http://www.homebuildingandrepairs.com... Click on this link for more information about floor framing, subfloor nailing and other helpful ideas for your next home improvement project. This video will provide you with a general idea about nail spacing or the distance nails should be placed apart from each other when attaching plywood or oriented strand board to floor framing members like joist or beams. Remember that engineers usually provide nail sizes and spacing on building plans and might need to be consulted on larger projects.