This cheat is an alternate way to get up onto the rooftop next to the tractor.
Face the door you use to go upstairs.
Do not go inside. Turn right and jump up onto the ledge next to the stack of wood.
Run (but don't sprint) and jump onto the second ledge.
Carefully walk onto the smaller roof.
If you look left you can look inside the second storey.
Now stand next to the wall and run (sprint not needed) and jump while looking left.
Looking left while you jump will cause you to jump left at an angle. Now you're on the roof!