Fine Homebuilding with Jim Anderson demonstrates how to cut floor joists to length. Inspect the rim line to know where to set the joists. Set the joists to the layout on the rim line using a two man team. Tap a nail into the joist to keep it from moving around. Instead of standing the joists up to square them, cut them on both ends. Line the chalk line up with the rim line and snap the line across the joists to mark them. This will simultaneously measure and square them. Finally, line the joist square with the rim line and cut the joists to length. This method will put all the scrap out front and make it more accessible for a quick cleanup of the construction area.