Solid Wood Red Grandis Tongue and Groove Siding, material nominal 1" x 6", 1" x 8"

OSFM listing 8140-2318:0500 covers solid wood siding in nominal 1-by-6, 1-by-8 and 1-by-10-inch sizes. Its wall construction uses nominal 2-by-4-inch studs at 16 inches on center, with 7/16-inch exterior OSB sheathing. OSFM names SFM 12-7A-1 as the test protocol for this construction.

For the 6-inch siding, the listing calls for one siding nail per bearing, driven through the base of the tongue as a blind nail. The 8-inch and 10-inch pieces instead require face nailing with two nails per piece. In each case, the nail must reach 1-1/4 inches into solid wood. A change in board width therefore changes the specified nailing method, even within the same tongue-and-groove siding family.

Confirm the Urufor listing number in GOVmotus before specification. On the siding order and installation detail, match the board width to its fastening method and retain the stated sheathing and stud arrangement.