TT-205 T&G Cedar Siding - Nominal 1x6 and wider — type figure.
Drawn from this record's own sourced values; every dimension on it is one a
published document states, and a parameter the source did not publish is
named on the drawing rather than estimated.
CC BY 4.0.
TT-205 T&G Cedar Siding - Nominal 1x6 and wider
This is a listed siding assembly. Listing 8140-2294:0500. This site cites SFM 12-7A-1. Match the model and orientation.
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TT-205 T&G Cedar Siding, nominal 1x6 and wider, is listed by CAL FIRE for wildfire-area use.
The listing covers Defiance Forest Products’ Rainier Plank Model TT-205 as a siding assembly under number 8140-2294:0500 in OSFM category 8140. It appeared in the 2025 OSFM WUI Listed Products Handbook, and the live Building Materials Listing dated August 25, 2026, shows an expiration date of June 30, 2027.
CAL FIRE identifies SFM 12-7A-1 as the applicable test protocol. The listing is specific to TT-205 tongue-and-groove cedar siding in the stated nominal width, not cedar siding as a general material category. Specification and installation should therefore match the exact model, dimensions, manufacturer’s installation instructions, and product data sheets. Because listing status can change, confirm the live CAL FIRE listing before specifying the assembly.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
TT-205 T&G Cedar Siding - Nominal 1x6 and wider. FireApproved. https://fireapproved.com/materials/defiance-forest-products-tt-205-t-g-cedar-siding-nominal-1x6-and-wider/. Last verified 2026-08-23.
