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Millboard Envello, Board & Batten+ and Shadow Line+ siding are listed as a wall assembly under OSFM 8140-2379:0002.
The September 2025 handbook's description of that assembly identifies resin-composite tongue-and-groove boards for horizontal or vertical installation. It gives nominal sizes of 1 by 8 inches or 3/4 by 8 inches without assigning either size to an individual named profile. The board name and orientation therefore need to be checked with the assembly details.
Those details include 2-by-4-inch studs at 16 inches on center and 7/16-inch exterior OSB sheathing. The handbook describes 5/8-inch Type X gypsum as “stapled with Housewrap with Slicker Classic Rainscreen or HydroGap Drainable Housewrap.” Preserve those named materials and that qualification when consulting the installation documents; the sentence supplies no staple size or fastening schedule. Envello Décor aluminum trim may be installed at the cladding joints for decoration.
OSFM cites SFM 12-7A-1 for this wall assembly. A resin-composite board alone does not represent the construction described by the listing. Match the selected profile and wall components to the manufacturer's installation instructions and product data sheets, which the handbook expressly references, and confirm the exact GOVmotus entry before specification.
Documented attributes
Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.