SIERRA PACIFIC INDUSTRIES (8140-2091:0104)

This is a listed siding assembly. Listing 8140-2091:0104. This site cites OSFM BML. Match the model and orientation.

The September 2, 2025 OSFM WUI handbook describes 8140-2091:0104 as follows: Solid-sawn “Wood” siding with no through holes or loose knots, installed over structural plywood or oriented strand board (OSB) with a 7/16” minimum thickness and complying with Voluntary Product Standard PS1 or Voluntary Product Standard PS2, with the following interlocking designs when installed in accordance with industrial technical guide. Refer to the manufacturer's installation instructions and product data sheets. Board and Batten: When applied in a vertical orientation with minimum nominal 8” wide and nominal 1” thick boards, and minimum nominal 4” wide and nominal 1-1/4” thick battens, with boards installed with a gap not more than ½”, with battens fastened to the wood frame with not less than 3” long fasteners at a schedule not more than 24” on center, and boards and battens made of a wood species “Redwood”, “Western Red Cedar”, “Incense Cedar”, “Port Orford Cedar”, “Alaska Yellow Cedar”, or any other wood species having a Flame Spread Rating not greater than 75 (Class B) when tested in accordance with ASTM E84. All nominal board sizes shall comply with the applicable provisions of American Softwood Lumber Standard DOC PS 20. Edge and end glued siding is permitted to be used interchangeably with solid sawn members. The recommended installation practice for solid wood siding in wall construction regarding butt and overlapping joints is: butt joints between pieces should be staggered a minimum of 12” and all butt joints should be flush with no gap. Nail joints into the studs or blocking members. One nail at each crossing with the wood frame support member shall be used for nominal 6” siding and 2 nails for nominal 8” or wider siding. Refer to the manufacturer's installation instructions and product data sheets.

Kind: listed-assembly. Brand: SIERRA PACIFIC INDUSTRIES. Listing evidence: OSFM WUI handbook 2026-08-25. Page reviewed 2026-08-26. JSON (CC BY 4.0)