CRC · California Residential Code

What are the CRC requirements for EIFS / exterior insulation and finish systems (EIFS)?

The CRC (§ R703.9) requires EIFS systems to meet ASTM E2568 and, except over concrete or masonry, to be the drained EIFS type with a WRB under the EIFS and tested drainage efficiency of at least 90%; flashings are required and EIFS must terminate at least 6 inches above finished grade.

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Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

Exterior Insulation and Finish Systems (EIFS) are regulated in § R703.9 of the California Residential Code; plain-English: EIFS must meet ASTM performance standards, be installed per manufacturer instructions, be flashed and terminated above grade, and where EIFS is applied over framed or sheathed walls it must be the drained EIFS meeting specific drainage and water‑resistive‑barrier rules. See § R703.9.1 (EIFS) and § R703.9.2 (EIFS with drainage) for the controlling requirements.

The single most important rule: EIFS must meet ASTM E2568 and, unless installed over concrete/masonry, be the drainage-type EIFS with a minimum 90% drainage efficiency and a compliant water‑resistive barrier applied between the EIFS and wall sheathing.

Requirements in detail

Use the subsections below to decide which set of rules apply to your wall assembly.

Definitions (first things first)

  • EIFS — nonstructural, nonload-bearing exterior claddings made of an insulation board, integrally reinforced base coat, and textured finish coat. See definition in § R202.
  • EIFS with drainage — an EIFS that incorporates a means of drainage applied over a water‑resistive barrier (WRB). See § R202 and § R703.9.2.

Which rule set applies?

  • If the substrate is concrete or masonry, the basic EIFS rules in § R703.9.1 apply.
  • If the substrate is anything else (typical framed walls with sheathing), EIFS with drainage is required; these additional drainage and WRB rules are in § R703.9.2.

Key mandatory items (short bullets)

  • Meet ASTM E2568 (performance / construction specification). § R703.9.1(1) and § R703.9.2(1).
  • For EIFS over framed/sheathing walls use EIFS with drainage and meet drainage testing per ASTM E2273 with minimum average drainage efficiency of 90%. § R703.9.2(3).
  • The water‑resistive barrier (WRB) for EIFS with drainage must comply with § R703.2 or ASTM E2570 and must be applied between the EIFS and the wall sheathing. § R703.9.2(4)–(5).
  • Flashing must be provided as required in § R703.4. § R703.9.1(3) and § R703.9.2(6).
  • Installation must follow the manufacturer’s instructions. § R703.9.1(4) and § R703.9.2(7).
  • EIFS (both types) must terminate not less than 6 inches (152 mm) above finished ground level. § R703.9.1(5) and § R703.9.2(8). 6 inches is a code threshold.
  • Decorative trim shall not be face‑nailed through the EIFS (both types). § R703.9.1(6) and § R703.9.2(9).

Decision table — at a glance

Dimension / question Required value / action Code Reference
Minimum performance spec for EIFS ASTM E2568 § R703.9.1(1), § R703.9.2(1)
When is drained EIFS required? Over all substrates except concrete/masonry § R703.9.2(2)
Drainage efficiency (drained EIFS) Average minimum 90% (ASTM E2273) § R703.9.2(3)
WRB for drained EIFS Comply with § R703.2 or ASTM E2570; applied between EIFS and sheathing § R703.9.2(4)–(5)
Flashing Provide flashing per § R703.4 § R703.9.1(3), § R703.9.2(6)
Termination above grade ≥ 6 inches (152 mm) above finished ground § R703.9.1(5), § R703.9.2(8)
Installation standard Manufacturer’s instructions (required) § R703.9.1(4), § R703.9.2(7)
Trim fastening Do not face‑nail decorative trim through EIFS § R703.9.1(6), § R703.9.2(9)

Notes on referenced test/standards

  • ASTM E2568 — EIFS performance/specification referenced by both EIFS provisions.
  • ASTM E2273 — drainage efficiency test referenced in § R703.9.2(3).
  • ASTM E2570 — WRB evaluation method referenced for EIFS with drainage in § R703.9.2(4).

Exceptions & special cases

  • The plain EIFS provisions in § R703.9.1 are limited to substrates of concrete or masonry wall assemblies; framed/sheathing substrates must use drained EIFS per § R703.9.2. § R703.9.1(2) and § R703.9.2(2).
  • The code does not itself supply additional attachment/furring details for cladding over foam sheathing beyond pointing to the EIFS sections; where foam sheathing and cladding attachment details are needed elsewhere, other CRC sections apply (see related provisions). If a provision you need is not in § R703.9, it’s because the CRC defers to manufacturer instructions and referenced ASTM standards.

If you need code language about WRB materials or flashing details beyond the high‑level requirements in § R703.9, those are covered elsewhere in Chapter 7 (for example § R703.2 for WRBs and § R703.4 for flashing) and are cited in the EIFS rules.

Common mistakes

  • Assuming standard (non‑drainage) EIFS is acceptable over framed/sheathing walls — the CRC requires EIFS with drainage on those substrates. § R703.9.2(2).
  • Omitting a tested WRB between EIFS and sheathing for drained systems or using an untested coating — § R703.9.2(4–5) mandates compliance with § R703.2 or ASTM E2570.
  • Forgetting flashing and proper termination above grade — EIFS must be flashed per § R703.4 and terminate ≥ 6 in. above finished grade. § R703.9.1(3), R703.9.1(5).
  • Face‑nailing decorative trim through the EIFS finish — explicitly prohibited. § R703.9.1(6), R703.9.2(9).

Worked example — concrete scenario

Project: A 2,400 ft² wood‑framed house with plywood sheathing will be finished with EIFS.

  1. Substrate: plywood sheathing on wood studs → drained EIFS required (not the plain EIFS limited to concrete/masonry). § R703.9.2(2).
  2. Product selection: choose an EIFS system and verify the manufacturer (or test data) shows compliance with ASTM E2568 and that the system, as assembled, meets ASTM E2273 with an average drainage efficiency ≥ 90%. § R703.9.2(1)–(3).
  3. WRB: specify a WRB that complies with § R703.2 or ASTM E2570 and ensure it will be applied between the wall sheathing and the EIFS. § R703.9.2(4–5).
  4. Flashing & grade: design continuous flashings at sills and penetrations per § R703.4 and make sure EIFS terminates at least 6 in. above finished ground. § R703.9.2(6), R703.9.2(8).
  5. Installation & trim: require installer follow the manufacturer instructions and prohibit face‑nailing of decorative trim through the EIFS. § R703.9.2(7), R703.9.2(9).

If the chosen EIFS system lacks either the ASTM E2568 compliance statement or the ASTM E2273 drainage test data showing ≥90% efficiency, it will not meet the CRC requirements for EIFS with drainage on framed walls.

Related provisions (quick list)

  • § R703.9.1 — EIFS (plain) requirements (concrete/masonry substrates).
  • § R703.9.2 — EIFS with drainage requirements (framed/sheathing substrates; 90% drainage efficiency; WRB rules).
  • § R703.4 — Flashing requirements referenced by the EIFS sections.
  • § R703.2 — Water‑resistive barrier requirements (WRB) — cited as the standard for WRB material and application for EIFS with drainage.
  • § R202 — Definitions including EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS) and EIFS with drainage.
  • Referenced standards: ASTM E2568, ASTM E2273, ASTM E2570 (see CRC referenced standards list).

If you want, I can: check a specific EIFS product’s supporting test reports against these CRC clauses (you’d upload the product docs), or produce a checklist you can use on plan submittal and inspections that maps each required item to the code citation.

Code references

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

  • CRC § 8.5 High relevance — show source text

    R703.8.5 Flashing. Flashing shall be located beneath the first course of masonry above finished ground level above the foundation wall or slab and at other points of support, including structural floors, shelf angles and lintels where masonry veneers are designed in accordance with Section R703.8. See Section R703.4 for additional requirements.

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    R703.8.6 Weepholes. Weepholes shall be provided in the outside wythe of masonry walls at a maximum spacing of 33 inches (838 mm) on center. Weepholes shall be not less than [3] / 16 inch (5 mm) in diameter. Weepholes shall be located immediately above the flashing.

    R703.9 Exterior insulation and finish system (EIFS)/EIFS with drainage. Exterior insulation and finish systems (EIFS) shall comply with this chapter and Section R703.9.1. EIFS with drainage shall comply with this chapter and Section R703.9.2.

    R703.9.1 Exterior insulation and finish systems (EIFS). EIFS shall comply with the following:

    1. ASTM E2568.

    2. EIFS shall be limited to applications over substrates of concrete or masonry wall assemblies.

    3. Flashing of EIFS shall be provided in accordance with the requirements of Section R703.4.

    4. EIFS shall be installed in accordance with the manufacturer’s instructions.

    5. EIFS shall terminate not less than 6 inches (152 mm) above the finished ground level.

    6. Decorative trim shall not be face-nailed through the EIFS.

    R703.9.2 Exterior insulation and finish system (EIFS) with drainage. EIFS with drainage shall comply with the following:

    1. ASTM E2568.

    2. EIFS with drainage shall be required over all wall assemblies with the exception of substrates of concrete or masonry wall assemblies.

    3. EIFS with drainage shall have an average minimum drainage efficiency of 90 percent when tested in accordance with ASTM E2273.

    4. The water-resistive barrier shall comply with Section R703.2 or ASTM E2570.

    5. The water-resistive barrier shall be applied between the EIFS and the wall sheathing.

    6. Flashing of EIFS with drainage shall be provided in accordance with the requirements of Section R703.4.

    7. EIFS with drainage shall be installed in accordance with the manufacturer’s instructions.

    8. EIFS with drainage shall terminate not less than 6 inches (152 mm) above the finished ground level.

    9. Decorative trim shall not be face-nailed through the EIFS with drainage.

    R703.10 Fiber cement siding.

    R703.10.1 Panel siding. Fiber-cement panels shall comply with the requirements of ASTM C1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Panels shall be installed with the long dimension either parallel or perpendicular to framing. Vertical and horizontal joints shall occur over framing members and shall be protected with caulking, or with battens or flashing, or be vertical or horizontal shiplap, or otherwise designed to comply with Section R703.1. Panel siding shall be installed with fasteners in accordance with Table R703.3(1) or the approved manufacturer’s instructions.

  • CRC § 9.2 High relevance — show source text

    R703.9.2 Exterior insulation and finish system (EIFS) with drainage. EIFS with drainage shall comply with the following:

    1. ASTM E2568.

    2. EIFS with drainage shall be required over all wall assemblies with the exception of substrates of concrete or masonry wall assemblies.

    3. EIFS with drainage shall have an average minimum drainage efficiency of 90 percent when tested in accordance with ASTM E2273.

    4. The water-resistive barrier shall comply with Section R703.2 or ASTM E2570.

    5. The water-resistive barrier shall be applied between the EIFS and the wall sheathing.

    6. Flashing of EIFS with drainage shall be provided in accordance with the requirements of Section R703.4.

    7. EIFS with drainage shall be installed in accordance with the manufacturer’s instructions.

    8. EIFS with drainage shall terminate not less than 6 inches (152 mm) above the finished ground level.

    9. Decorative trim shall not be face-nailed through the EIFS with drainage.

    R703.10 Fiber cement siding.

    R703.10.1 Panel siding. Fiber-cement panels shall comply with the requirements of ASTM C1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Panels shall be installed with the long dimension either parallel or perpendicular to framing. Vertical and horizontal joints shall occur over framing members and shall be protected with caulking, or with battens or flashing, or be vertical or horizontal shiplap, or otherwise designed to comply with Section R703.1. Panel siding shall be installed with fasteners in accordance with Table R703.3(1) or the approved manufacturer’s instructions.

    R703.10.2 Lap siding. Fiber-cement lap siding having a maximum width of 12 inches (305 mm) shall comply with the requirements of ASTM C1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Lap siding shall be lapped a minimum of 1 [1] / 4 inches (32 mm) and lap siding not having tongue-and-groove end joints shall have the ends protected with caulking, covered with an H-section joint cover, located over a strip of flashing, or shall be designed to comply with Section R703.1. Lap siding courses shall be installed with the fastener heads exposed or concealed, in accordance with Table R703.3(1) or approved manufacturer’s instructions.

    R703.11 Vinyl siding. Vinyl siding shall be certified and labeled as conforming to the requirements of ASTM D3679 by an approved

    agency.

    R703.11.1 Installation. Vinyl siding, insulated vinyl siding and compatible accessories shall be installed in accordance with the manufacturer’s installation instructions.

    R703.11.1.1 Starter strip. The first course of horizontal siding shall be secured using a starter strip as specified in the manufacturer’s installation instructions. See Figure R703.11.1.1(1). Where the first course of siding has to be cut or trimmed, the bottom edge shall be secured with utility trim and snap locks as specified by the manufacturer’s installation instructions.

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    ’FIGURE R703.11.1.1(1)—TYPICAL STARTER STRIP [a]

    a. This figure illustrates typical installation details. See the manufacturer’s installation instructions for actual installation details

  • CRC § 3.3. High relevance — show source text

    = On Center.
    a. Steel framing shall be minimum 33-ksi steel for 33-mil and 43-mil steel, and 50-ksi steel for 54-mil steel or thicker.
    b. Where cladding is attached to wood structural panel sheathing only, fastening requirements shall be in accordance with Table R703.3.3. For brick veneer tie connections to
    wood structural panels, refer to Table R703.8.4(2).
    c. Screws shall comply with the requirements of ASTM C1513.
    d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.|For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa.
    DR = Design Required.
    o.c. = On Center.
    a. Steel framing shall be minimum 33-ksi steel for 33-mil and 43-mil steel, and 50-ksi steel for 54-mil steel or thicker.
    b. Where cladding is attached to wood structural panel sheathing only, fastening requirements shall be in accordance with Table R703.3.3. For brick veneer tie connections to
    wood structural panels, refer to Table R703.8.4(2).
    c. Screws shall comply with the requirements of ASTM C1513.
    d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.|For SI: 1 inch = 25.4 mm, 1 mil = 0.0254 mm, 1 pound per square foot = 0.0479 kPa, 1 pound per square inch = 6.895 kPa.
    DR = Design Required.
    o.c. = On Center.
    a. Steel framing shall be minimum 33-ksi steel for 33-mil and 43-mil steel, and 50-ksi steel for 54-mil steel or thicker.
    b. Where cladding is attached to wood structural panel sheathing only, fastening requirements shall be in accordance with Table R703.3.3. For brick veneer tie connections to
    wood structural panels, refer to Table R703.8.4(2).
    c. Screws shall comply with the requirements of ASTM C1513.
    d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.|

    R703.16.2 Furred cladding attachment. Where steel or wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table R703.16.2. Where placed horizontally, wood furring shall be preservative-treated wood in accordance with Section R304.1 or naturally durable wood and fasteners shall be corrosion resistant in accordance with Section R304.3. Steel furring shall have a minimum G60 galvanized coating.

    |TABLE R703.16.2—FURRING MINIMUM FASTENING REQUIREMENTS FOR
    APPLICATION OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING

  • CRC § 8.4.1 High relevance — show source text

    Fasteners shall be sized such that the tip of the fastener passes completely through the wood structural panel sheathing by not less than1/4 inch.|

    R703.8.4.1 Size and spacing. Veneer ties, if strand wire, shall be not less in thickness than No. 9 U.S. gage [(0.148 inch) (4 mm)] wire and shall have a hook embedded in the mortar joint, or if sheet metal, shall be not less than No. 22 U.S. gage by [(0.0299 inch) (0.76 mm)] [7] / 8 inch (22 mm) corrugated. Each tie shall support not more than 2.67 square feet (0.25 m [2] ) of wall area and shall be spaced not more than 32 inches (813 mm) on center horizontally and 24 inches (635 mm) on center vertically.

    Exception: In Seismic Design Category D 0, D 1 or D 2 or townhouses in Seismic Design Category C or in wind areas of more than 30 pounds per square foot pressure (1.44 kPa), each tie shall support not more than 2 square feet (0.2 m [2] ) of wall area.

    R703.8.4.1.1 Veneer ties around wall openings. Additional metal ties shall be provided around wall openings greater than 16 inches (406 mm) in either dimension. Metal ties around the perimeter of openings shall be spaced not more than 3 feet (9144 mm) on center and placed within 12 inches (305 mm) of the wall opening.

    R703.8.4.2 Grout fill. As an alternative to the airspace required by Table R703.8.4(1), grout shall be permitted to fill the airspace. Where the airspace is filled with grout, a water-resistive barrier is required over studs or sheathing. Where the airspace is filled, replacing the sheathing and water-resistive barrier with a wire mesh and approved water-resistive barrier or an approved water-resistive barrier-backed reinforcement attached directly to the studs is permitted.

    R703.8.5 Flashing. Flashing shall be located beneath the first course of masonry above finished ground level above the foundation wall or slab and at other points of support, including structural floors, shelf angles and lintels where masonry veneers are designed in accordance with Section R703.8. See Section R703.4 for additional requirements.

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    R703.8.6 Weepholes. Weepholes shall be provided in the outside wythe of masonry walls at a maximum spacing of 33 inches (838 mm) on center. Weepholes shall be not less than [3] / 16 inch (5 mm) in diameter. Weepholes shall be located immediately above the flashing.

    R703.9 Exterior insulation and finish system (EIFS)/EIFS with drainage. Exterior insulation and finish systems (EIFS) shall comply with this chapter and Section R703.9.1. EIFS with drainage shall comply with this chapter and Section R703.9.2.

    R703.9.1 Exterior insulation and finish systems (EIFS). EIFS shall comply with the following:

    1. ASTM E2568.
  • CRC § 2.1. High relevance — show source text

    The exterior wall design shall be considered to resist wind-driven rain where the results of testing, in accordance with ASTM E331, indicate that water did not penetrate control joints in the exterior wall, joints at the perimeter of openings or intersections of terminations with dissimilar materials.

    2.1. Exterior wall test assemblies shall include not fewer than one opening, one control joint, one wall/eave interface and one wall sill. Tested openings and penetrations shall be representative of the intended end-use configuration. 2.2. Exterior wall test assemblies shall be not less than 4 feet by 8 feet (1219 mm by 2438 mm) in size. 2.3. Exterior wall test assemblies shall be tested at a minimum differential pressure of 6.24 pounds per square foot (0.297 kN/m [2] ). 2.4. Exterior wall test assemblies shall be subjected to a minimum test exposure duration of 2 hours. 3. Exterior insulation and finish systems (EIFS) complying with Section 1407.4.1.

    1402.2.1 [BSC-CG] See California Green Building Standards Code, Chapter 5, Division 5.4 for additional weather protection requirements.

    [BS] 1402.3 Wind resistance. Exterior walls, exterior wall coverings, exterior soffits and fascias, and the associated openings, shall be designed and constructed to resist safely the superimposed loads required by Chapter 16.

    [BS] 1402.3.1 Attachments through exterior insulation. Where exterior wall coverings are attached to the building structure through exterior continuous insulation, furring and attachments through the exterior insulation shall be designed to resist design loads determined in accordance with Chapter 16, including support of cladding weight as applicable. Exterior wall coverings attached to the building structure through foam plastic insulating sheathing shall comply with the attachment requirements of Section 1404.5.1, 1404.5.2 or 1404.5.3.

    1402.4 Fire resistance. Exterior walls shall be fire-resistance rated as required by other sections of this code with opening protection as required by Chapter 7.

    1402.5 Vertical and lateral flame propagation. Exterior walls on buildings of Type I, II, III and IV construction that contain a combustible exterior wall covering, combustible insulation or a combustible water-resistive barrier shall comply with Sections 1402.5.1 through 1402.5.5, as applicable. Where compliance with NFPA 285 and associated acceptance criteria is required in Sections 1402.5.1 through 1402.5.5, the exterior wall assembly shall be tested in accordance with and comply with the acceptance criteria of NFPA 285.

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    1402.5.1 Combustible water-resistive barrier. Exterior walls containing a combustible water-resistive barrier shall comply with Section 1402.6.

    1402.5.2 Metal composite material (MCM). Exterior walls containing metal composite material (MCM) systems shall comply with Section 1406.

    1402.5.3 Exterior insulation and finish system (EIFS). Exterior walls containing an exterior insulation and finish system (EIFS) shall comply with Section 1407.

  • CRC § 1406.10.3 High relevance — show source text
    1. The MCM is used as elements of balconies and similar projections, architectural trim or embellishments.

    1406.10.3 Full-scale tests. The MCM system shall be tested in accordance with, and comply with, the acceptance criteria of NFPA 285. Such testing shall be performed on the MCM system with the MCM in the maximum thickness intended for use.

    1406.11 Type V construction. MCM shall be permitted to be installed on buildings of Type V construction.

    1406.12 Foam plastic insulation. Where MCM systems are included in an exterior wall assembly containing foam plastic insulation, the exterior wall assembly shall also comply with the requirements of Section 2603.

    1406.13 Labeling. MCM shall be labeled in accordance with Section 1703.5.

    SECTION 1407—EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS)

    1407.1 General. The provisions of this section shall govern the materials, construction and quality of exterior insulation and finish systems (EIFS) for use as exterior wall coverings in addition to other applicable requirements of Chapters 7, 14, 16, 17 and 26.

    1407.2 Performance characteristics. EIFS shall be constructed such that it meets the performance characteristics required in ASTM E2568.

    [BS] 1407.3 Structural design. The underlying structural framing and substrate shall be designed and constructed to resist loads as required by Chapter 16.

    1407.4 Weather resistance. EIFS shall comply with Section 1402 and shall be designed and constructed to resist wind and rain in accordance with this section and the manufacturer’s application instructions.

    1407.4.1 EIFS with drainage. EIFS with drainage shall have an average minimum drainage efficiency of 90 percent when tested in accordance the requirements of ASTM E2273 and is required on framed walls of Type V construction, Group R1, R2, R3 and R4 occupancies.

    1407.4.1.1 Water-resistive barrier. For EIFS with drainage, the water-resistive barrier shall comply with Section 1403.2 or ASTM E2570.

    1407.5 Exterior walls of buildings of any height. Exterior wall assemblies containing an EIFS exterior wall covering shall comply with Section 2603.5.

    1407.6 Installation. Installation of the EIFS and EIFS with drainage shall be in accordance with the EIFS manufacturer’s instructions.

    1407.7 Special inspections. EIFS installations shall comply with the provisions of Sections 1704.2 and 1705.17.

    SECTION 1408—HIGH-PRESSURE DECORATIVE EXTERIOR-GRADE COMPACT LAMINATES (HPL)

    1408.1 General. The provisions of this section shall govern the materials, construction and quality of High-Pressure Decorative ExteriorGrade Compact Laminates (HPL) for use as exterior wall coverings in addition to other applicable requirements of Chapters 14 and 16.

    1408.2 Exterior wall covering. HPL used as exterior wall covering or as elements of balconies and similar projections and bay and oriel windows to provide cladding or weather resistance shall comply with Sections 1408.4 through 1408.14.

    1408.3 Architectural trim and embellishments. HPL used as architectural trim or embellishments shall comply with Sections 1408.7 through 1408.14.

  • CRC § 25.4 High relevance — show source text

    = on center.
    a. Cold-formed steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel and 50 ksi steel for 54 mil steel or thicker.
    b. Screws shall comply with the requirements of AISI S240.
    c. Foam sheathing shall have a minimum compressive strength of 15 pounds per square inch in accordance with ASTM C578 or ASTM C1289.|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. Cold-formed steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel and 50 ksi steel for 54 mil steel or thicker.
    b. Screws shall comply with the requirements of AISI S240.
    c. Foam sheathing shall have a minimum compressive strength of 15 pounds per square inch in accordance with ASTM C578 or ASTM C1289.|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. Cold-formed steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel and 50 ksi steel for 54 mil steel or thicker.
    b. Screws shall comply with the requirements of AISI S240.
    c. Foam sheathing shall have a minimum compressive strength of 15 pounds per square inch in accordance with ASTM C578 or ASTM C1289.|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. Cold-formed steel framing shall be minimum 33 ksi steel for 33 mil and 43 mil steel and 50 ksi steel for 54 mil steel or thicker.
    b. Screws shall comply with the requirements of AISI S240.
    c. Foam sheathing shall have a minimum compressive strength of 15 pounds per square inch in accordance with ASTM C578 or ASTM C1289.|

    [BS] 1404.5.2.2 Furred cladding attachment. Where steel or wood furring is used to attach cladding over foam sheathing, furring minimum fastening requirements to support the cladding weight shall be as specified in Table 1404.5.2.2. Where placed horizontally, wood furring shall be preservative-treated wood in accordance with Section 2303.1.9 or naturally durable wood and fasteners shall be corrosion resistant in accordance Section 2304.10.6. Steel furring shall have a minimum G60 galvanized coating.

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    |[BS] TABLE 1404.5.2.2—FURRING MINIMUM FASTENING REQUIREMENTS FOR
    APPLICATION OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING

  • CRC § 39966-39973. Medium relevance — show source text

    (e) Cellulose fiber spray applied.

    1. Composition. The basic material shall consist of virgin or recycled wood-based cellulosic fiber and may be made from related paper or paperboard stock, excluding contaminated materials and extraneous foreign materials such as metals and glass which may reasonably be expected to be retained in the finished product. Suitable chemicals may be introduced to improve flame resistance, processing, adhesive and cohesive qualities, and handling characteristics. The added chemicals shall not create a health hazard.

    The basic material shall be processed into a form suitable for installation by pneumatic conveying equipment and simultaneous mixing with water and/or adhesive at the spray nozzle. 2. Thermal performance. Determination of the thermal performance shall be in accordance with ANSI/ASTM C177-76, ANSI/ASTM C236-66 or ANSI/ASTM C518-76 at the manufacturer’s option. 3. Resistance to combustion. Flammability characteristics shall comply with the standard for flammability and smoldering combustion in 44 Fed. Reg. pages 39966-39973. 4. Corrosiveness. The product shall comply with the standard for corrosiveness set forth in 44 Fed. Reg. pages 39966-39973. 5. Bond strength. The bond strength shall be determined by Test Description Number 3 and the bond shall support a force five times the weight of the sample for 1 minute. 6. Bond deflection. The bond deflection shall be determined by Test Description Number 4 and shall be greater than [1] / 60 th of the length of the sample. 7. Air erosion. The air erosion shall be determined by Test Description Number 5 and shall withstand an air velocity of 800 ft/min. 8. Odor emission. Odor emissions shall be determined by Test Description Number 1. A detectable odor of objectionable nature observed by two or more panel members shall be cause for rejection. 9. Fungi resistance. Resistance to fungi shall be determined according to Method 508 of the March 10, 1975, edition of the Military Standard for Environmental Test Methods known as MIL-STD-810C, except the spore suspensions shall be prepared using distilled water, and observations shall be made at 7-day intervals during the 28-day cycle to determine the minimum length of time required for fungal growth to appear. Viability of the spore organisms shall be determined by injecting or inoculating a separate bottle of culture medium with the spore preparation for each organism and observing for growth and individual viability. The back side of [1] / 2 -inch (13 mm) standard commercial grade gypsum wall board grayback paper surface shall be used as the control. After the test exposure, the test samples shall be examined at 40 times magnification for evidence of fungal growth. The material shall show no more fungal growth than the control material. 10. Test procedures described in Items 5, 6 and 7 are not required of products which are installed in such a manner that physical restrictions imposed by the construction elements preclude any possibility of subsequent delamination, erosion or dusting and the product is identified only for such installations. (f) Mineral aggregate in board form.

    1. Composition. The basic material shall be mineral in nature, crushed, dried and graded to the proper particle size and expanded by the application of heat to form a spherical, cellular type of aggregate. It shall be composed of spherical cellular beads of expanded aggregate and fibers formed into rigid, flat, rectangular units and shall have an integral water proofing
  • CRC § 2-11 Medium relevance — show source text

    2025 CALIFORNIA RESIDENTIAL CODE 2-11

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

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    DEFINITIONS

    ENTRY LEVEL. For the purposes of Section R328, entry level is the floor or level of the dwelling unit on which an entry is located.

    [MP] EQUIPMENT. Piping, ducts, vents, control devices and other components of systems other than appliances that are permanently installed and integrated to provide control of environmental conditions for buildings. This definition shall also include other systems specifically regulated in this code.

    [MP] EQUIVALENT LENGTH. For determining friction losses in a piping system, the effect of a particular fitting equal to the friction loss through a straight piping length of the same nominal diameter.

    [RB] ESCARPMENT. With respect to topographic wind effects, a cliff or steep slope generally separating two levels or gently sloping areas.

    [MP] ESSENTIALLY NONTOXIC TRANSFER FLUIDS. Fluids having a Gosselin rating of 1, including propylene glycol; mineral oil; polydimethylsiloxane; hydrochlorofluorocarbon, chlorofluorocarbon and hydrofluorocarbon refrigerants; and FDA-approved boiler water additives for steam boilers.

    [MP] ESSENTIALLY TOXIC TRANSFER FLUIDS. Soil, water or graywater and fluids having a Gosselin rating of 2 or more including ethylene glycol, hydrocarbon oils, ammonia refrigerants and hydrazine.

    [MP] EVAPORATIVE COOLER. A device used for reducing air temperature by the process of evaporating water into an airstream.

    [MP] EXCESS AIR. Air that passes through the combustion chamber and the appliance flue in excess of what is theoretically required for complete combustion.

    [MP] EXHAUST HOOD, FULL OPENING. An exhaust hood with an opening not less than the diameter of the connecting vent.

    [RB] EXISTING BUILDING. Existing building is a building erected prior to the adoption of this code, or one for which a legal building permit has been issued.

    [MP] EXISTING INSTALLATIONS. Any plumbing system regulated by this code that was legally installed prior to the effective date of this code, or for which a permit to install has been issued.

    [RB] EXPANSIVE SOILS. Soils that exhibit volumetric increase or decrease (swelling or shrinking) in response to partial or full wetting or drying under load.

    [RB] EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS). EIFS are nonstructural, nonload-bearing exterior wall cladding systems that consist of an insulation board attached either adhesively or mechanically, or both, to the substrate; an integrally reinforced base coat; and a textured protective finish coat.

    [RB] EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS) WITH DRAINAGE. An EIFS that incorporates a means of drainage applied over a water-resistive barrier.

    [RB] EXTERIOR SOFFIT. A material or assembly of materials applied on the underside of exterior overhangs and attached carport and porch ceilings.

  • CRC § 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.

  • CRC § 6.2 Medium relevance — show source text

    R202, R302.11

    E283/E283M—19: Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Skylights, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen

    R202

    E330/E330M—14(2021): Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform Static Air Pressure Difference

    R609.4, R609.5, R609.6.2, R703.1.2

    E331—2000(2016): Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference

    R703.1.1

    E814—2013A(2017): Standard Test Method for Fire Tests of Penetration Firestop Systems

    R302.4.1.2

    E970—2017: Standard Test Method for Critical Radiant Flux of Exposed Attic Floor Insulation Using a Radiant Heat Energy Source

    R302.10.4

    E1592—2005(2017): Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference

    R905.10.5

    44-12 2025 CALIFORNIA RESIDENTIAL CODE

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

    REFERENCED STANDARDS

    E1602—2003(2017): Guide for Construction of Solid Fuel Burning Masonry Heaters

    R1002.2

    E1745—17: Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs

    R506.3.3

    E1886—19: Standard Test Method for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials R301.2.1.2, R609.6.1, R609.6.2, Table R703.11.2

    E1996—20: Specification for Performance of Exterior Windows, Curtain Walls, Doors, and Impact Protective Systems Impacted by Windborne Debris in Hurricanes

    R301.2.1.2, R609.6.1, R609.6.2

    E2178—21a: Standard Test Method for Determining Air Leakage Rate and Calculation of Air Permeance of Building Materials

    R202

    E2273—2018: Standard Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall Assemblies

    R703.9.2

    E2556/E2556M—2010(2016): Standard Specification for Vapor Permeable Flexible Sheet Water-resistive Barriers Intended for Mechanical Attachment

    R703.2

    E2568—2017A: Standard Specification for PB Exterior Insulation and Finish Systems

    R703.9.1, R703.9.2

    E2570/E2570M—07(2019): Standard Test Methods for Evaluating Water-Resistive Barrier (WRB) Coatings Used under Exterior Insulation and Finish Systems (EIFS) or EIFS with Drainage

    R703.9.2

    E2632/E2632M—2013e1: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials:

  • CRC § 0.447 Medium relevance — show source text
    b—continued Col2 Col3 Col4 Col5 Col6 Col7 Col8
    ** WALL SUPPORTING** ** ROOF SLOPE** ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)    		 ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)    		 ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)    		 ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)    		 ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)    		 ** ULTIMATE WIND SPEED AND EXPOSURE**
    (mph)
    ** WALL SUPPORTING** ** ROOF SLOPE** ** 115 B** ** 120 B** ** 130 B** ** < 140 B** ** < 130 C** ** < 140 C**
    ** WALL SUPPORTING** ** ROOF SLOPE** ** 115 B** ** 120 B** ** 115 C** ** 120 C** ** 120 C** ** 120 C**
    Two stories, roof and ceiling
    (first floor of a three-story building)    		 3:12 43 53 57 64 89 113
    Two stories, roof and ceiling
    (first floor of a three-story building)    		 6:12 41 51 51 67 95 114
    Two stories, roof and ceiling
    (first floor of a three-story building)    		 9:12 53 63 63 89 104 126
    Two stories, roof and ceiling
    (first floor of a three-story building)    		 12:12 54 67 74 100 142 157
    For SI: 1 mph = 0.447 m/s.
    a. Linear interpolation is permitted.
    b. For hip-roofed homes the minimum percentage of full-height sheathing, based on wind, is permitted to be multiplied by a factor of 0.95 for roof slopes not exceeding 7:12
    and a factor of 0.9 for roof slopes greater than 7:12.    		 For SI: 1 mph = 0.447 m/s.
    a. Linear interpolation is permitted.
    b. For hip-roofed homes the minimum percentage of full-height sheathing, based on wind, is permitted to be multiplied by a factor of 0.95 for roof slopes not exceeding 7:12
    and a factor of 0.9 for roof slopes greater than 7:12.    		 For SI: 1 mph = 0.447 m/s.
    a. Linear interpolation is permitted.
    b. For hip-roofed homes the minimum percentage of full-height sheathing, based on wind, is permitted to be multiplied by a factor of 0.95 for roof slopes not exceeding 7:12
    and a factor of 0.9 for roof slopes greater than 7:12.    		 For SI: 1 mph = 0.447 m/s.
    a. Linear interpolation is permitted.
    b. For hip-roofed homes the minimum percentage of full-height sheathing, based on wind, is permitted to be multiplied by a factor of 0.95 for roof slopes not exceeding 7:12
    and a factor of 0.9 for roof slopes greater than 7:12.    		 For SI: 1 mph = 0.447 m/s.
    a. Linear interpolation is permitted.
    b.

Frequently asked questions

Can I install plain EIFS over plywood or OSB sheathing?

No. The CRC requires EIFS with drainage over all wall assemblies except concrete or masonry substrates; plain EIFS is limited to concrete or masonry. § R703.9.1(2) and § R703.9.2(2).

What drainage performance does the code require for drained EIFS?

An average minimum drainage efficiency of 90 percent when tested per ASTM E2273. § R703.9.2(3).

Where must the WRB go for EIFS with drainage?

The WRB must comply with § R703.2 or ASTM E2570 and be applied between the EIFS and the wall sheathing (i.e., WRB underneath the EIFS). § R703.9.2(4–5).

How high above grade must EIFS terminate?

EIFS shall terminate not less than 6 inches (152 mm) above finished ground level. § R703.9.1(5) and § R703.9.2(8).

Is it acceptable to face‑nail decorative trim through EIFS?

No. Decorative trim shall not be face‑nailed through either EIFS or EIFS with drainage. § R703.9.1(6) and § R703.9.2(9).

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California Residential Code