United States / Build / Sierra/Savannah Lap Siding, 1/2" thick fiber cement boards
Sierra/Savannah Lap Siding, 1/2" thick fiber cement boards — 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.
Sierra/Savannah Lap Siding, 1/2" thick fiber cement boards
This is a material class, not a wall or roof assembly listing. Listing 8170-2029:0006.
Kind: material-class.
Brand: Nichiha USA, Inc.. Listing evidence: OSFM WUI handbook 2026-08-25.
Page reviewed 2026-08-26. JSON (CC BY 4.0)
Enter your ZIP to see which local requirement this meets.
Nichiha Sierra/Savannah Lap Siding is listed as an ignition-resistant material in its 1/2-inch fiber-cement board form.
CAL FIRE entry 8170-2029:0006 names that lap siding and identifies ASTM E84 with an extended 20-minute test. The material description specifies board thickness, then refers the detailed product description and construction to the manufacturer's instructions and data sheets. It supplies no sheathing thickness or fastener schedule to reproduce as a wall assembly.
This distinction matters when the specification calls for lap siding: the listed object is the named Sierra/Savannah board, and its installation detail still needs the manufacturer's documentation. Preserve that model identification and thickness when matching the proposed product to GOVmotus. The extended test duration belongs with the ASTM E84 protocol; it is not a duration assigned to the finished wall.
Documents for this product
Each link opens the publisher's own copy, so you read the revision they are shipping today.
Covers Savannah Smooth and Sierra Premium Shake together. Its OVERLAP section states a minimum of 1-1/4" for both and a 2" maximum for Sierra Shake alone.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.
