Sheathing Published September 21, 2011 at 640 × 480 in Second Session: Framing on Lorraine’s Sheathing If you are on layout, all of the OSB sheathing should go up just right. they are 8′ X 4′ sheets. The black lines show where the OSB should hit the studs for both advanced and standard framing. This makes nailing this stuff up so much easier.