Hi Brian Babcock,

You don't need to rotate the roof to change the dims. You can use the # selector (second arrow, with a # symbol)--> point the roof side and change the dimension
If you created a freehand roof, you can select (with the first arrow) each point --> move it (X or Y) with the key board arrows
Or, with the point selected--> Edit--> Move--> write the distance you wish to move the point (X and / or Y)

Hope this helps

Patricia