCE 8, SJI 100 or SJI 200, as applicable.
1604 A .3.4 Masonry. The deflection of masonry structural members shall not exceed that permitted by TMS 402.
1604 A .3.5 Aluminum. The deflection of aluminum structural members shall not exceed that permitted by AA ADM.
1604 A .3.6 Limits. The deflection limits of Section 1604 A .3.1 shall be used unless more restrictive deflection limits are required by a referenced standard for the element or finish material.
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STRUCTURAL DESIGN
1604 A .3.7 Framing supporting glass. The deflection of framing members supporting glass subjected to 0.6 times the “component and cladding” wind loads shall not exceed either of the following:
- 1 / 175 of the length of span of the framing member, for framing members having a length not more than 13 feet 6 inches (4115 mm).
- 1 / 240 of the length of span of the framing member + 1 / 4 inch (6.4 mm), for framing members having a length greater than 13 feet 6 inches (4115 mm).
1604A.3.8 Horizontal diaphragms. The maximum span-depth ratio for any roof or floor diaphragm consisting of steel and compos- ite steel slab decking shall not exceed those given in Table 1604A.4, unless test data and design calculations acceptable to the enforcement agency are submitted and approved for the use of other span-depth ratios. Concrete diaphragms shall not exceed the span depth ratios for the equivalent composite steel-slab diaphragm in Table 1604A.4.
TABLE 1604A.4-MAXIMUM HORIZONTAL DIAPHRAGM SPAN AND SPAN-DEPTH RATIOS 1, 3, 4 Col2 Col3 Col4 Col5 Col6 FLEXIBILITY
FACTOR(F)2MAXIMUM DIAPHRAGM
SPAN FOR MASONRY OR
**_CONCRETE WALLSCRC § 2.5 High relevance — show source text
R606.2.5
C1396/C1396M—2017: Specification for Gypsum Board Table R602.3(1), R702.2.1, R702.2.2, R702.3.1, R702.3.7
C1405—20a: Standard Specification for Glazed Brick (Single Fired, Brick Units)
R606.2.2
C1492—2003(2016): Specification for Concrete Roof Tile
R905.3.5
C1513—2018: Standard Specification for Steel Tapping Screws for Cold-Formed Steel Framing Connections R505.2.5, R603.2.5, R702.3.5.1, Table R703.3(2), Table R703.16.1, Table R703.16.2, R804.2.5
C1634—20: Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units
R606.2.1
C1658/C1658M—19e1: Standard Specification for Glass Mat Gypsum Panels
R702.3.1
C1670/1670M—21b: Standard Specification for Adhered Manufactured Stone Masonry Veneer Units
R606.2.6
C1691—2021: Standard Specification for Unreinforced Autoclaved Aerated Concrete (AAC) Masonry Units
R606.2.3
C1693—2011(2017): Standard Specification for Autoclaved Aerated Concrete (AAC)
R606.2.3
C1766—2015(2019): Standard Specification for Factory-Laminated Gypsum Panel Products
R702.3.1
C1902—20: Standard Specification for Cellular Glass Insulation Used in Building and Roof Applications
Table R906.2
D41/D41M—2011(2016): Specification for Asphalt Primer Used in Roofing, Dampproofing and Waterproofing Table R905.9.2, Table R905.11.2
D43/D43M—2000(2018): Specification for Coal Tar Primer Used in Roofing, Dampproofing and Waterproofing
Table R905.9.2
D226/D226M—2017: Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing R703.2, R905.1.1, Table R905.1.1(1), R905.8.4, Table R905.9.2
D227/D227M—2003(2018): Specification for Coal-Tar-Saturated Organic Felt Used in Roofing and Waterproofing
Table R905.9.2
D312/D312M—2016a: Specification for Asphalt Used in Roofing
Table R905.9.2
D422—63(2007)E2: Test Method for Particle-Size Analysis of Soils
R403.1.8.1
D449/D449M—03(2021): Specification for Asphalt Used in Dampproofing and Waterproofing
R406.2
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REFERENCED STANDARDS
D450/D450M—2017(2018): Specification for Coal-Tar Pitch Used in Roofing, Dampproofing and Waterproofing
Table R905.9.2
CRC § 44-2 High relevance — show source text
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Part IX— Referenced Standards
44 REFERENCED STANDARDS
Notwithstanding California laws and regulations, these referenced standards shall be applicable only to those California Residential Code sections that are adopted.
User notes:
About this chapter: The one- and two-family dwelling code contains numerous references to standards promulgated by other organizations that are used to provide requirements for materials, products and methods of construction. Chapter 44 contains a comprehensive list of all standards that are referenced in this code. These standards, in essence, are part of this code to the extent of the reference to the standard.
This chapter lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section R102.4.
ABTG Applied Building Technology Group LLC6300 Enterprise Lane Madison, WI 53719
ANSI/ABTG FS 100—2012 (R2018): Standard Requirements for Wind Pressure Resistance of Foam Plastic Insulation Sheathing Used in Exterior Wall Covering Assemblies
R303.8
ACCA Air Conditioning Contractors of America 1330 Braddock Place, Suite 350 Alexandria, VA 22314
ANSI/ACCA 2 Manual J—2016: Residential Load Calculation
Table R301.2
ACI American Concrete Institute 38800 Country Club Drive Farmington Hills, MI 48331
318—19: Building Code Requirements for Structural Concrete R402.2, R404.1.3, R404.1.3.1, Table R404.1.3.2(2), Table R404.1.3.2(5), Table R404.1.3.2(6), Table R404.1.3.2(7), Table R404.1.3.2(8), R404.1.3.3, R404.1.3.4, R404.1.4.2, R404.5.1, R608.1, R608.1.1, R608.1.2, R608.2, R608.5.1, R608.6.1, R608.8.2, R608.9.2, R608.9.3
332—20: Residential Code Requirements for Structural Concrete
R402.2, R403.1, R404.1.3, R404.1.3.4, R404.1.4.2, R506.1
AISI American Iron and Steel Institute 25 Massachusetts Avenue, NW Suite 800 Washington, DC 20001
AISI S100—16 (2020) w/S2—20: North American Specification for the Design of Cold-Formed Steel Structural Members, 2016 Edition (Reaffirmed 2020), with Supplement 2, 2020 Edition
R608.9.2, R608.9.3
AISI S220—20: North American Standard for Cold-Formed Steel Nonstructural Framing, 2020 Edition
R702.3.3
AISI S230—19: North American Standard for Cold-Formed Steel Framing—Prescriptive Method for One and Two Family Dwellings, 2019 Edition
CRC § 3.1 High relevance — show source text
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REFERENCED STANDARDS
C1261—2013(2017)E1: Specification for Firebox Brick for Residential Fireplaces
R1001.5, R1001.8
C1278/C1278M—2017: Specification for Fiber-Reinforced Gypsum Panels R702.3.1, R702.3.7, Table R702.4.2, Table R906.2
C1280—18: Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing Table R602.3(1)
C1283—2015(2021): Practice for Installing Clay Flue Lining
R1003.9.1, R1003.12
C1288—2017: Standard Specification for Fiber-Cement Interior Substrate Sheets Table R503.2.1.1(1), Table R503.2.1.1(2), Table R602.3(2), Table R702.4.2
C1289—22: Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board R303.8, Table R703.15.1, Table R703.15.2, Table R703.16.1, Table R703.16.2, Table R906.2
C1325—21: Standard Specification for Fiber-Mat Reinforced Cementitious Backer Units
Table R702.4.2
C1328/C1328M—19: Specification for Plastic (Stucco) Cement
R702.2.2, R703.7.2
C1364—19: Standard Specification for Architectural Cast Stone
R606.2.5
C1396/C1396M—2017: Specification for Gypsum Board Table R602.3(1), R702.2.1, R702.2.2, R702.3.1, R702.3.7
C1405—20a: Standard Specification for Glazed Brick (Single Fired, Brick Units)
R606.2.2
C1492—2003(2016): Specification for Concrete Roof Tile
R905.3.5
C1513—2018: Standard Specification for Steel Tapping Screws for Cold-Formed Steel Framing Connections R505.2.5, R603.2.5, R702.3.5.1, Table R703.3(2), Table R703.16.1, Table R703.16.2, R804.2.5
C1634—20: Standard Specification for Concrete Facing Brick and Other Concrete Masonry Facing Units
R606.2.1
C1658/C1658M—19e1: Standard Specification for Glass Mat Gypsum Panels
R702.3.1
C1670/1670M—21b: Standard Specification for Adhered Manufactured Stone Masonry Veneer Units
R606.2.6
C1691—2021: Standard Specification for Unreinforced Autoclaved Aerated Concrete (AAC) Masonry Units
R606.2.3
C1693—2011(2017): Standard Specification for Autoclaved Aerated Concrete (AAC)
R606.2.3
C1766—2015(2019): Standard Specification for Factory-Laminated Gypsum Panel Products
R702.3.1
CRC § 2.4 High relevance — show source text
R606.2.4
C578—19: Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation R403.3, Table R703.8.4(2), Table R703.15.1, Table R703.15.2, Table R703.16.1, Table R703.16.2, Table R906.2
C587—2004(2018): Specification for Gypsum Veneer Plaster
R702.2.1
C595/C595M—21: Specification for Blended Hydraulic Cements
R608.5.1.1, R702.2.2, R703.7.2
C615/C615M—2018E1: Standard Specification for Granite Dimension Stone
R606.2.4
C616/C616M—2015: Standard Specification for Quartz-Based Dimension Stone
R606.2.4
C629/C629M—2015: Standard Specification for Slate Dimension Stone
R606.2.4
C631—09(2020): Standard Specification for Bonding Compounds for Interior Gypsum Plastering
R702.2.1
C645—2018: Specification for Nonstructural Steel Framing Members
R702.3.3
C652—21: Specification for Hollow Brick (Hollow Masonry Units Made from Clay or Shale) R202, Table R301.2(1), R606.2.2
C685/C685M—2017: Specification for Concrete Made by Volumetric Batching and Continuous Mixing
R404.1.3.3.2, R608.5.1.2
C726—2017: Standard Specification for Mineral Wool Roof Insulation Board
Table R906.2
C728—2017A: Standard Specification for Perlite Thermal Insulation Board
Table R906.2
C744—2021: Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units
R606.2.1
C836/C836M—2018(2022): Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course
R905.14.2
C841—2003(2018): Standard Specification for Installation of Interior Lathing and Furring
R702.2.1
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REFERENCED STANDARDS
C842—05(2021): Standard Specification for Application of Interior Gypsum Plaster
R702.2.1
C843—2017: Specification for Application of Gypsum Veneer Plaster
R702.2.1
C844—2015(2021): Specification for Application of Gypsum Base to Receive Gypsum Veneer Plaster
R702.2.1
C847—18: Specification for Metal Lath
R702.2.1, R702.2.2
C887—20: Specification for Packaged, Dry, Combined Materials for Surface Bonding Mortar
R406.1, R606.2.9
C897—15(2020): Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters
R702.2.2
C920—2018: Standard Specification for Elastomeric Joint Sealants
R406.4.1
CRC § 722.5.1.4.4 High relevance — show source text
722.5.1.4.4 Minimum precast concrete cover. For structural steel columns protected with precast concrete column covers as shown in Figure 722.5.1(6), illustration (a), Tables 722.5.1(9) and 722.5.1(10) indicate the thickness of the column covers required for various fire-resistance ratings for typical wide-flange shapes. The thicknesses of concrete given in these tables apply to structural steel columns larger than those specified.
722.5.1.4.5 Masonry protection. The fire resistance of structural steel columns protected with concrete masonry units or clay masonry units as illustrated in Figure 722.5.1(7) shall be permitted to be determined from the following expression: Equation 7-16 R = 0.17 ( W/D) [0.7] + [0.285 ( T e 1.6 / K 0.2 )] [1.0 + 42.7 {( A s /d m T e )/(0.25p + T e )} 0.8 ]
where:
R = Fire-resistance rating of column assembly (hours).
W = Average weight of structural steel column (pounds per foot).
D = Heated perimeter of structural steel column (inches) [see Figure 722.5.1(7)].
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FIRE AND SMOKE PROTECTION FEATURES
T e = Equivalent thickness of concrete or clay masonry unit (inches) (see Table 722.3.2, Note a or Section 722.4.1).
K = Thermal conductivity of concrete or clay masonry unit (Btu/hr × ft × °F) [see Table 722.5.1(3)].
A s = Cross-sectional area of structural steel column (square inches). d m = Density of the concrete or clay masonry unit (pounds per cubic foot).
p = Inner perimeter of concrete or clay masonry protection (inches) [see Figure 722.5.1(7)].
722.5.1.4.6 Equivalent concrete masonry thickness. For structural steel columns protected with concrete masonry, Table 722.5.1(5) gives the equivalent thickness of concrete masonry required for various fire-resistance ratings for typical column shapes. For structural steel columns protected with clay masonry, Table 722.5.1(6) gives the equivalent thickness of concrete masonry required for various fire-resistance ratings for typical column shapes.
722.5.2 Structural steel beams and girders. The fire-resistance ratings of structural steel beams and girders shall be based on the size of the element and the type of protection provided in accordance with this section.
FIGURE 722.5.2—DETERMINATION OF THE HEATED PERIMETER OF STRUCTURAL STEEL BEAMS AND GIRDERS
CRC § 1.3.5.1 High relevance — show source text
A996M—2016: Specifications for Rail-Steel and Axle-Steel Deformed Bars for Concrete Reinforcement R403.1.3.5.1, Table R404.1.3.2(9), R404.1.3.3.7.1, R608.5.2.1, Table R608.5.4(2)
A1003/A1003M—15: Standard Specification for Steel Sheet, Carbon, Metallic and Nonmetallic-Coated for Cold-Formed Framing Members
R505.2.1, R505.2.2, R603.2.1, R603.2.2, R804.2.1, R804.2.2
B101—12(2019): Specification for Lead-Coated Copper Sheet and Strip for Building Construction Table R905.2.8.2, Table R905.10.3(1)
B209—21: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate Table R905.10.3(1)
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REFERENCED STANDARDS
B370—12(2019): Specification for Copper Sheet and Strip for Building Construction Table R905.2.8.2, Table R905.10.3(1)
B695—2021: Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
Table R507.2.3
C5—2018: Specification for Quicklime for Structural Purposes
R702.2.1
C22/C22M—00(2021): Specification for Gypsum
R702.2.1, R702.3.1
C27—1998(2018): Specification for Standard Classification of Fireclay and High-Alumina Refractory Brick
R1001.5
C28/C28M—10(2020): Specification for Gypsum Plasters
R702.2.1
C33/C33M—2018: Specification for Concrete Aggregates
R403.4.1
C34—2017: Standard Specification for Structural Clay Loadbearing Wall Tile Table R301.2(1), R606.2.2
C35/C35M—01(2019): Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster
R702.2.1
C55—2017: Specification for Concrete Building Brick R202, Table R301.2(1), R606.2.1
C56—2013(2017): Standard Specification for Structural Clay Nonloadbearing Tile
R606.2.2
C59/C59M—00(2020): Specification for Gypsum Casting Plaster and Molding Plaster
R702.2.1
C61/C61M—00(2020): Specification for Gypsum Keene’s Cement
R702.2.1
C62—2017: Standard Specification for Building Brick (Solid Masonry Units Made from Clay or Shale) R202, Table R301.2(1), R606.2.2
C73—2017: Specification for Calcium Silicate Brick (Sand-Lime Brick) R202, Table R301.2(1), R606.2.1
C90—21: Specification for Loadbearing Concrete Masonry Units Table R301.2(1), R606.2.1
CRC § 7-11 High relevance — show source text
where:
R = The fire-resistance rating of the assembly (hours).
R 1 , R 2 and R n = The fire-resistance rating of the individual wythes (hours). Values for R n0.59 for use in Equation 7-11 are given in Table 722.4.1(3).
722.4.2.1 Multiwythe walls of different material. For walls that consist of two or more wythes of different materials (concrete or concrete masonry units) in combination with clay masonry units, the fire-resistance rating of the different materials shall be permitted to be determined from Table 722.2.1.1 for concrete; Table 722.3.2 for concrete masonry units or Table 722.4.1(1) or Table 722.4.1(2) for clay and tile masonry units.
722.4.3 Reinforced clay masonry lintels. Fire-resistance ratings for clay masonry lintels shall be determined based on the nominal width of the lintel and the minimum covering for the longitudinal reinforcement in accordance with Table 722.4.1(5).
722.4.4 Reinforced clay masonry columns. The fire-resistance ratings shall be determined based on the last plan dimension of the column in accordance with Table 722.4.1(6). The minimum cover for longitudinal reinforcement shall be 2 inches (51 mm).
722.5 Steel assemblies. The provisions of this section contain procedures by which the fire-resistance ratings of steel assemblies are established by calculations.
722.5.1 Structural steel columns. The fire-resistance ratings of structural steel columns shall be based on the size of the element and the type of protection provided in accordance with this section.
TABLE 722.5.1(1)—W/D RATIOS FOR STEEL COLUMNS Col2 Col3 STRUCTURAL SHAPE CONTOUR PROFILE BOX PROFILE W14 × 233 2.55 3.65 × 211 2.32 3.35 × 193 2.14 3.09 × 176 1.96 2.85 × 159 1.78 2.60 × 145 1.64 2.39 × 132 1.56 2.25 × 120 1.42 2.06 × 109 1.29 1.88 × 99 1.18 1.72 × 90 1.08 1.58 × 82 1.23 1.68 × 74 1.12 1.53 × 68 1.04 1.41 × 61 0.928 1.28 × 53 0.915 1.21 × 48 0.835 1.10 × 43 0.752 0.99 W12 × 190 2.50 3.51 × 170 2.26 3.20 × 152 2.04 2.90 × 136 1.86 2.63 2025 CALIFORNIA BUILDING CODE 7-79
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FIRE AND SMOKE PROTECTION FEATURES
|TABLE 722.5.
CRC § 1.1 Medium relevance — show source text
R606.1.1 Professional registration not required. Where the provisions of TMS 403 or the provisions of this section are used to design masonry, project drawings, typical details and specifications shall not exempt construction documents from the require- ment to be stamped by a California licensed architect or engineer. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537.1 and 6737.1.
R606.2 Masonry construction materials.
R606.2.1 Concrete masonry units. Concrete masonry units shall conform to the following standards: ASTM C55 for concrete brick; ASTM C73 for calcium silicate face brick; ASTM C90 for load-bearing concrete masonry units; ASTM C744 for prefaced concrete and calcium silicate masonry units; or ASTM C1634 for concrete facing brick.
R606.2.2 Clay or shale masonry units. Clay or shale masonry units shall conform to the following standards: ASTM C34 for structural clay load-bearing wall tile; ASTM C56 for structural clay nonload-bearing wall tile; ASTM C62 for building brick (solid masonry units made from clay or shale); ASTM C126 for ceramic-glazed structural clay facing tile, facing brick and solid masonry units; ASTM C212 for structural clay facing tile; ASTM C216 for facing brick (solid masonry units made from clay or shale); ASTM C652 for hollow brick (hollow masonry units made from clay or shale); ASTM C1088 for solid units of thin veneer brick; or ASTM C1405 for glazed brick (single-fired solid brick units).
Exception: Structural clay tile for nonstructural use in fireproofing of structural members and in wall furring shall not be required to meet the compressive strength specifications. The fire-resistance rating shall be determined in accordance with ASTM E119 or UL 263 and shall comply with the requirements of Section R302.
R606.2.3 AAC masonry. AAC masonry units shall conform to ASTM C1691 and ASTM C1693 for the strength class specified.
R606.2.4 Stone masonry units. Stone masonry units shall conform to the following standards: ASTM C503 for marble building stone (exterior); ASTM C568M for limestone building stone; ASTM C615 for granite building stone; ASTM C616 for sandstone building stone; or ASTM C629 for slate building stone.
R606.2.5 Architectural cast stone. Architectural cast stone shall conform to ASTM C1364.
R606.2.6 Adhered manufactured stone masonry veneer units. Adhered manufactured stone masonry veneer units shall conform to ASTM C1670.
R606.2.7 Second-hand units. Second-hand masonry units shall not be reused unless they conform to the requirements of new units. The units shall be of whole, sound materials and free from cracks and other defects that will interfere with proper laying or use. Old mortar shall be cleaned from the unit before reuse.
R606.2.8 Mortar. Except for mortars listed in Sections R606.2.9, R606.2.10 and R606.2.11, mortar for use in masonry construction shall meet the proportion specifications of Table R606.2.8 or the property specifications of ASTM C270. The type of mortar shall be in accordance with Sections R606.2.8.1, R606.2.8.2 and R606.2.8.3.
2025 CALIFORNIA RESIDENTIAL CODE 6-93
CRC § 4.4 Medium relevance — show source text
Requirements for installation of masonry veneer, stucco and other finishes on the exterior of concrete walls and other construction details not covered in this section shall comply with the requirements of this code.
R608.4.4 Flat ICF wall systems. Flat ICF wall system forms shall conform to ASTM E2634.
R608.5 Materials. Materials used in the construction of concrete walls shall comply with this section.
R608.5.1 Concrete and materials for concrete. Materials used in concrete, and the concrete itself, shall conform to requirements of this section, PCA 100, ACI 318 or ACI 332.
R608.5.1.1 Cements. The following standards as referenced in Chapter 44 shall be permitted to be used:
ASTM C150.
ASTM C595.
ASTM C1157.
R608.5.1.2 Concrete mixing and delivery. Mixing and delivery of concrete shall comply with ASTM C94 or ASTM C685.
6-110 2025 CALIFORNIA RESIDENTIAL CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
WALL CONSTRUCTION
R608.5.1.3 Maximum aggregate size. The nominal maximum size of coarse aggregate shall not exceed one-fifth the narrowest distance between sides of forms, or three-fourths the clear spacing between reinforcing bars or between a bar and the side of the form.
Exception: When approved, these limitations shall not apply where removable forms are used and workability and methods of consolidation permit concrete to be placed without honeycombs or voids.
R608.5.1.4 Proportioning and slump of concrete. Proportions of materials for concrete shall be established to provide workability and consistency to permit concrete to be worked readily into forms and around reinforcement under conditions of placement to be employed, without segregation or excessive bleeding. Slump of concrete placed in removable forms shall not exceed 6 inches (152 mm).
Exception: When approved, the slump is permitted to exceed 6 inches (152 mm) for concrete mixtures that are resistant to segregation, and are in accordance with the form manufacturer’s recommendations.
Slump of concrete placed in stay-in-place forms shall exceed 6 inches (152 mm). Slump of concrete shall be determined in accordance with ASTM C143.
R608.5.1.5 Compressive strength. The minimum specified compressive strength of concrete, f ’ c, shall comply with Section R402.2 and shall be not less than 2,500 pounds per square inch (17.2 MPa) at 28 days.
R608.5.1.6 Consolidation of concrete. Concrete shall be consolidated by suitable means during placement and shall be worked around embedded items and reinforcement and into corners of forms. Where stay-in-place forms are used, concrete shall be consolidated by internal vibration.
Exception: When approved, self-consolidating concrete mixtures with slumps equal to or greater than 8 inches (203 mm) that are specifically designed for placement without internal vibration need not be internally vibrated.
R608.5.2 Steel reinforcement and anchor bolts.
R608.5.2.1 Steel reinforcement. Steel reinforcement shall comply with ASTM A615, ASTM A706, or ASTM A996M. ASTM A996M bars produced from rail steel shall be Type R.
Frequently asked questions
What is a "referenced standard" in the CRC?
A referenced standard is a technical standard (ASTM, ACI, TMS, AISI, etc.) that the CRC explicitly incorporates by citation; Chapter 44 lists every referenced standard and the CRC sections that rely on each one .
Where are masonry unit specifications found in the CRC?
Masonry unit and mortar requirements are in §R606 (e.g., §R606.2 lists the ASTM standards for concrete and clay masonry units and §R606.2.8 covers mortar), with the code pointing to the specific ASTM/TMS standards in Chapter 44 .
Do I need to use ACI or AISC documents for structural design?
Yes — where the CRC references those documents (for example ACI 318 for concrete and AISC/AISI guidance for steel/cold‑formed steel), the referenced standard provides the technical design rules to be followed for those elements as cited in the CRC sections and Chapter 44 .
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