BonnaVilla® Homes installs 3/4" tongue & groove floor sheathing perpendicular to the floor joists. Interlocking the sheathing and staggering the seams eliminates continuous seams across the entire width of the home. Sturdy floors are obtained by gluing the tongue and groove, and gluing and stapling the sheathing to the floor joists. 2"x10" Floor Joist is 16" on Center on IRC Homes. 2"x8" Floor Joist is 16" on Center on HUD Homes.