CWUIC · California Wildland-Urban Interface Code
Where are door positive‑pressure fire tests and related standards referenced?
Under the CWUIC, door positive‑pressure assembly tests are controlled by **§ 504.9**, which points to **UL 10C**, and plastic part flammability by **§ 504.9.2**, which points to **UL 94** — consult those named standards for the full test procedures and submit the test reports or listings required by the CWUIC.
Last reviewed: July 6, 2026
What the code requires — 2–4 sentences
The California Wildland‑Urban Interface Code (CWUIC) references positive‑pressure door assembly test methods and related material tests by listing the external standards to be used. In particular, § 504.9 points to the positive‑pressure door test standard UL 10C (Positive Pressure Fire Tests of Door Assemblies) and § 504.9.2 points to plastic‑part flammability tests such as UL 94 — the CWUIC referenced‑standards table shows these mappings. See § 504.9 and § 504.9.2 in the CWUIC referenced‑standards chapter for the official links to the standards .
The single most important point: if the CWUIC requires a fire test for a door or a plastic part, follow the standard the code lists (for doors, UL 10C under § 504.9; for plastic parts, UL 94 under § 504.9.2) as the controlling test method.
Requirements in detail
What the two controlling sections reference (plain list)
- § 504.9 — references UL 10C — Positive Pressure Fire Tests of Door Assemblies as the positive‑pressure test standard the code uses for door assemblies .
- § 504.9.2 — references UL 94 — Tests for Flammability of Plastic Materials for Parts in Devices and Appliances for flammability evaluation of plastic parts used in assemblies; the CWUIC also shows related exposure practices such as ASTM G155 referenced to 504.9.2 for accelerated weathering/exposure procedures where applicable .
Decision‑relevant table
| Decision factor | Requirement / value | Code Reference |
|---|---|---|
| Door positive‑pressure test standard | UL 10C — Positive Pressure Fire Tests of Door Assemblies | § 504.9 |
| Plastic‑part flammability test standard | UL 94 — Tests for Flammability of Plastic Materials (parts) | § 504.9.2 |
| Fire penetration / direct flame test of exterior assemblies (related) | ASTM E2707 referenced for some exterior fire‑penetration tests (also mapped to § 504.9 in referenced‑standards) | § 504.9 (related) |
| Exposure / weathering practice for plastic parts | ASTM/ICC practice G155 (xenon‑arc) referenced to § 504.9.2 | § 504.9.2 |
Notes:
- The CWUIC does not embed the full test procedures; it lists the named standards that are part of the code by reference. Use the full text of the named standard (e.g., UL 10C, UL 94, ASTM G155, ASTM E2707) to perform, evaluate, or certify tests as required by the CWUIC referenced section(s) .
How to read the mapping in the CWUIC
- The referenced‑standards chapter (Chapter 7 / Referenced Standards) lists each standard and the CWUIC section number(s) that rely on it. Look up UL 10C in that list to confirm it is the standard tied to § 504.9 and look up UL 94 for § 504.9.2 .
- If a test method has multiple acceptable standards in other codes (for example, building code sections may allow NFPA 252 or UL 10C), the CWUIC’s own referenced‑standards list is the controlling pointer for the CWUIC sections — follow the standard identified next to the CWUIC section number .
Exceptions & special cases
- The CWUIC text available in the referenced‑standards chapter shows the mapping (section → standard) but does not reproduce the full exceptions or alternate‑method allowances that appear inside the referenced standards themselves. For alternate test methods or equivalency (for example, NFPA vs UL alternatives), consult the specific CWUIC section and the listed standard. The CWUIC file preview does not include full alternate‑method language for § 504.9 beyond the referenced‑standards listing — consult the full CWUIC section text and the standard document for allowance details .
- Some related CWUIC sections (e.g., exterior wall/penetration tests) point to ASTM E2707 in conjunction with § 504.9; where multiple standards are referenced by a CWUIC section, review each named standard for its scope and applicable specimen configuration .
Common mistakes
- Relying on a similarly named test from another code (e.g., assuming NFPA 252 is acceptable under CWUIC) without checking the CWUIC referenced‑standards list — CWUIC explicitly maps its sections to the standards (UL 10C for § 504.9) and that list is the controlling reference in the CWUIC .
- Treating the referenced‑standards chapter as explanatory text rather than the legal linkage — the standards listed there become part of the code to the extent they are referenced; you must use the full referenced standard to perform or evaluate tests .
- Assuming UL 94 covers the entire door assembly flammability requirement — UL 94 is the test procedure for plastics and is called out by § 504.9.2 specifically for plastic parts; the door assembly test requirement itself is the positive‑pressure assembly test (UL 10C) under § 504.9 .
Worked example — concrete scenario with numbers
Scenario: A manufacturer intends to certify a 1‑3/4‑inch thick exterior swinging door assembly with polymeric glazing stops and a plastic gasket used on a CWUIC‑regulated structure.
- The manufacturer must have the door assembly evaluated under the positive‑pressure door test identified by the CWUIC: UL 10C (Positive Pressure Fire Tests of Door Assemblies) because § 504.9 points to UL 10C as the positive‑pressure door test standard .
- Any polymeric or plastic components (e.g., glazing stops, gaskets) that require flammability evaluation must be tested to UL 94 as mapped in § 504.9.2 (for parts) or otherwise follow the CWUIC‑listed procedures; if an accelerated exposure method is required for durability prior to flammability testing, ASTM G155 is the practice referenced in association with § 504.9.2 .
- Outcome: Obtain a UL 10C test report / label for the full assembly and UL 94 classification reports for the plastic parts; submit those listing/test reports as evidence of compliance where the CWUIC requires the assembly test and the parts’ flammability evaluation (referenced by § 504.9 and § 504.9.2) .
Related provisions (CWUIC)
- § 504.5 — (related exterior wall/penetration fire tests mapped to ASTM E2707)
- § 504.9.3 — (the referenced‑standards list links ASTM E2707 to § 504.9 and § 504.9.3)
- § 504.10.1 — (vents / ember‑resistance testing referenced elsewhere in Chapter 7)
If you need, I can pull the exact CWUIC text of § 504.9 and § 504.9.2 (the body language of those sections) from your uploaded files so we can quote the code text verbatim and cross‑link it to the exact paragraph that references UL 10C and UL 94. The referenced‑standards listing shown in the uploaded CWUIC files already confirms the standard ↔ section mappings above .
Code references
Grounded in the retrieved California Wildland-Urban Interface Code — click a citation to read the verbatim passage:
CWUIC § 7-4 High relevance — show source text
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REFERENCED STANDARDS
10C—2016: Positive Pressure Fire Tests of Door Assemblies—with Revisions through May 2021
504.9
94—2023: Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
504.9.2
263—2011: Fire Tests of Building Construction and Materials—with Revisions through March 2022
501.3, 504.3, 504.3.1, 504.5, 504.7, 504.7.1
723—2018: Test for Surface Burning Characteristics of Building Materials
202, 501.4.1, 503.2.4, 504.7.3.2, 504.7.3.3
790— 2022 : Standard Test Methods for Fire Tests of Roof Coverings
504.2, 504.2.1.2, 504.11.6
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CALIFORNIA WILDLAND-URBAN INTERFACE CODE – MATRIX ADOPTION TABLE
APPENDIX A – GENERAL REQUIREMENTS
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
(Not adopted by the State Fire Marshal)
Adopting Agency BSC BSC-
CGSFM Col5 HCD Col7 Col8 DSA Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGT-24 T-19* 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt Entire Chapter Adopt Entire Chapter as
amended (amended sections
listed below)Adopt only those sections that
are listed below[California Code of Regulations,
Title 19, Division 1]Chapter / Section CWUIC § 12-7 High relevance — show source text
504.8
12-7A-3: Horizontal Projection Underside. A fire resistance test standard consisting of a 300 kW intensity direct flame exposure for a 10-minute duration
504.3, 504.7, 504.7.1
12-7A-4: Decking. A two-part test consisting of a heat release rate (Part A) deck assembly combustion test with an under deck exposure of 80 kW intensity direct flame for a 3-minute duration, and a (Part B) sustained deck assembly combustion test consisting of a deck upper surface burning ember exposure with a 12 mph wind for 40 minutes using a 2.2 lb (1kg) burning “Class A” size 12" × 12" × 2.25" (300 mm × 300 mm × 57 mm) roof test brand
504.7.3.2
12-7A-4A: Decking Alternate Method A. A heat release rate deck assembly combustion test with an under deck exposure of 80 kW intensity direct flame for a 3-minute duration
504.7.3.2
State Fire Marshal’s Guidelines for Fire Hydrant Markings Along State Highways and Freeways, May 1988
404.8
UL UL LLC, 333 Pfingsten Road, Northbrook, IL 60062-2096
9—2009: Fire Tests of Window Assemblies—with Revisions through March 2020
504.8
10B—2008: Fire Tests of Door Assemblies—with Revisions through May 2020
504.9
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REFERENCED STANDARDS
10C—2016: Positive Pressure Fire Tests of Door Assemblies—with Revisions through May 2021
504.9
94—2023: Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
504.9.2
263—2011: Fire Tests of Building Construction and Materials—with Revisions through March 2022
501.3, 504.3, 504.3.1, 504.5, 504.7, 504.7.1
723—2018: Test for Surface Burning Characteristics of Building Materials
202, 501.4.1, 503.2.4, 504.7.3.2, 504.7.3.3
790— 2022 : Standard Test Methods for Fire Tests of Roof Coverings
504.2, 504.2.1.2, 504.11.6
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CALIFORNIA WILDLAND-URBAN INTERFACE CODE – MATRIX ADOPTION TABLE
APPENDIX A – GENERAL REQUIREMENTS
CWUIC § 1404.7.1 High relevance — show source text
602—2022: Specification for Masonry Structures
1404.7.1, 1705.4, 1705A.4, 1705.4.1, 1807.1.6.3, 2101.2.2, 2101A.1.3, 2103.1, 2103.2.1, 2103.3, 2103A.3.1, 2103.4, 2104.1, 2104.2, 2104A, 2105.1, 2105A.1, 2105.2, 2105A.2, 2105.3, 2105A.3, 2106.6, 2115.3, 2115.4
604—2023: Standard for the Installation of Architectural Cast Stone
2104.1
TPI Truss Plate Institute, 2670 Crain Highway, Suite 203, Waldorf, MD 20601
ANSI/TPI 1—2022: National Design Standard for Metal Plate Connected Wood Truss Construction
2303.4.6, 2306.1
UBC International Code Council, Inc., 500 New Jersey Avenue, NW 6th Floor, Washington, DC 20001
UBC Standard 15-2: Test Standard for Determining the Fire Retardancy of Roof-Covering Materials
1505.6
UBC Standard 15-3: Wood Shakes
1505.6
UBC Standard 15-4: Wood Shingles
1505.6
UL UL LLC, 333 Pfingsten Road, Northbrook, IL 60062
9—2009: Fire Tests of Window Assemblies—with Revisions through March 2020 Table 716.1(1), 716.1.1, 716.1.2.2.2, 716.2.1.3, 716.3.1.1, 716.3.1.2, 716.3.2.1.3, 716.3.4, 1013.5
10A—2009: Tin Clad Fire Doors—with Revisions through July 20, 2018
716.2.1
10B—2008: Fire Tests of Door Assemblies—with Revisions through May 2020 Table 716.1(1), 716.1.1, 716.1.2.2.1, 716.2.1.2, 716.2.2.2, 716.2.2.3.1, 716.2.5.1.1
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REFERENCED STANDARDS
10C—2016: Positive Pressure Fire Tests of Door Assemblies—with Revisions through May 2021 Table 716.1(1), 716.1.1, 716.1.2.2.1, 716.2.1.1, 716.2.2.1, 716.2.2.2, 716.2.2.3.1, 716.2.5.1.1, 1010.2.8.3
10D—2017: Fire Tests of Fire-Protective Curtain Assemblies
716.4
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
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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 § 12-7 High relevance — show source text
(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.
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FIRE-RESISTIVE STANDARDS
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12-7-4 FIRE-RESISTIVE STANDARDS
FIRE DOOR ASSEMBLY TESTS
STANDARD 12-7-4
STATE FIRE MARSHAL
SCOPE
Sec. 12-7-400.
(a) Application. These methods of fire tests are applicable to door assemblies of various materials and types of construction for use in wall openings to retard the passage of fire (flame, heat and smoke).
(b) Performance. Tests made in conformity with these test methods will register performance during the test exposure, but such tests shall not be construed as determining suitability for use after exposure to fire.
(c) Suitability of assemblies. It is the intent that tests made in conformity with these test methods will develop data to enable enforcing agencies to determine the suitability of door assemblies for use in locations where fire resistance of a specified duration is required.
FIRE TESTING FURNACES AND CONTROL
Sec. 12-7-401.
(a) Furnaces. Fire testing furnaces and their control shall conform to SFM 12-7-3, Fire Testing Furnaces, Section 12-7-301 (a), Vertical Large-scale Wall Furnaces.
CWUIC § 716.1.2.3.1 High relevance — show source text
716.1.2.3.1 Glazing in fire door and fire window assemblies. Fire-resistance-rated glazing shall be permitted in fire door and fire window assemblies where tested and installed in accordance with their listings and where in compliance with the requirements of this section.
716.2 Fire door assemblies. Fire door assemblies required by other sections of this code shall comply with the provisions of this section. Fire door frames with transom lights, sidelights or both shall be permitted in accordance with Section 716.2.5.4.
716.2.1 Testing requirements. Approved fire door and fire shutter assemblies shall be constructed of any material or assembly of component materials that conforms to the test requirements of Sections 716.2.1.1 through 716.2.1.4 and the fire protection rating indicated in Table 716.1(2).
Exceptions:
Labeled protective assemblies that conform to the requirements of this section or UL 10A, UL 14B and UL 14C for tinclad fire door assemblies.
Floor fire door assemblies in accordance with Section 712.1.13.1.
716.2.1.1 Side-hinged or pivoted swinging doors. Fire door assemblies with side-hinged and pivoted swinging doors shall be tested in accordance with NFPA 252 or UL 10C. For tests conducted in accordance with NFPA 252, the fire test shall be conducted using the positive pressure method specified in the standard.
716.2.1.2 Other types of assemblies. Fire door assemblies with other types of doors, including swinging elevator doors, horizontal sliding fire doors, rolling steel fire doors, fire shutters, bottom- and side-hinged chute intake doors, and top-hinged chute discharge doors, shall be tested in accordance with NFPA 252 or UL 10B. For tests conducted in accordance with NFPA 252, the neutral pressure plane in the furnace shall be maintained as nearly equal to the atmospheric pressure as possible at the top of the door, as specified in the standard.
716.2.1.3 Glazing in transoms lights and sidelights in corridors and smoke barriers. Glazing material in any other part of the door assembly, including transom lights and sidelights, shall be tested in accordance with NFPA 257 or UL 9, including the hose stream test, in accordance with Section 716.3.1.1.
716.2.1.4 Smoke and draft control. Fire door assemblies that serve as smoke and draft control assemblies shall be tested in
accordance with UL 1784.
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FIRE AND SMOKE PROTECTION FEATURES
716.2.2 Performance requirements. Fire door assemblies shall be installed in the assemblies specified in Table 716.1(2) and shall comply with the fire protection rating specified.
716.2.2.1 Door assemblies in corridors and smoke barriers. Fire door assemblies required to have a minimum fire protection rating of 20 minutes where located in corridor walls or smoke barrier walls having a fire-resistance rating in accordance with Table 716.1(2) shall be tested in accordance with NFPA 252 or UL 10C without the hose stream test.
CWUIC § 909.20.2.2 High relevance — show source text
909.20.2.2 Vestibule doors. Where access to the stairway is by way of a vestibule, the door assembly from the building into the vestibule shall be a 90-minute fire door assembly complying with Section 716.5.5. The door assembly from the vestibule to the stairway shall have not less than a 20-minute fire protection rating and shall comply with the requirements for a smoke door assembly in accordance with Section 716.5.3. The door shall be installed in accordance with NFPA 105.
909.20.2.3 Standpipes. Where access to the stairway is by way of a vestibule, Fire department standpipe connections and valves serving the floor shall be within the vestibule unless otherwise approved by the fire code official. Standpipe connections in vesti- bules shall be located in such a manner so as not to obstruct egress where hose lines are connected and charged.
909.20.2.4 Pressure differences. The minimum pressure differences within the vestibule with the doors closed shall be 0.05-inch water gage (12.44 Pa) positive pressure relative to the fire floor and 0.05-inch water gage (12.44 Pa) negative pressure relative to the exit enclosure. No pressure difference is required relative to a nonfire floor.
909.20.2.5 Relief vent. A relief vent capable of discharging a minimum of 2,500 cubic feet per minute (1180 L/s) of air at the design pressure difference shall be located in the upper portion of such pressurized exit enclosures.
Exception: When approved by the enforcing agency, other engineered design methods capable of discharging a minimum of 2,500 cubic feet per minute (1180 L/s) of air at the design pressure difference shall be permitted.
909.20.3 Natural ventilation alternative. The provisions of Sections 909.20.3.1 through 909.20.3.3 shall apply to ventilation of smokeproof enclosures by natural means.
909.20.3.1 Balcony doors. Where access to the stairway or ramp is by way of an open exterior balcony, the door assembly into the enclosure shall be a fire door assembly in accordance with Section 716.
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FIRE PROTECTION AND LIFE SAFETY SYSTEMS
909.20.3.2 Vestibule ventilation. Where access to the stairway is by way of a vestibule, each vestibule shall have a minimum net area of 16 square feet (1.5 m [2] ) of opening in a wall facing an outer court, yard or public way that is not less than 20 feet (6096 mm) in width.
909.20.4 Reserved.
909.20.4.1 Pressure differences. The pressurization system shall be designed so that the minimum pressure differences provided within the vestibule with the doors closed shall be 0.05-inch water gage (12.44 Pa) positive pressure relative to the fire floor and 0.05-inch water gage (12.44 Pa) negative pressure relative to the exit enclosure. No pressure difference is required relative to a nonfire floor.
CWUIC § 716.2.9.1.1 High relevance — show source text
716.2.9.1.1 Light kits, louvers and components. Listed light kits and louvers and their required preparations shall be considered as part of the labeled door where such installations are done under the listing program of the third-party agency. Fire doors and fire door assemblies shall be permitted to consist of components, including glazing, vision light kits and hardware that are listed or classified and labeled for such use by different third-party agencies.
716.2.9.2 Oversized doors. Oversized fire doors shall bear an oversized fire door label by an approved agency or shall be provided with a certificate of inspection furnished by an approved testing agency. Where a certificate of inspection is furnished by an approved testing agency, the certificate shall state that the door conforms to the requirements of design, materials and construction, but has not been subjected to the fire test.
716.2.9.3 Smoke and draft control door labeling requirements. Smoke and draft control doors complying with UL 1784 shall be labeled in accordance with Section 716.2.9.1 and shall show the letter “S” on the fire-rating label of the door. This marking shall indicate that the door and frame assembly are in compliance where listed or labeled gasketing is installed.
716.2.9.4 Fire door frame labeling requirements. Fire door frames shall be labeled showing the names of the manufacturer and the third-party inspection agency.
Exception: In Group I-3 doors that are required to be 45 minutes or higher shall be fire-rated assemblies or certified by the manu- facturer as being equivalent to the required standard.
716.2.9.5 Labeling. Fire-rated glazing shall bear a label or other identification showing the name of the manufacturer, the test standard and information required in Table 716.1(1) that shall be issued by an approved agency and shall be permanently identified on the glazing.
716.2.9.6 Fire door operator labeling requirements. Fire door operators for horizontal sliding doors shall be labeled and listed for use with the assembly.
716.2.10 Installation of door assemblies in corridors and smoke barriers. Installation of smoke doors shall be in accordance
with NFPA 105.
716.3 Fire window assemblies. Fire window assemblies required by other sections of this code shall comply with the provisions of this section.
716.3.1 Testing requirements. Fire window assemblies shall be constructed of any material or assembly of component materials that conforms to the test requirements of Sections 716.3.1.1 and 716.3.1.2 and the fire protection rating indicated in Table 716.1(3).
716.3.1.1 Testing under positive pressure. NFPA 257 or UL 9 shall evaluate fire-protection-rated glazing under positive pressure. Within the first 10 minutes of a test, the pressure in the furnace shall be adjusted so not less than two-thirds of the test specimen is above the neutral pressure plane, and the neutral pressure plane shall be maintained at that height for the balance of the test.
716.3.1.2 Nonsymmetrical glazing systems. Nonsymmetrical fire-protection-rated glazing systems in fire partitions, fire barriers or in exterior walls with a fire separation distance of 10 feet (3048 mm) or less pursuant to Section 705 shall be tested with both faces exposed to the furnace, and the assigned fire protection rating shall be the shortest duration obtained from the two tests conducted in compliance with NFPA 257 or UL 9.
CWUIC § 504.3 High relevance — show source text
504.3 Protection of enclosed eaves. The exposed underside of enclosed roof eaves and soffits shall be protected on the exposed underside by one or more of the following:
1. Noncombustible materials.
2. Ignition-resistant building materials. 3. Materials approved for not less than 1-hour fire-resistance-rated construction on the exterior side, as tested in accordance with ASTM E119 or UL 263.
4. 2-inch (51 mm) nominal dimension lumber . 5. 1-inch (25 mm) nominal fire-retardant-treated lumber or [3] / 4 -inch (19.1 mm) nominal fire-retardant-treated plywood, identified for exterior use and complying with Section 2303.2 of the California Building Code . 6. Boxed-in roof eave soffit assemblies with an underside that meets the performance criteria in Section 504.7.2 when tested in accordance with the test procedures set forth in ASTM E2957. 7. Boxed-in roof eave soffit assemblies with an underside that meets the performance criteria in accordance with the test proce- dures set forth in SFM Standard 12-7A-3.
Facias are required and shall be ignition-resistant building materials , fire-retardant-treated wood labeled for exterior use and complying with Section 2303.2 of the California Building Code, materials approved for not less than 1-hour fire-resistance-rated construction or 2-inch (51 mm) nominal dimension lumber.
504.3.1 Protection of open eaves. The exposed roof deck on the underside of unenclosed roof eaves shall consist of one or more of the following:
1. Noncombustible material.
2. Ignition-resistant building material. 3. Fire-retardant-treated wood labeled for exterior use and complying with Section 2303.2 of the California Building Code. 4. Materials approved for not less than 1-hour fire-resistance-rated construction on the exterior side, as tested in accordance with ASTM E119 or UL 263.
5. 2-inch (51 mm) nominal dimension lumber. 6. One layer of [5] / 8 -inch (16 mm) Type X gypsum sheathing applied behind an exterior covering on the underside of the roof deck.
7. The exterior portion of a 1-hour fire-resistance-rated exterior assembly, as tested in accordance with ASTM E119 or UL 263, applied to the underside of the roof deck designed for exterior fire exposure, including assemblies using the gypsum panel and sheathing products listed in the Gypsum Association Fire Resistance Design Manual.
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SPECIAL BUILDING CONSTRUCTION REGULATIONS
Facias, if provided, shall be of fire-retardant-treated wood labeled for exterior use and complying with Section 2303.2 of the Cali- fornia Building Code, ignition-resistant building materials, materials approved for not less than 1-hour fire-resistance-rated construction or 2-inch (51 mm) nominal dimension lumber.
CWUIC § 716.2.9.6 High relevance — show source text
716.2.9.6 Fire door operator labeling requirements. Fire door operators for horizontal sliding doors shall be labeled and listed for use with the assembly.
716.2.10 Installation of door assemblies in corridors and smoke barriers. Installation of smoke doors shall be in accordance
with NFPA 105.
716.3 Fire window assemblies. Fire window assemblies required by other sections of this code shall comply with the provisions of this section.
716.3.1 Testing requirements. Fire window assemblies shall be constructed of any material or assembly of component materials that conforms to the test requirements of Sections 716.3.1.1 and 716.3.1.2 and the fire protection rating indicated in Table 716.1(3).
716.3.1.1 Testing under positive pressure. NFPA 257 or UL 9 shall evaluate fire-protection-rated glazing under positive pressure. Within the first 10 minutes of a test, the pressure in the furnace shall be adjusted so not less than two-thirds of the test specimen is above the neutral pressure plane, and the neutral pressure plane shall be maintained at that height for the balance of the test.
716.3.1.2 Nonsymmetrical glazing systems. Nonsymmetrical fire-protection-rated glazing systems in fire partitions, fire barriers or in exterior walls with a fire separation distance of 10 feet (3048 mm) or less pursuant to Section 705 shall be tested with both faces exposed to the furnace, and the assigned fire protection rating shall be the shortest duration obtained from the two tests conducted in compliance with NFPA 257 or UL 9.
716.3.2 Performance requirements. Fire window assemblies shall be installed in the assemblies and comply with the fire protection rating specified in Table 716.1(3).
716.3.2.1 Interior fire window assemblies. Fire-protection-rated glazing used in fire window assemblies located in fire partitions and fire barriers shall be limited to use in assemblies with a maximum fire-resistance rating of 1 hour in accordance with this section.
716.3.2.1.1 Where [3] / 4 -hour-fire-protection window assemblies permitted. Fire-protection-rated glazing requiring 45minute opening protection in accordance with Table 716.1(3) shall be limited to fire partitions designed in accordance with Section 708 and fire barriers utilized in the applications set forth in Sections 707.3.6, 707.3.7 and 707.3.9 where the fire-resistance rating does not exceed 1 hour. Fire-resistance-rated glazing assemblies tested in accordance with ASTM E119 or UL 263 shall not be subject to the limitations of this section.
716.3.2.1.1.1 Energy storage system separation. Fire-protection-rated glazing is not permitted for use in fire window assemblies in fire barriers required by Section 1207 of the California Fire Code to enclose energy storage systems.
716.3.2.1.2 Area limitations. The total area of the glazing in fire-protection-rated window assemblies shall not exceed 25 percent of the area of a common wall with any room.
2025 CALIFORNIA BUILDING CODE 7-33
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
FIRE AND SMOKE PROTECTION FEATURES
CWUIC § 909.20.3 High relevance — show source text
909.20.3 Natural ventilation alternative. The provisions of Sections 909.20.3.1 through 909.20.3.3 shall apply to ventilation of smokeproof enclosures by natural means.
909.20.3.1 Balcony doors. Where access to the stairway or ramp is by way of an open exterior balcony, the door assembly into the enclosure shall be a fire door assembly in accordance with Section 716.
2025 CALIFORNIA BUILDING CODE 9-49
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
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FIRE PROTECTION AND LIFE SAFETY SYSTEMS
909.20.3.2 Vestibule ventilation. Where access to the stairway is by way of a vestibule, each vestibule shall have a minimum net area of 16 square feet (1.5 m [2] ) of opening in a wall facing an outer court, yard or public way that is not less than 20 feet (6096 mm) in width.
909.20.4 Reserved.
909.20.4.1 Pressure differences. The pressurization system shall be designed so that the minimum pressure differences provided within the vestibule with the doors closed shall be 0.05-inch water gage (12.44 Pa) positive pressure relative to the fire floor and 0.05-inch water gage (12.44 Pa) negative pressure relative to the exit enclosure. No pressure difference is required relative to a nonfire floor.
909.20.4.2 Relief vent. A relief vent capable of discharging a minimum of 2,500 cubic feet per minute (1180 L/s) of air at the design pressure difference shall be located in the upper portion of such pressurized exit stairway or ramp enclosures.
Exception: When approved by the enforcing agency, other engineered design methods capable of discharging a minimum of 2,500 cubic feet per minute (1180 L/s) of air at the design pressure difference shall be permitted.
909.20.5 Pressurized stair and vestibule alternative. The provisions of Sections 909.20.5.1 through 909.20.5.3 shall apply to smokeproof enclosures using a pressurized stair and pressurized entrance vestibule.
909.20.5.1 Vestibule doors. The door assembly from the building into the vestibule shall be a fire door assembly complying with Section 716.2.2.1. The door assembly from the vestibule to the stairway shall have not less than a 20-minute fire protection rating and meet the requirements for a smoke door assembly in accordance with Section 716.2.2.1. The door shall be installed in accordance with NFPA 105.
909.20.5.2 Pressure difference. The stair enclosure shall be pressurized to not less than 0.05 inch of water gage (12.44 Pa) positive pressure relative to the vestibule with all stairway doors closed under the maximum anticipated stack pressures. The vestibule, with doors closed, shall have not less than 0.05 inch of water gage (12.44 Pa) positive pressure relative to the fire floor. The pressure difference across doors shall not exceed 30 pounds (133-N) maximum force to begin opening the door.
CWUIC § 4.1 Medium relevance — show source text
4|Combustible
materials|N||||||||| |A105.4.1|Individual piles|N||||||||| |A105.4.2|Separation|N||||||||| |A106|Dumping|N||||||||| |A106.1|Waste material|N||||||||| |A106.2|Ashes and coals|N||||||||| |A107|Protection of pumps
and water storage
facilities|N||||||||| |A107.1|General|N||||||||| |A107.2|Objective|N||||||||| |A107.3|Fuel modification
area|N||||||||| |A107.4|Trees|N||||||||| |A107.5|Protection of electri-
cal power supplies|N||||||||| |A108|Land use limitations|N||||||||| |A108.1|General|N||||||||| |A108.2|Objective|N||||||||| |A108.3|Permits|N||||||||| |A108.4|Access roadways|N||||||||| |A109|Referenced standards|N||||||||| |A109.1|General|N|||||||||APPENDIX H-34 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS
2025 CWUIC—continued Col2 Adopted
Yes/NoIWUIC
SectionCBC
SectionCFC
SectionTitle 14,
Division 1.5
SectionTitle 19,
Division 1
SectionGov Code
SectionPRC
SectionHSC
SectionSection Title Title Title Title Title Title Title Title Title Title Appendix B Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan Vegetation management plan B101 General N B101.1 Scope N B101.2 Plan content N B101.3 Fuel modification N Appendix C Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework **_Community Wildland-Urban Interface (WUI)
Frequently asked questions
Which standard does the CWUIC require for positive‑pressure door testing?
The CWUIC references UL 10C — Positive Pressure Fire Tests of Door Assemblies for positive‑pressure testing of door assemblies under § 504.9 .
Where does CWUIC say to test plastic parts used in door assemblies?
Plastic parts used in assemblies are tied to UL 94 — Tests for Flammability of Plastic Materials for Parts by § 504.9.2; the referenced‑standards table maps UL 94 to that section .
Are there other test standards linked to § 504.9?
Yes — ASTM E2707 (fire penetration/direct flame methods) is listed in the CWUIC referenced‑standards mapping in association with § 504.9 and related subsections; consult the referenced‑standards chapter for the full list .
Does CWUIC reproduce the full test procedures?
No — the CWUIC referenced‑standards chapter lists the standard titles and the CWUIC sections that reference them; you must obtain and follow the full text of the named standard (e.g., UL 10C, UL 94, ASTM G155) to perform or evaluate tests .
How does this relate to the California Building Code?
The CBC and other California codes also reference door test standards (for example, CBC allows UL 10C or NFPA 252 in certain sections); however, for CWUIC applications you should follow the standards the CWUIC specifically maps to its sections (see § 504.9 and § 504.9.2) .
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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