CRC · California Residential Code

Footings (sizes, depths, reinforcement)

This hub summarizes CRC requirements for footing sizes, minimum depths (including frost protection) and required reinforcement.

Last reviewed: July 6, 2026

Overview

This hub covers the California Residential Code (CRC) rules for footing geometry, depths and required reinforcement for foundations supporting exterior walls, stem walls, piers and columns. The rules are found in Chapter 4 (Section R403—Footings) and include minimum widths and thicknesses (see § R403.1.1 and Tables R403.1(1)–(3)) as well as general footing provisions and design references such as ACI 332 . For minimum dimensions and when to use the tabulated footing sizes, consult § R403.1.1 and the associated tables .

Depth and frost-protection requirements (minimum embedment, frost-line rules and exceptions) are addressed in § R403.1.4 and § R403.1.4.1, while minimum reinforcement and placement, cover and lap-splice rules for seismic regions are given in § R403.1.3 and § R403.1.3.5 (Seismic Design Categories D0, D1 and D2) . The CRC also permits plain isolated footings for typical detached one- and two-family dwellings under limited conditions; see § R403.1.3.6 for that allowance .

In this section

Code references

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

  • CRC § 2.3 High relevance — show source text

    FINISH GRADE SLOPE [1] / 2 IN. PER FOOT, MIN. 6 FT. FROM WALL

    16 IN.

    PRESSURE-PRESERVATIVE TREATED 2 � 6 IN. STUD WALL

    PRESSURE-PRESERVATIVE TREATED PLYWOOD (SEE TABLE R404.2.3)

    PRESSURE-PRESERVATIVE TREATED 2 � 6 IN. BOTTOM PLATE

    PRESSURE-PRESERVATIVE TREATED 2 � 8 IN. FOOTING PLATE

    BELOW FROST LINE

    2025 CALIFORNIA RESIDENTIAL CODE 4-11

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    FOUNDATIONS

    R403.1.1 Minimum size. The minimum width, W, and thickness, T, for concrete footings shall be in accordance with Tables R403.1(1) through R403.1(3) and Figure R403.1(1) or R403.1.3, as applicable, but not less than 12 inches (305 mm) in width and 6 inches (152 mm) in depth. The footing width shall be based on the load-bearing value of the soil in accordance with Table R401.4.1(1). Footing projections, P, shall be not less than 2 inches (51 mm) and shall not exceed the thickness of the footing. Footing thickness and projection for fireplaces shall be in accordance with Section R1001.2. The size of footings supporting piers and columns shall be based on the tributary load and allowable soil pressure in accordance with Table R401.4.1(1). Footings for wood foundations shall be in accordance with the details set forth in Section R403.2, and Figures R403.1(2) and R403.1(3). Footings for precast foundations shall be in accordance with the details set forth in Section R403.4, Table R403.4, and Figures R403.4(1) and R403.4(2). Crushed stone footings for cast-in-place concrete foundations shall be in accordance with Section R403.5.

    R403.1.2 Continuous footing in Seismic Design Categories D 0 , D 1 and D 2 . Exterior walls and required interior braced wall panels of buildings located in Seismic Design Categories D 0, D 1 and D 2 shall be supported by continuous solid or fully grouted masonry or concrete footings in accordance with Table R403.1.2. Other footing materials or systems shall be designed in accordance with accepted engineering practice.

    TABLE R403.1.2—CONTINUOUS FOOTING REQUIREMENTS IN SEISMIC DESIGN CATEGORIES D, D AND D
    0 1 2
    Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 Col10 Col11 Col12 Col13 Col14 Col15
    **BUILDING PLAN
  • CRC § 1.4 High relevance — show source text

    TOP OF FOOTING MIN. 4 IN.

    BELOW UNDISTURBED GROUND

    SURFACE

    12 IN. MIN. FOOTING DEPTH PER

    SECTION R403.1.4

    AREA OF EXTENDED CRUSHED

    STONE FOOTING DEPTH AT

    WIDTH 'W' TO BELOW FROST

    LINE WHERE APPLICABLE

    NOT TO SCALE

    For SI: 1 inch = 25.4 mm, 1 foot = 304.5 mm.

    2025 CALIFORNIA RESIDENTIAL CODE 4-23

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    FOUNDATIONS

    FIGURE R403.5(3)—CRUSHED STONE FOOTINGS FOR CAST-IN-PLACE CONCRETE FOUNDATIONS IN SEISMIC DESIGN CATEGORIES A, B, AND C AND WIND EXPOSURE CATEGORIES B, C, AND D: CONCRETE SLAB-ON-GROUND WITH TURNED DOWN FOUNDATION

    SILL PLATE AND ANCHORAGE

    PER SECTION R403.5 ANCHORS

    WITH 7" MIN. EMBEDMENT

    MIN. CLEARANCE PER

    SECTIONS R404.1.6 AND

    R304.1 TYP.

    TOP OF FOOTING MIN. 4 IN.

    BELOW UNDISTURBED GROUND

    SURFACE

    12 IN. MIN. FOOTING DEPTH PER

    SECTION R403.1.4

    GREATER DEPTH FOR FROST

    PROTECTION WHERE

    APPLICABLE PER SECTION

    R403.1.4.1

    NOT TO SCALE

    For SI: 1 inch = 25.4 mm, 1 foot = 304.5 mm.

    TABLE R403.5—MINIMUM CAST-IN-PLACE CONCRETE FOUNDATION WALL
    DIMENSIONS, REINFORCEMENT AND MAXIMUM BRACED WALL LINE SPACING
    Col2 Col3 Col4 Col5
    WIND
    EXPOSURE
    CATEOGRY
    ULTIMATE DESIGN
    WIND SPEED
    (miles per hour)
    MINIMUM STEM
    WALL WIDTH
    (inches)
    MI
    W
    NIMUM STEM
    ALL HEIGHT
    (inches)
    MINIMUM
    HORIZONTAL
    REBAR
    MAXIMUM BRACED
    WALL LINE SPACING
    (feet)
    B < 140 6 12
    (2) - #4
    28
    C and D < 140 8 18
    (3) - #4
    25
    For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mph = 0.447 m/s. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mph = 0.447 m/s. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mph = 0.447 m/s. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mph = 0.447 m/s. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mph = 0.447 m/s.
  • CRC § 304.8 High relevance — show source text

    The height of cripple walls does not exceed 4 feet.
    2. First-floor braced wall panels are supported on doubled floor joists, continuous blocking or floor beams.
    3. The distance between bracing lines does not exceed twice the building width measured parallel to the braced wall line.|For SI: 1 foot = 304.8 mm.
    R = Continuous solid or fully grouted masonry or concrete footings in accordance with Section R403.1.3.4 required.
    NR = Continuous footings not required.
    a. Buildings shall be permitted to have interior braced wall panels supported on continuous foundations at intervals not exceeding 50 feet, provided that the following condi-
    tions are all met:
    1. The height of cripple walls does not exceed 4 feet.
    2. First-floor braced wall panels are supported on doubled floor joists, continuous blocking or floor beams.
    3. The distance between bracing lines does not exceed twice the building width measured parallel to the braced wall line.|For SI: 1 foot = 304.8 mm.
    R = Continuous solid or fully grouted masonry or concrete footings in accordance with Section R403.1.3.4 required.
    NR = Continuous footings not required.
    a. Buildings shall be permitted to have interior braced wall panels supported on continuous foundations at intervals not exceeding 50 feet, provided that the following condi-
    tions are all met:
    1. The height of cripple walls does not exceed 4 feet.
    2. First-floor braced wall panels are supported on doubled floor joists, continuous blocking or floor beams.
    3. The distance between bracing lines does not exceed twice the building width measured parallel to the braced wall line.|

    R403.1.3 Footing and stem wall reinforcing in Seismic Design Categories D 0 , D 1 and D 2 . Concrete footings located in Seismic Design Categories D 0, D 1 and D 2, as established in Table R301.2, shall have minimum reinforcement in accordance with this section and Figure R403.1.3. Reinforcement shall be installed with support and cover in accordance with Section R403.1.3.5.

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    FOUNDATIONS

    FIGURE R403.1.3—REINFORCED CONCRETE FOOTINGS AND MASONRY AND CONCRETE STEM WALLS IN SDC D 0 , D 1 AND D 2a, b, c, d, e, f

    W = Width of footing, T = Thickness of footing and P = Projection per Section R403.1.1.

    NOTES:

    a. See Section R404.3 for sill requirements. b. See Section R403.1.6 for sill attachment.

    c. See Section R506.3.3 for vapor barrier requirements. d. See Section R403.1 for base.

    e. See Section R408 for under-floor ventilation and access requirements. f. See Section R403.1.3.5 for reinforcement requirements.

    2025 CALIFORNIA RESIDENTIAL CODE 4-13

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    FOUNDATIONS

  • CRC § 2.3 High relevance — show source text

    2 � 6 IN. STUD INSULATED

    AS APPROPRIATE AND WARM SIDE

    VAPOR BARRIER

    FINISH GRADE SLOPE [1] / 2 IN. PER FOOT, MIN. 6 FT. FROM WALL

    PRESSURE-PRESERVATIVETREATED PLYWOOD (SEE TABLE R404.2.3)

    6 MIL POLYETHYLENE FILM

    6 MIL POLYETHYLENE FILM ON CRUSHED STONE OR GRAVEL BACKFILL

    PRESSURE-PRESERVATIVE TREATED 2 � 6 IN. BOTTOM

    Col1 2-IN. AIR GAP
    . BACKFILL) 2-IN. AIR GAP
    4 IN.
    1-IN.-THICK PRESSURE
    TREATED LUMBER OR
    PROTECTING TOP OF P
    PRESS
    TREAT
    PLATE
    PRES
    TREA
    PLATE
    .
    HED
    4 IN.
    16 IN
    HED
    4 IN.
    16 IN

    STONE FILL UNDER FLOOR (SEE SECTION R403.2)

    6 IN.

    For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm.

    FIGURE R403.1(3)—PERMANENT WOOD FOUNDATION CRAWL SPACE SECTION

    PRESSURE-PRESERVATIVE TREATED

    6 MIL POLYETHYLENE FILM

    6 IN.

    6 IN. GRAVEL OR CRUSHED STONE (SEE SECTION R403.2)

    For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm.

    FINISH GRADE SLOPE [1] / 2 IN. PER FOOT, MIN. 6 FT. FROM WALL

    16 IN.

    PRESSURE-PRESERVATIVE TREATED 2 � 6 IN. STUD WALL

    PRESSURE-PRESERVATIVE TREATED PLYWOOD (SEE TABLE R404.2.3)

    PRESSURE-PRESERVATIVE TREATED 2 � 6 IN. BOTTOM PLATE

    PRESSURE-PRESERVATIVE TREATED 2 � 8 IN. FOOTING PLATE

    BELOW FROST LINE

    2025 CALIFORNIA RESIDENTIAL CODE 4-11

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    FOUNDATIONS

    R403.1.1 Minimum size. The minimum width, W, and thickness, T, for concrete footings shall be in accordance with Tables R403.1(1) through R403.1(3) and Figure R403.1(1) or R403.1.3, as applicable, but not less than 12 inches (305 mm) in width and 6 inches (152 mm) in depth. The footing width shall be based on the load-bearing value of the soil in accordance with Table R401.4.1(1). Footing projections, P, shall be not less than 2 inches (51 mm) and shall not exceed the thickness of the footing. Footing thickness and projection for fireplaces shall be in accordance with Section R1001.2. The size of footings supporting piers and columns shall be based on the tributary load and allowable soil pressure in accordance with Table R401.4.1(1).

  • CRC § 1.3.5 High relevance — show source text

    R403.1.3.5 Reinforcement. Footing and stem wall reinforcement shall comply with Sections R403.1.3.5.1 through R403.1.3.5.4.

    R403.1.3.5.1 Steel reinforcement. Steel reinforcement shall comply with the requirements of ASTM A615, A706M or A996M. ASTM A996M bars produced from rail steel shall be Type R. The minimum yield strength of reinforcing steel shall be 40,000 psi (Grade 40) (276 MPa).

    R403.1.3.5.2 Location of reinforcement in wall. The center of vertical reinforcement in stem walls shall be located at the centerline of the wall. Horizontal and vertical reinforcement shall be located in footings and stem walls to provide the minimum cover required by Section R403.1.3.5.3.

    R403.1.3.5.3 Support and cover. Reinforcement shall be secured in the proper location in the forms with tie wire or other bar support system to prevent displacement during the concrete placement operation. Steel reinforcement in concrete cast against the earth shall have a minimum cover of 3 inches (75 mm). Minimum cover for reinforcement in concrete cast in removable forms that will be exposed to the earth or weather shall be 1 [1] / 2 inches (38 mm) for No. 5 bars and smaller, and 2 inches (50 mm) for No. 6 bars and larger. For concrete cast in removable forms that will not be exposed to the earth or weather, and for concrete cast in stay-in-place forms, minimum cover shall be [3] / 4 inch (19 mm).

    R403.1.3.5.4 Lap splices. Vertical and horizontal reinforcement shall be the longest lengths practical. Where splices are necessary in reinforcement, the length of lap splice shall be in accordance with Table R608.5.4(1) and Figure R608.5.4(1). The maximum gap between noncontact parallel bars at a lap splice shall not exceed the smaller of one-fifth the required lap length and 6 inches (152 mm) [see Figure R608.5.4(1)].

    R403.1.3.6 Isolated concrete footings. In detached one- and two-family dwellings that are three stories or less in height and constructed with stud bearing walls, isolated plain concrete footings supporting columns or pedestals are permitted.

    R403.1.4 Minimum depth. Exterior footings shall be placed not less than 12 inches (305 mm) below the undisturbed ground surface. Where applicable, the depth of footings shall also conform to Section R403.1.4.1. Deck footings shall be in accordance with Section R507.3.

    R403.1.4.1 Frost protection. Except where otherwise protected from frost, foundation walls, piers and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods:

    1. Extended below the frost line specified in Table R301.2.

    2. Constructed in accordance with Section R403.3.

    3. Constructed in accordance with ASCE 32.

    4. Erected on solid rock.

    Footings shall not bear on frozen soil unless the frozen condition is permanent.

  • CRC § 19.1 Medium relevance — show source text
    1. Structural reinforcing steel shall meet the requirements of ASTM A615, A706M or A996M. The minimum yield strength of reinforcing steel shall be 40,000 psi (Grade 40) (276 MPa). Steel reinforcement for precast concrete foundation walls shall have a minimum concrete cover of [3] / 4 inch (19.1 mm).

    2. Panel-to-panel connections shall be made with Grade II steel fasteners.

    3. The use of nonstructural fibers shall conform to ASTM C1116.

    4. Grout used for bedding precast foundations placed on concrete footings shall meet ASTM C1107.

    R402.4 Masonry. Masonry systems shall be designed and installed in accordance with this chapter and shall have a minimum specified compressive strength of 1,500 psi (10.3 MPa).

    SECTION R403—FOOTINGS

    R403.1 General. All exterior walls shall be supported on continuous solid or fully grouted masonry or concrete footings, crushed stone footings, wood foundations, or other approved structural systems that shall be of sufficient design to accommodate all loads according to Section R301 and to transmit the resulting loads to the soil within the limitations as determined from the character of the soil. Footings shall be supported on undisturbed natural soils or engineered fill. Concrete footing shall be designed and constructed in accordance with the provisions of Section R403 or in accordance with ACI 332.

    TABLE R403.1(1)—MINIMUM WIDTH AND THICKNESS FOR
    CONCRETE FOOTINGS FOR LIGHT-FRAME CONSTRUCTION (inches)a, b, c, d
    Col2 Col3 Col4 Col5 Col6 Col7 Col8
    ** GROUND SNOW LOAD**
    OR ROOF LIVE LOAD
    ** STORY AND TYPE OF**
    STRUCTURE WITH LIGHT
    FRAME
    ** LOAD-BEARING VALUE OF SOIL (psf)** ** LOAD-BEARING VALUE OF SOIL (psf)** ** LOAD-BEARING VALUE OF SOIL (psf)** ** LOAD-BEARING VALUE OF SOIL (psf)** ** LOAD-BEARING VALUE OF SOIL (psf)** ** LOAD-BEARING VALUE OF SOIL (psf)**
    ** GROUND SNOW LOAD**
    OR ROOF LIVE LOAD
    ** STORY AND TYPE OF**
    STRUCTURE WITH LIGHT
    FRAME
    ** 1,500** ** 2,000** ** 2,500** ** 3,000** ** 3,500** ** 4,000**
    20 psf roof live load or 25 psf
    ground snow load
    1 story—slab-on-grade 12 × 6 12 × 6 12 × 6 12 × 6 12 × 6 12 × 6
    20 psf roof live load or 25 psf
    ground snow load
    1 story—with crawl space 12 × 6 12 × 6 12 × 6 12 × 6 12 × 6 12 × 6
    20 psf roof live load or 25 psf
    ground snow load
    1 story—plus basement 16 × 6 12 × 6 12 × 6 12 × 6 12 × 6 12 × 6
    20 psf roof live load or 25 psf
    ground snow load
    2 story—slab-on-grade 13 × 6 12 ×
  • CRC § 1.10. Medium relevance — show source text

    If the
    increased span exceeds the allowable clear span for a lintel of the same depth and loading condition with stirrups, the top and bottom reinforcement shall be equal to or
    greater than that required for a lintel of the same depth and loading condition that has an allowable clear span that is equal to or greater than that of the lintel without stir-
    rups that has been increased.
    k. Center distance,A, is the center portion of the clear span where stirrups are not required. This is applicable to all longitudinal bar sizes and steel yield strengths.
    l. Where concrete with a minimum specified compressive strength of 3,000 psi is used, center distance,A, shall be permitted to be multiplied by 1.10.
    m.The maximum clear opening width between two solid wall segments shall be 18 feet. See Section R608.7.2.1. Lintel clear spans in the table greater than 18 feet are shown for
    interpolation and information only.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 pound per square foot = 0.0479 kPa, Grade 40 = 280 MPa, Grade 60 = 420 MPa.
    a. See Table R608.3 for tolerances permitted from nominal thickness.
    b. Table values are based on concrete with a minimum specified compressive strength of 2,500 psi. See Note j.
    c. Table values are based on uniform loading. See Section R608.8.2 for lintels supporting concentrated loads.
    d. Deflection criterion is_L_/240, where_L_ is the clear span of the lintel in inches, or1/2 inch, whichever is less.
    e. Linear interpolation is permitted between ground snow loads and between lintel depths.
    f. DR indicates design required.
    g. Lintel depth,D, is permitted to include the available height of wall located directly above the lintel, provided that the increased lintel depth spans the entire length of the
    lintel.
    h. Stirrups shall be fabricated from reinforcing bars with the same yield strength as that used for the main longitudinal reinforcement.
    i. Allowable clear span without stirrups applicable to all lintels of the same depth,D. Top and bottom reinforcement for lintels without stirrups shall be not less than the least
    amount of reinforcement required for a lintel of the same depth and loading condition with stirrups. All other spans require stirrups spaced at not more than_d_/2.
    j. Where concrete with a minimum specified compressive strength of 3,000 psi is used, clear spans for lintels without stirrups shall be permitted to be multiplied by 1.05. If the
    increased span exceeds the allowable clear span for a lintel of the same depth and loading condition with stirrups, the top and bottom reinforcement shall be equal to or
    greater than that required for a lintel of the same depth and loading condition that has an allowable clear span that is equal to or greater than that of the lintel without stir-
    rups that has been increased.
    k. Center distance,A, is the center portion of the clear span where stirrups are not required. This is applicable to all longitudinal bar sizes and steel yield strengths.
    l.

  • CRC § 1.05. Medium relevance — show source text

    Deflection criterion is_L_/240, where_L_ is the clear span of the lintel in inches, or1/2 inch, whichever is less.
    e. Linear interpolation is permitted between ground snow loads and between lintel depths.
    f. DR indicates design required.
    g. Lintel depth,D, is permitted to include the available height of wall located directly above the lintel, provided that the increased lintel depth spans the entire length of the
    lintel.
    h. Stirrups shall be fabricated from reinforcing bars with the same yield strength as that used for the main longitudinal reinforcement.
    i. Allowable clear span without stirrups applicable to all lintels of the same depth,D. Top and bottom reinforcement for lintels without stirrups shall be not less than the least
    amount of reinforcement required for a lintel of the same depth and loading condition with stirrups. All other spans require stirrups spaced at not more than_d_/2.
    j. Where concrete with a minimum specified compressive strength of 3,000 psi is used, clear spans for lintels without stirrups shall be permitted to be multiplied by 1.05. If the
    increased span exceeds the allowable clear span for a lintel of the same depth and loading condition with stirrups, the top and bottom reinforcement shall be equal to or
    greater than that required for a lintel of the same depth and loading condition that has an allowable clear span that is equal to or greater than that of the lintel without stir-
    rups that has been increased.
    k. Center distance,A, is the center portion of the clear span where stirrups are not required. This is applicable to all longitudinal bar sizes and steel yield strengths.
    l. Where concrete with a minimum specified compressive strength of 3,000 psi is used, center distance,A, shall be permitted to be multiplied by 1.10.
    m.The maximum clear opening width between two solid wall segments shall be 18 feet. See Section R608.7.2.1. Lintel clear spans in the table greater than 18 feet are shown for
    interpolation and information only.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 pound per square foot = 0.0479 kPa, Grade 40 = 280 MPa, Grade 60 = 420 MPa.
    a. See Table R608.3 for tolerances permitted from nominal thickness.
    b. Table values are based on concrete with a minimum specified compressive strength of 2,500 psi. See Note j.
    c. Table values are based on uniform loading. See Section R608.8.2 for lintels supporting concentrated loads.
    d. Deflection criterion is_L_/240, where_L_ is the clear span of the lintel in inches, or1/2 inch, whichever is less.
    e. Linear interpolation is permitted between ground snow loads and between lintel depths.
    f. DR indicates design required.
    g. Lintel depth,D, is permitted to include the available height of wall located directly above the lintel, provided that the increased lintel depth spans the entire length of the
    lintel.
    h. Stirrups shall be fabricated from reinforcing bars with the same yield strength as that used for the main longitudinal reinforcement.
    i.

  • CRC § 3-82 Medium relevance — show source text

    R336 Large Family Day-Care Homes . . . . . . . . . . . . . . . . . . . 3-82

    R337 Materials and Construction Methods for Exterior

    Wildfire Exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83

    R338 Electric Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83

    2025 CALIFORNIA RESIDENTIAL CODE xxi

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    CONTENTS

    R339 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84

    R340 Pollutant Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84

    CHAPTER 4 FOUNDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

    R401 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

    R402 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

    R403 Footings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

    R404 Foundation and Retaining Walls . . . . . . . . . . . . . . . . 4-24

    R405 Foundation Drainage . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

    R406 Foundation Waterproofing and Dampproofing . . . 4-43

    R407 Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

    R408 Under-Floor Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

    CHAPTER 5 FLOORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

    R501 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

    R502 Wood Floor Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

    R503 Floor Sheathing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

    R504 Pressure Preservative-Treated Wood

  • California Residential 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.

  • CRC § 8.8 Medium relevance — show source text

    **
    HOURS| |ITEM CODE|DEPTH|CONSTRUCTION DETAILS|LOAD|TIME|PRE-BMS-92|BMS-92|POST-BMS-92|POST-BMS-92|POST-BMS-92| |B-11-RC-1|11″|24″ wide × 11″ deep reinforced concrete “T”
    beam (3290 psi); details: see Note 5 figure.|8.8 tons|4 hrs
    2 min|||7|1, 2, 14|4| |B-10-RC-2|10″|24″ wide × 10″ deep reinforced concrete “T”
    beam (4370 psi); details: see Note 6 figure.|8.8 tons|1 hr
    53
    min|||7|1, 3|13/4| |B-10-RC-3|101/2″|24″ wide × 101/2″ deep reinforced concrete
    “T” beam (4450 psi); details: see Note 7
    figure.|8.8 tons|2 hrs
    40
    min|||7|1, 3|22/3| |B-11-RC-4|11″|24″ wide × 11″ deep reinforced concrete “T”
    beam (2400 psi); details: see Note 8 figure.|8.8 tons|3 hrs
    32
    min|||7|1, 3, 14|31/2| |B-11-RC-5|11″|24″ wide × 11″ deep reinforced concrete “T”
    beam (4250 psi); details: see Note 9 figure.|8.8 tons|3 hrs
    3 min|||7|1, 3, 14|3| |B-11-RC-6|11″|Concrete flange: 4″ deep × 2' wide (4895 psi)
    concrete; concrete beam: 7″ deep × 61/2″
    wide; “I” beam reinforcement; 10″ × 41/2″ ×
    25 lbs R.S.J.; 1″ cover on flanges; flange rein-
    forcement:3/8″ diameter bars at 6″ pitch
    parallel to “T”; 1/4″ diameter bars perpendic-
    ular to “T”; beam reinforcement: 4″ × 6″ No.
    13 SWG wire mesh; span: 11' restrained;
    details: see Note 10 figure.|10 tons|6 hrs|||7|1, 4|6| |B-11-RC-7|11″|Concrete flange: 6″ deep × 1' 61/2″ wide (3525
    psi) concrete; concrete beam: 5″ deep × 8″
    wide precast concrete blocks 83/4″ long; “I”
    beam reinforcement; 7″ × 4″ × 16 lbs R.S.J.

Frequently asked questions

What are the CRC minimum footing width and thickness?

Minimum concrete footing width and thickness are set by Tables R403.1(1)–(3) but in no case shall a footing be less than 12 inches wide and 6 inches deep; see § R403.1.1 for details and table lookup .

When does a footing require reinforcement and what are key placement rules?

Minimum reinforcement is required for footings in Seismic Design Categories D0, D1 and D2 per § R403.1.3; reinforcement material, cover, support and lap‑splice rules are in § R403.1.3.5 (ASTM A615/A706/A996, Grade 40 min., cover and splice requirements) file.

How deep must footings be for frost protection?

Exterior footings must be placed at least 12 inches below undisturbed ground and, where frost applies, extended below the frost line or otherwise protected per § R403.1.4 and § R403.1.4.1 .

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