When installing the top hangers to the bottom of the floor joist, there is a good chance that a top hanger will end between the joists. In this case, you will simply abut a new top hanger to the end of the previous one, putting a screw through the new top hanger at the first available floor joist. You will notice that the ends of the top hangers will sag. As a temporary hold, you can cut a 6-inch piece of a runner and snap it over the seam between the two top hangers. When you get to the final step in the installation process (Installing the Runners), you can snap out the 6-inch piece and snap in a full-length runner (8-foot). Another option would be to install a 2×4 at the point where the two top hangers meet. You would then be able to screw the end of each top hanger to that 2×4.