CWUIC · California Wildland-Urban Interface Code
Which tube‑furnace combustibility tests are referenced for CWUIC materials?
Under CWUIC **§ 501.4.1**, the code points you to two ASTM tube‑furnace methods — **E136** (vertical tube) and **E2652** (tube furnace with cone airflow stabilizer) — both run at **750°C**; the CWUIC lists those standards and editions, but the detailed test procedures and pass/fail criteria are in the ASTM standards themselves, not reproduced in the code.
Last reviewed: July 6, 2026
What the code requires — plain English (controlling §)
The California Wildland‑Urban Interface Code requires combustibility of certain materials to be assessed using the tube‑furnace methods the code references. The controlling provision is § 501.4.1, which specifically references the ASTM tube‑furnace methods E136 and E2652 as the test procedures to be used for combustibility evaluation under that section.
The single most important rule: if the CWUIC directs a tube‑furnace combustibility evaluation under § 501.4.1, you must use the ASTM standard(s) the CWUIC lists — E136 and/or E2652 (both operate at 750°C) — in the edition the CWUIC references.
Requirements in detail
Which standards are referenced
- ASTM E136 — “Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750°C.” The CWUIC lists E136 as a referenced standard for § 501.4.1.
- ASTM E2652 — “Standard Test Method for Assessing Combustibility of Materials Using a Tube Furnace with a Cone‑shaped Airflow Stabilizer, at 750°C.” The CWUIC lists E2652 as a referenced standard for § 501.4.1.
Key decision‑relevant dimensions and values
| Decision factor | Value / description | Code reference |
|---|---|---|
| Furnace temperature specified in the referenced tests | 750°C | § 501.4.1 (via ASTM E136, E2652) |
| Orientation / furnace type — E136 | Vertical tube furnace method | § 501.4.1 (ASTM E136) |
| Orientation / furnace type — E2652 | Tube furnace with cone‑shaped airflow stabilizer | § 501.4.1 (ASTM E2652) |
| Edition / year called out in CWUIC | E136 (2024a) and E2652 (2022) as listed in the CWUIC referenced‑standards table | § 501.4.1 (referenced standards list) |
| Where to find pass/fail criteria | Within the ASTM standard test procedures themselves (NOT reproduced in CWUIC) | CWUIC references only the ASTM standards E136 and E2652 — see § 501.4.1 |
What the CWUIC text itself provides (and what it does not)
- The CWUIC identifies which ASTM test methods to use for tube‑furnace combustibility assessments under § 501.4.1 (E136 and E2652) and lists the standard editions.
- The CWUIC reference entry records the test titles and the 750°C test temperature in the standards’ titles as shown in the referenced‑standards list.
- The CWUIC does not embed the ASTM test procedure details (sample size, specimen conditioning, instrumentation, numerical pass/fail criteria). Those procedural and acceptance details are contained in the ASTM standards themselves; they are not reproduced in the CWUIC reference lists provided. If you need pass/fail thresholds or specimen dimensions, order the ASTM standard (E136 and/or E2652) cited by § 501.4.1.
Exceptions & special cases
- Edition matters: the CWUIC’s referenced‑standards list identifies specific editions (for example, E136 — 2024a and E2652 — 2022 as shown in the CWUIC references). Use the edition the code references unless the authority having jurisdiction allows a later edition. § 501.4.1 points you to those ASTM standards via the referenced standards table.
- The CWUIC text included in the provided files does not state when to choose E136 versus E2652 for a particular material form or geometry. The code simply references both methods under § 501.4.1; the ASTM documents and/or the approving authority must be consulted to determine which is appropriate for a given specimen type.
Common mistakes
- Assuming the CWUIC contains the ASTM test details. It does not — the CWUIC references the standards; the detailed procedures and acceptance criteria are in ASTM E136 and E2652 themselves. Check the ASTM standards for specimen size, conditioning, instrumentation and pass/fail rules.
- Using the wrong edition. The CWUIC’s referenced‑standards table lists editions; using an older or different edition without AHJ approval can cause rejection. § 501.4.1 ties the combustibility requirement to those listed ASTM standards.
- Treating E136 and E2652 as identical tests. They are distinct test methods (vertical tube vs. tube with cone airflow stabilizer) even though both are run at 750°C; select the method appropriate to the material and specimen per the ASTM scope and your AHJ/laboratory guidance.
Worked example — ordering and documenting a tube‑furnace combustibility test (concrete scenario)
- Situation: A product manufacturer needs a CWUIC‑referenced combustibility report for a new polymeric exterior trim product where § 501.4.1 requires a tube‑furnace method.
- Code check: CWUIC § 501.4.1 references ASTM E136 and E2652 (editions shown in the referenced‑standards table). Both standards’ titles include 750°C.
- Action steps the manufacturer takes (no procedural details invented here — steps are administrative and traceable to the CWUIC):
- Specify to the testing lab: “Perform combustibility evaluation in accordance with ASTM E2652 — 2022 (tube furnace with cone‑shaped airflow stabilizer, 750°C) — as referenced by CWUIC § 501.4.1.” Include the CWUIC citation in the test request and ask the lab to include the ASTM edition in the report.
- If the lab recommends E136 (vertical tube furnace) instead, request written justification (reference to ASTM scope and specimen suitability) and confirm acceptance with the authority having jurisdiction because CWUIC lists both standards under § 501.4.1.
- Keep the ASTM test report attached to product submittals so your AHJ can verify the test method and edition match the CWUIC reference (§ 501.4.1).
Related provisions (within the CWUIC referenced‑standards list)
- § 501.4.1 — the controlling section that references E136 and E2652 for combustibility assessments.
- § 202 — CWUIC definitions and referenced‑standards cross‑references appear alongside test-method listings (E84 and others are cross‑listed to § 202 in the CWUIC referenced table).
- § 503.2.4 — other material fire‑performance tests (e.g., surface burning) are referenced elsewhere in the CWUIC referenced‑standards list and may be relevant for different evaluations (ASTM E84 is cross‑listed).
- § 504.7.3.2 / § 504.7.3.3 — sections that reference deck/under‑deck test methods (ASTM E2632 and related standards) appear in the same referenced‑standards listing and may be relevant when evaluating deck assemblies.
(Each of these related section cross‑references appears in the CWUIC referenced‑standards table; see the CWUIC referenced‑standards entries for the specific ASTM test method listings.)
Code references
Grounded in the retrieved California Wildland-Urban Interface Code — click a citation to read the verbatim passage:
CWUIC § 1.8 High relevance — show source text
403.1.8, 1273.10
ASTM ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959
D638—2022: Standard Test Method for Tensile Properties of Plastics
504.9.1
D2898—10(2017): Standard Practice for Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing
503.2.4.3.1
D3909/D3909M— 2022 : Standard Specification for Asphalt Roll Roofing (Glass Felt) Surfaced With Mineral Granules
504.2.1.1, 504.2.2
D6662—22: Standard Specification for Polyolefin-Based Plastic Lumber Decking Boards
503.2.4.3.3
D7032—21: Standard Specification for Establishing Performance Ratings for Wood-Plastic Composite and Plastic Lumber Deck Boards, Stair Treads, Guards, and Handrails
503.2.4.3.2
E84— 2023d : Standard Test Method for Surface Burning Characteristics of Building Materials
202, 501.4.1, 503.2.4, 504.7.3.2, 504.7.3.3
E108—20a: Standard Test Methods for Fire Tests of Roof Coverings
504.2, 504.2.1.2, 504.11.6, G101.2.1
E119— 2022 : Standard Test Methods for Fire Tests of Building Construction and Materials
501.3, 504.3, 504.3.1, 504.5, 504.7, 504.7.1
E136— 2024a : Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
501.4.1
E1354— 2023 : Standard Test Method for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen Consumption Calorimeter
503.2.4.3.2, 503.2.4.3.3
E2632—2020: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials
504.7.3.2, 504.7.3.3, 504.7.3.3.1, 504.7.3.4
E2652—2022: Standard Test Method for Assessing Combustibility of Materials Using a Tube Furnace with a Cone-shaped Airflow Stabilizer, at 750°C
501.4.1
E2707—2022: Standard Test Method for Determining Fire Penetration of Exterior Wall Assemblies Using a Direct Flame Impingement Exposure
504.5, 504.9, 504.9.3
E2726/E2726M—2012a(2017): Standard Test Method for Evaluating the Fire Test Response of Deck Structures to Burning Brands
504.7.3.2, 504.7.3.3, 504.7.3.3.2
CWUIC § 501.3 High relevance — show source text
501.3, 504.3, 504.3.1, 504.5, 504.7, 504.7.1
E136— 2024a : Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
501.4.1
E1354— 2023 : Standard Test Method for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen Consumption Calorimeter
503.2.4.3.2, 503.2.4.3.3
E2632—2020: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials
504.7.3.2, 504.7.3.3, 504.7.3.3.1, 504.7.3.4
E2652—2022: Standard Test Method for Assessing Combustibility of Materials Using a Tube Furnace with a Cone-shaped Airflow Stabilizer, at 750°C
501.4.1
E2707—2022: Standard Test Method for Determining Fire Penetration of Exterior Wall Assemblies Using a Direct Flame Impingement Exposure
504.5, 504.9, 504.9.3
E2726/E2726M—2012a(2017): Standard Test Method for Evaluating the Fire Test Response of Deck Structures to Burning Brands
504.7.3.2, 504.7.3.3, 504.7.3.3.2
E2768—11(2018): Standard Test Method for Extended Duration Surface Burning Characteristics of Building Materials (30 min Tunnel Test)
503.2.4
2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE 7-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
REFERENCED STANDARDS
E2886/E2886M—20: Standard Test Method for Evaluating the Ability of Exterior Vents to Resist the Entry of Embers and Direct Flame Impingement
504.10.1
E2957—2017 : Standard Test Method for Resistance to Wildfire Penetration of Eaves, Soffits and Other Projections
504.3, 504.7, 504.7.1, 504.7.2
G155—2021: Standard Practice for Operating Xenon Arc Lamp Apparatus for Exposure of Materials
504.9.2
ICC International Code Council, Inc., 200 Massachusetts Avenue, NW, Suite 250, Washington, DC 20001
CBC—2025: California Building Code
CWUIC § 13.2 High relevance — show source text
R905.13.2
D7672—19: Standard Specification for Evaluating Structural Capacities of Rim Board Products and Assemblies
R502.1.7, R602.1.7, R802.1.6
D7793—20: Standard Specification for Insulated Vinyl Siding Table R703.3(1), R703.13
D8257/D8257M—20: Standard Specification for Mechanically Attached Polymeric Roof Underlayment Used in Steep Slope Roofing R905.1.1, Table R905.1.1(1)
E84—21a: Standard Test Method for Surface Burning Characteristics of Building Materials
R202, R302.9.3, R302.9.4, R302.10.1, R302.10.2, R302.15, R507.2.2.2, R703.14.3
E96/E96M—21: Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials R202, Table R806.5
E108— 2020a : Standard Test Methods for Fire Tests of Roof Coverings
R302.2.4, R902.
E119—20: Standard Test Methods for Fire Tests of Building Construction and Materials Table R302.1(1), Table R302.1(2), R302.2.1, R302.2.2, R302.3, R302.4.1, R302.11.1, R606.2.2
E136— 2022: Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
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
CWUIC § 1206.2 High relevance — show source text
1206.2, 1206.2.1
E96/E96M—21: Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
202, 1202.3, 1404.3
E108—20a: Standard Test Methods for Fire Tests of Roof Coverings
1505.1, 2603.6, 2610.2, 2610.3
E119—20: Standard Test Methods for Fire Tests of Building Construction and Materials
705.8.5, 703.2.1.1, 703.2.1.3, 703.2.1.4, 703.2.1.5, 703.2.2, 703.4, 703.6, 704.11, 705.8, 707.6, 712.1.13.2, 714.4.1, 714.5.1, 715.3, 715.4, 715.4.1, Table 716.1(1), Table 716.1(2), Table 716.1(3), 716.1.2.3, 716.2.5.1.1, 716.2.5.4, 716.3.2.1.1, 717.3.1, 717.5.2, 717.5.3, 717.6.1, 717.6.2, Table 721.1(1), 2103.1, 2603.5.1
E136—2022: Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
703.3.1
E283/E283M—19: Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen
202
E330/E330M—14(2021): Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform Static Air Pressure Difference
1709.5.2, 1709.5.2.1, 1709.5.3.1
E331—2000(2016): Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors and Curtain Walls by Uniform Static Air Pressure Difference
1402.2, 1403.2
E336—20: Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings
1206.2
E492—2009(2016)E1: Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine
1206.3
E580/E580M—22: Standard Practice for Installation of Ceiling Suspension Systems for Acoustical Tile and Lay-in Panels in Areas Subject to Earthquake Ground Motions
1617.12.13, 1617A.1.21
E605/E605M—19: Test Method for Thickness and Density of Sprayed Fire-Resistive Material (SFRM) Applied to Structural Members
1705.15.4.1, 1705.15.4.2, 1705.15.4.5, 1705.15.5
E648—2017A: Standard Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radiant Heat Energy Source
CWUIC § 1901.2.1 High relevance — show source text
1901.2.1
D8223—19: Standard Practice for Evaluation of Fire-Retardant Treated Laminated Veneer Lumber
2303.2.6.3
D8257/D8257M—20: Standard Specification for Mechanically Attached Polymeric Roof Underlayment Used in Steep Slope Roofing 1507.1.1, Table 1507.1.1(1)
E84—21a: Standard Test Methods for Surface Burning Characteristics of Building Materials
202, 402.6.4.4, 406.7.2, 424.2, 602.4.1.1, 602.4.2.1, 602.4.3.1, 720.1, 720.4, 803.1.2, 803.5.2, 803.10, 803.11, 803.12, 803.13, 806.6, 1402.6, 1403.11.1, 1406.9, 1406.10.1, 1408.9, 1408.10.1, 1511.6.2, 1511.6.3, 2303.2, 2603.3, 2603.4.1.13, 2603.5.4, 2603.5.5, 2603.7, 2604.2.4, 2606.4, 2612.3, 2614.3, 3105.3
E90—2009(2016): Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
1206.2, 1206.2.1
E96/E96M—21: Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
202, 1202.3, 1404.3
E108—20a: Standard Test Methods for Fire Tests of Roof Coverings
1505.1, 2603.6, 2610.2, 2610.3
E119—20: Standard Test Methods for Fire Tests of Building Construction and Materials
705.8.5, 703.2.1.1, 703.2.1.3, 703.2.1.4, 703.2.1.5, 703.2.2, 703.4, 703.6, 704.11, 705.8, 707.6, 712.1.13.2, 714.4.1, 714.5.1, 715.3, 715.4, 715.4.1, Table 716.1(1), Table 716.1(2), Table 716.1(3), 716.1.2.3, 716.2.5.1.1, 716.2.5.4, 716.3.2.1.1, 717.3.1, 717.5.2, 717.5.3, 717.6.1, 717.6.2, Table 721.1(1), 2103.1, 2603.5.1
E136—2022: Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
703.3.1
CWUIC § 1.1 High relevance — show source text
Table R905.12
D6757/D6757M—2018: Specification for Underlayment Felt Containing Inorganic Fibers Used in Steep-Slope Roofing R905.1.1, Table R905.1.1(1)
D6841—21: Standard Practice for Calculating Design Value Treatment Adjustment Factors for Fire-Retardant-Treated Lumber
R302.15.7
D6878/D6878M—2021: Standard Specification for Thermoplastic Polyolefin-Based Sheet Roofing
Table R905.12
D6947/D6947M—2016: Standard Specification for Liquid Applied Moisture Cured Polyurethane Coating Used in Spray Polyurethane Foam Roofing System Table R905.13.3, R905.14.2, Table R909.2
D7032—2021: Standard Specification for Establishing Performance Ratings for Wood-Plastic Composite and Plastic Lumber Deck Boards, Stair Treads, Guards, and Handrails
R507.2.2, R507.2.2.1, R507.2.2.3, R507.2.2.4
D7158—D7158M—20: Standard Test Method for Wind Resistance of Asphalt Shingles (Uplift Force/Uplift Resistance Method) R905.2.4.1, Table R905.2.4.1
D7254—21: Standard Specification for Polypropylene (PP) Siding Table R703.3(1), R703.14
D7425/D7425M—13(2019): Standard Specification for Spray Polyurethane Foam Used for Roofing Applications
R905.13.2
D7672—19: Standard Specification for Evaluating Structural Capacities of Rim Board Products and Assemblies
R502.1.7, R602.1.7, R802.1.6
D7793—20: Standard Specification for Insulated Vinyl Siding Table R703.3(1), R703.13
D8257/D8257M—20: Standard Specification for Mechanically Attached Polymeric Roof Underlayment Used in Steep Slope Roofing R905.1.1, Table R905.1.1(1)
E84—21a: Standard Test Method for Surface Burning Characteristics of Building Materials
R202, R302.9.3, R302.9.4, R302.10.1, R302.10.2, R302.15, R507.2.2.2, R703.14.3
E96/E96M—21: Standard Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials R202, Table R806.5
E108— 2020a : Standard Test Methods for Fire Tests of Roof Coverings
R302.2.4, R902.
E119—20: Standard Test Methods for Fire Tests of Building Construction and Materials Table R302.1(1), Table R302.1(2), R302.2.1, R302.2.2, R302.3, R302.4.1, R302.11.1, R606.2.2
E136— 2022: Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
R202, R302.11
CWUIC § 1407.2 High relevance — show source text
1407.2
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
1407.4.1.1, 1705.17.1
E2573—19: Standard Practice for Specimen Preparation and Mounting of Site-fabricated Stretch Systems to Assess Surface Burning Characteristics
803.10
E2579—21: Standard Practice for Specimen Preparation and Mounting of Wood Products to Assess Surface Burning Characteristics
803.11
E2599—2018: Standard Practice for Specimen Preparation and Mounting of Reflective Insulation, Radiant Barrier and Vinyl Stretch Ceiling Materials for Building Applications to Assess Surface Burning Characteristics
2614.3
E2632/E2632M—13: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials
709A.3, 709A.4, 709A.4.1, 709A.5
E2634—2018: Standard Specification for Flat Wall Insulating Concrete Form (ICF) Systems
1903.3
E2652—18: Standard Test Method for Assessing Combustibility of Materials Using a Tube Furnace with a Cone-shaped Airflow Stabilizer, at 750 [o] C
703.3.1
E2707—15: Standard Test Method for Determining Fire Penetration of Exterior Wall Assemblies Using a Direct Flame Impingement Exposure
707A.3, 707A.3.1, 708A.3
E2726/E2726—12a: Standard Test Method for Evaluating the Fire-Test-Response of Deck Structures to Burning Brands
709A.3, 709A.4, 709A.4.2
E2751/E2751M—2017A: Practice for Design and Performance of Supported Laminated Glass Walkways
2409.1
E2768—11(2018): Standard Test Method for Extended Duration Surface Burning Characteristics of Building Materials (30 min Tunnel Test)
2303.2.1
E2837—2013(2017): Standard Test Method for Determining the Fire Resistance of Continuity Head-of-Wall Joint Systems Installed Between Rated Wall Assemblies and Nonrated Horizontal Assemblies
715.6
E2925—19a: Standard Specification for Manufactured Polymeric Drainage and Ventilation Materials Used to Provide a Rainscreen Function
2510.6.2
E3121—17: Standard Test Methods for Field Testing of Anchors in Concrete or Masonry
1901.3.4.3, 1910A.5.2, 1909.2.6.2, 1909.2.6.5, 1910A.5.5
F547—2017: Terminology of Nails for Use with Wood and Wood-Base Materials
Table 2506.2
F606/F606M—21: Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
2213.1, 2213A.1
CWUIC § 62.1 High relevance — show source text
ASHRAE ASHRAE, 180 Technology Parkway, Peachtree Corners, GA 30092
62.1—2022: Ventilation for Acceptable Indoor Air Quality
807.2
2025 CALIFORNIA EXISTING BUILDING CODE 16-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
REFERENCED STANDARDS
ASME American Society of Mechanical Engineers, Two Park Avenue, New York, NY 10016
A17.1—2022/CSA B44—2022: Safety Code for Elevators and Escalators
306.7.7, 306.7.8, 902.1.2
A17.3—2023: Safety Code for Existing Elevators and Escalators
902.1.2
A18.1—2023: Safety Standard for Platform Lifts and Stairway Chair Lifts
306.7.9
ASTM ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959
A615 — 22: Specification for Deformed and Plain Carbon-steel Bars for Concrete Reinforcement
303A.3.5.3
C94/C94M—21b: Standard Specification for Ready-Mixed Concrete
109.3.1
E108—20a: Standard Test Methods for Fire Tests of Roof Coverings
1204.5
E136—22: Standard Test Method for Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750 Degrees C
202
F2006—21: Standard Safety Specification for Window Fall Prevention Devices for Non-Emergency Escape (Egress) and Rescue (Ingress) Windows
505.2, 702.4
F2090—21: Specification for Window Fall Prevention Devices with Emergency (Egress) Release Mechanisms
505.2, 505.3.1, 702.4, 702.5.1
ICC International Code Council, Inc., 200 Massachusetts Avenue, NW, Suite 250, Washington, DC 20001
CBC—25: California Building Code
101.4.1, 104.3.1, 106.2.2, 109.3.3, 109.3.6, 109.3.9, 109.3.10, 110.2, 201A.3, 202, 202A, 301A.1, 301A.5, 301.3, 302A.4, 302.4.1, 302.5, 303.1, 303A.1, 303.3, 304.1, 304A.1, 304.3.1, 304.3.2, 305.1, 306.5, 306.6.1, 306.6.1.1, 306.7, 306.7.2, 306.7.4, 306.7.5, 306.7.7, 306.7.10, 306.7.11, 306.7.11.1, 306.7.11.2, 306.7.11.3, 306.7.12, 306.7.13, 306.7.15, 306.7.17, 306.7.18, 306.7.18.3,
CWUIC § 4-2012 High relevance — show source text
Plastic| |ASTM E96/E96M-2016|Standard Test Method for Water Vapor Transmission of Materials|Miscellaneous| |ASTM E136-2019a|Standard Test Method for Assessing Combustibility of Materials Using a Ver-
tical Tube Furnace at 750°C|Furnace| |AWS|AWS|AWS| |AWS B2.4-2012|Welding Procedure and Performance Qualification for Thermoplastics|Joints, Certification| |CFR|CFR|CFR| |10 CFR 430|Energy Conservation Program for Consumer Products|Energy Conservation| |10 CFR 431|Energy Efficiency Program for Certain Commercial and Industrial Equipment|Energy Efficiency| |10 CFR 431.62|Definitions Concerning Commercial Refrigerators, Freezers and Refrigerator-
Freezers|Commercial Refrigerators,
Freezers and Refrigerator-
Freezers| |10 CFR 431.86|Uniform Test Method for the Measurement of Energy Efficiency of Commer-
cial Packaged Boilers|Boilers|380 2025 CALIFORNIA MECHANICAL CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
REFERENCED STANDARDS
TABLE 1801.2 (continued) « STANDARDS, PUBLICATIONS, PRACTICES, AND GUIDES
DOCUMENT NUMBER DOCUMENT TITLE APPLICATION 10 CFR 431.302 Definitions Concerning Walk-In Coolers and Walk-In Freezers Walk-in Coolers and
Freezers29 CFR 1910.134 Respiratory Protection Respiratory Protection 49 CFR 192 Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety
StandardsGas Piping 49 CFR 192.123 Design Limitations for Plastic Pipe Piping, Plastic CGSB CGSB CGSB CAN/CGSB 149.10-2019 Determination of the Airtightness of Building Envelopes by the Fan Depres-
surization MethodVentilation CSA CSA CSA ANSI Z21.12b-1994 (R2020) Draft Hoods Fuel Gas, Appliances ANSI Z21.17a-2008/(R2019)
/CSA 2.7a-2008 (R2019)Domestic Gas Conversion Burners Conversion Burner Instal-
lation, Gas BurnersANSI Z21.20-2014
(R2019)/CAN/CSA-C22.2
No. 60730-2-5-2014
(R2019)Automatic Electrical Controls for Household and Similar Use – Part 2-5:
Particular Requirements for Automatic Electrical Burner Control SystemsAutomatic Ignition, Gas
Ignition, IgnitionCSA/ANSI Z21.21-
2019/CSA 6.5-2019Automatic Valves for Gas Appliances Appliance Valves, Auto-
matic Gas Valves, ValvesCSA Z21.40.1a-
1997/CGA 2.91a-M97
(R2017)Gas-Fired, Heat Activated Air-Conditioning and Heat Pump Appliances Gas Fired Air Condi-
tioning,CWUIC § 1407.4.1 High relevance — show source text
E2273—2018: Standard Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall Assemblies
1407.4.1, 2510.6.2
E2307—20: Standard Test Method for Determining Fire Resistance of Perimeter Fire Barriers Using the Intermediate-Scale, Multistory Test Apparatus
715.4
E2353—21: Standard Test Methods for Performance of Glazing in Permanent Railing Systems, Guards and Balustrades
2407.1.2
E2392 / E2392M—10(2016): Standard Guide for Design of Earthen Wall Building Systems
2109.2.4.8.9.2
E2393—20a: Standard Practice for On-Site Inspection of Installed Fire Resistive Joint Systems and Perimeter Fire Barriers
1705.18.2
E2404—17: Standard Practice for Specimen Preparation and Mounting of Textile, Paper or Polymeric (Including Vinyl) and Wood Wall or Ceiling Coverings, Facing and Veneers to Assess Surface Burning Characteristics
803.5.2, 803.12, 1402.6
E2556/E2556M—2010(2016): Standard Specification for Vapor Permeable Flexible Sheet Water-resistive Barriers Intended for Mechanical Attachment
1403.2, 2510.6.1
2025 CALIFORNIA BUILDING CODE 35-21
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
REFERENCED STANDARDS
E2568—2017A: Standard Specification for PB Exterior Insulation and Finish Systems
1407.2
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
1407.4.1.1, 1705.17.1
E2573—19: Standard Practice for Specimen Preparation and Mounting of Site-fabricated Stretch Systems to Assess Surface Burning Characteristics
803.10
E2579—21: Standard Practice for Specimen Preparation and Mounting of Wood Products to Assess Surface Burning Characteristics
803.11
E2599—2018: Standard Practice for Specimen Preparation and Mounting of Reflective Insulation, Radiant Barrier and Vinyl Stretch Ceiling Materials for Building Applications to Assess Surface Burning Characteristics
2614.3
E2632/E2632M—13: Standard Test Method for Evaluating the Under-Deck Fire Test Response of Deck Materials
709A.3, 709A.4, 709A.4.1, 709A.5
E2634—2018: Standard Specification for Flat Wall Insulating Concrete Form (ICF) Systems
1903.3
E2652—18: Standard Test Method for Assessing Combustibility of Materials Using a Tube Furnace with a Cone-shaped Airflow Stabilizer, at 750 [o] C
703.3.1
E2707—15: Standard Test Method for Determining Fire Penetration of Exterior Wall Assemblies Using a Direct Flame Impingement Exposure
707A.3, 707A.3.1, 708A.3
CWUIC § 12-7 High relevance — show source text
Individual thermocouple readings shall not exceed or fall below the standard time-temperature curve by more than 15 percent. (d) Furnace correction. When the indicated resistance period is [1] / 2 hour or over, determined by the average or maximum temperature rise on the unexposed surface or within the test sample, or by failure under load, a correction shall be applied for variation of the furnace exposure from that prescribed, where it will affect the classification, by multiplying the indicated period by twothirds of the difference in area between the curve of average furnace temperature and the standard curve for the first three-fourths of the period and dividing the product by the area between the standard curve and a base line of 60°F (20°C) for the same part of the indicated period, the latter area increased by 54 Fahr-hour or 30 Cent-hour (3240 Fahr-minutes or 1800 Cent-minutes) to compensate for the thermal lag of the furnace thermocouples during the first part of the test. For fire exposure in the test higher than standard, the indicated resistance period shall be increased by the amount of the correction and be similarly decreased for fire exposure below standard.
Note: The correction can be expressed by the following formula:
C = --------------------------21 A ( – AS ) 3 AS ( + L )
where:
C = correction in the same units as 1
1 = indicated fire endurance period
A = area under the curve of indicated average furnace temperature for the first three-fourths of the indicated period
AS = area under the standard furnace curve for the same part of the indicated period
L = lag correction in the same units as A and AS (54 Fahr-hour or 30 Cent-hour (3240 Fahr-minutes or 1800 Cent-minutes)
(e) Furnace pressure. The pressure in the furnace chamber during the fire test shall be maintained as nearly equal to atmospheric pressure as possible. Horizontal furnaces may be operated at a slight negative pressure sufficient to reduce haze permitting visual observation. Furnace stacks shall be equipped with dampers to facilitate maintenance of furnace pressure.
CORRELATION
Sec. 12-7-305. Tests of specific assemblies of materials shall be conducted for correlation (or correlation factor) of furnace exposure by comparison with tests of identical assemblies and materials conducted in furnaces of “Approved Listing Agencies” which furnaces are deemed as conforming to the design and operating requirements of this standard.
Correlation tests of wall furnaces shall include tests of two assemblies, one combustible and one noncombustible.
Correlation tests of horizontal furnaces dependent on intended test specimens shall include at least one test for each type of assembly such as combustible ceiling-floor assembly, noncombustible assembly having a high thermal capacity floor for heat dissipation, noncombustible assembly having an insulating concrete floor or other type of design.
Comparison of test results shall provide evidence of equivalent exposure based on transmitted temperatures on the unexposed side, on structural framing members, on the underside of floor or roof decks, and in the plenum space.
28 2025 CALIFORNIA REFERENCED STANDARDS CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
FIRE-RESISTIVE STANDARDS
2025 CALIFORNIA REFERENCED STANDARDS CODE 29
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
30 2025 CALIFORNIA REFERENCED STANDARDS CODE
CWUIC § 4-2012 Medium relevance — show source text
Designer|Professional Qualifications| |ASTM|ASTM|ASTM| |ASTM A568/A568M-2019a|Standard Specification for Steel, Sheet, Carbon, Structural, and High-Strength,
Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for|Piping| |ASTM A653/A653M-2020|Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron
Alloy-Coated (Galvannealed) by the Hot-Dip Process|Piping, Ferrous| |ASTM A733-2016|Standard Specification for Welded and Seamless Carbon Steel and Austenitic
Stainless Steel Pipe Nipples|Piping, Ferrous| |ASTM B370-2012 (R2019)|Standard Specification for Copper Sheet and Strip for Building Construction|Miscellaneous| |ASTM B687-1999 (R2016)|Standard Specification for Brass, Copper, and Chromium-Plated Pipe Nipples|Piping, Copper Alloy| |ASTM C518-2021|Standard Test Method for Steady-State Thermal Transmission Properties by
Means of the Heat Flow Meter Apparatus|Certification: Calibration,
Error Analysis, Heat Flow
Meter Apparatus, Heat
Flux, Instrument Verifica-
tion, Thermal Conductiv-
ity, Thermal Resistance,
Thermal Testing, Tunnel
Test| |ASTM D93-2020|Standard Test Method for Flash Point by Pensky-Martens Closed Cup Tester|Certification| |ASTM D396-2021|Standard Specification for Fuel Oils|Boiler| |ASTM D2517-2018|Standard Specification for Reinforced Epoxy Resin Gas Pressure Pipe and Fit-
tings|Piping, Plastic| |ASTM E96/E96M-2016|Standard Test Method for Water Vapor Transmission of Materials|Miscellaneous| |ASTM E136-2019a|Standard Test Method for Assessing Combustibility of Materials Using a Ver-
tical Tube Furnace at 750°C|Furnace| |AWS|AWS|AWS| |AWS B2.4-2012|Welding Procedure and Performance Qualification for Thermoplastics|Joints, Certification| |CFR|CFR|CFR| |10 CFR 430|Energy Conservation Program for Consumer Products|Energy Conservation| |10 CFR 431|Energy Efficiency Program for Certain Commercial and Industrial Equipment|Energy Efficiency| |10 CFR 431.62|Definitions Concerning Commercial Refrigerators, Freezers and Refrigerator-
Freezers|Commercial Refrigerators,
Freezers and Refrigerator-
Freezers| |10 CFR 431.86|Uniform Test Method for the Measurement of Energy Efficiency of Commer-
cial Packaged Boilers|Boilers|380 2025 CALIFORNIA MECHANICAL CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
REFERENCED STANDARDS
TABLE 1801.2 (continued) « STANDARDS, PUBLICATIONS, PRACTICES, AND GUIDES
DOCUMENT NUMBER DOCUMENT TITLE APPLICATION 10 CFR 431.302 Definitions Concerning Walk-In Coolers and Walk-In Freezers Walk-in Coolers and
Freezers29 CFR 1910.
Frequently asked questions
Which ASTM test does CWUIC § 501.4.1 require for tube‑furnace combustibility?
CWUIC § 501.4.1 references ASTM E136 and ASTM E2652 as the tube‑furnace methods to be used; both test titles specify a 750°C furnace.
Where are the pass/fail criteria and specimen sizes found?
They are contained in the ASTM standards themselves (E136 and E2652). The CWUIC referenced‑standards list does not reproduce procedural details or acceptance criteria.
Does CWUIC say when to use E136 versus E2652?
No — the CWUIC referenced‑standards table lists both standards under § 501.4.1 but does not provide decision rules for choosing one method over the other. Consult the ASTM standard scopes and your testing laboratory or AHJ for the correct method for your specimen.
Do I have to use the exact edition listed in the CWUIC?
Use the edition cited in the CWUIC referenced‑standards list (e.g., E136 — 2024a, E2652 — 2022) unless the authority having jurisdiction permits a later edition.
If a lab reports a combustibility test to a different ASTM method, will that satisfy CWUIC?
Not automatically. The lab test method and edition must align with the method(s) the CWUIC references in § 501.4.1, or you must obtain AHJ approval for an alternate test and edition.
More in California Wildland-Urban Interface Code
- Administration and Definitions
- Board of Appeals, Administration & Enforcement (permits, code official duties, appeals process)
- Wildland‑Urban Interface Area Designation & Mapping
- Fire Service Access & Water Supply (fire apparatus roads, driveways, hydrants, draft sites, standby power)
- Wildland‑Urban Interface Area Requirements (access, water, premises identification, key boxes)
- Referenced Standards & Test Methods
- Special Building Construction Regulations (ignition‑resistant construction, roof/vent/assembly requirements)
- Appendices and Model Ordinances (vegetation plans, severity‑zone adoption, home‑hardening guidance)
- Fire Protection Requirements (fire protection plans, systems, safety element provisions)
- Referenced California Documents & Matrix (CCR/Title 14 & 19 cross‑references, statutory references)
- Vegetation Management & Defensible Space (vegetation plans, maintenance, fire‑smart characteristics)
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