When building you will need to cut and notch all the joists, but in sketchup you can just copy the one you have made already to the other locations between the same two frames.

  • Align the ground floor end joists flush with the ends of the joist bearers (these are one timber width inside the grid, so that the external walls will be on the grid)
  • Align the remaining joists with the grid lines on the ground floor – copy multiple will help speed this process up
  • Do the same for the ceiling joists – these can be mostly copied vertically from the ground floor joists to speed things up, although the end joists will be spaced differently