United States / Build / Timber Products Company (8140-2343:0502)

Timber Products Company (8140-2343:0502)

Name: Timber Products Company (8140-2343:0502)
Brand: Timber Products Company

This is a listed siding assembly. Listing 8140-2343:0502. This site cites SFM 12-7A-1. Match the model and orientation.

Kind: listed-assembly. Brand: Timber Products Company. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-23. JSON (CC BY 4.0)

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California listing 8140-2343:0502 covers Timber Products' specified APA 303 five-ply Okoume reverse-board-and-batten siding assembly.

The APA 303 five-ply panel is nominally 19/32 inch thick and 4 feet by 8 feet or taller. Grooves may be no wider than 1-1/2 inches, with spacing of at least 12 inches. Listing 8140-2343:0502 specifies nominal 2-by-4-inch studs at 16 inches on center and 8d nails measuring 2-1/2 inches long.

These dimensions separate this reverse-board-and-batten product from other plywood profiles. The September 2025 OSFM handbook places it in exterior wall category 8140 and names SFM 12-7A-1 as the test protocol. Check the groove geometry, panel size, framing, and fastening together when reviewing a wall specification. Confirm the current listing for this exact Timber Products model, then use the manufacturer's installation instructions and product data sheets.

Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Fire
Test standard	sfm 12 7a 1	OSFM Building Materials Listing — 8140-2343:0502 (official-listing · Listing 8140-2343:0502, TEST PROTOCOL)TEST PROTOCOL: SFM 12-7A-1

Published requirement matches

These links are generated from the cited attributes above. They do not decide installation or a project result.

California SFM 12-7A-1 wall · California mapped fire hazard areas

Program	ID / source	Evidence date	Expires	Status
CAL FIRE BML	8140-2343:0502 · Search BML for 8140-2343:0502	2026-08-25	2027-06-30	listed

Tests and programs cited

SFM 12-7A-1 · test-method
OSFM BML · listing-program

Specification notes

Listing is from the OSFM WUI handbook. Confirm the live GOVmotus record and the exact model before specification.

Can I use this here

Local force

The rule and every matching product for the United States

Requirement constraints (16)

Each table compares this product's documented attributes with one published requirement. The comparison does not change from place to place, so it is printed once.

ORSC R327 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

IWUIC Class 1 wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

California one-hour exterior wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

California SFM 12-7A-1 wall matched
Field	Required	Documented value	State
Test standard	Test standard = sfm 12 7a 1	sfm 12 7a 1	matched

Colorado CWRC noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Colorado CWRC wall-base protection undocumented
Field	Required	Documented value	State
Assembly role	Assembly role = wall base protection	Not documented	undocumented
Height	Height ≥ 6 in	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2018 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Kittitas IR1 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

Kittitas Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2021 IWUIC Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 noncombustible wall undocumented
Field	Required	Documented value	State
Noncombustible	Noncombustible = Yes	Not documented	undocumented

2006 Utah UWUI Class 1–2 one-hour wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented

2006 Utah UWUI Table 503.1 N.C. wall undocumented
Field	Required	Documented value	State
Fire resistance	Fire resistance ≥ 60 min	Not documented	undocumented
Noncombustible	Noncombustible = Yes	Not documented	undocumented

Sources

2025 OSFM WUI Listed Products Handbook (2 September 2025) — CAL FIRE OSFM (official). Accessed 2026-08-23.
OSFM Building Materials Listing search — CAL FIRE OSFM (listing-body). Accessed 2026-08-23.

Timber Products Company (8140-2343:0502). FireApproved. https://fireapproved.com/materials/timber-products-company-8140-2343-0502/. Last verified 2026-08-23.