[Troy DeGroot]

You’re correct @David Cutler the area you draw is the footprint. when you add a slope you’re essentially stretching part of it vertically and creating a slope you cannot see in plan. I think we are all saying the same thing. The length of the perimeter does not update reflecting the slope, so you can no longer make it visible. The shape of the area will not matter in the calculation, it takes the entire thing into the equation.

I used to trace each face until I came to the realization the pitch was the same whether you trace both sides of a pitch in one markup or two.