On-center spacing used with 4'times 8' sheathing and paneling are __ 16'' and 24'' 8'' and 12'' 12'' and 16'' 24'' and 36''

The correct answer is $16''$ and $24''$.<br /><br />On-center spacing refers to the spacing between the studs or joists in a building's framing. It is the distance between the centers of adjacent studs or joists.<br /><br />For $4'\times 8'$ sheathing and paneling, the typical on-center spacing used is $16''$ and $24'$. This means that the studs or joists are spaced $16''$ or $24''$ apart, measured from the center of one stud or joist to the center of the adjacent stud or joist.<br /><br />The $16''$ spacing is commonly used for interior walls, while the $24''$ spacing is commonly used for exterior walls or longer spans. This spacing provides adequate structural support and allows for proper installation of the sheathing and paneling.<br /><br />It is important to note that the specific on-center spacing requirements may vary depending on the type of building, the design, and the local building codes and regulations. It is always recommended to consult with a professional builder or engineer to ensure that the spacing meets the necessary structural and safety requirements.