@box said:
@unknownuser said:
Or simply select top view, then Cmera, parrallel projection, zoom extents, save scene.
That would give you a plan view of an angled roof distorting the relevant sizes, whereas align view would give you a "parallel projection" of the actual size.
Here is the same roof from overhead and align view.
My apologies, I didn't read all the way through. In your case then:
Select face, align view, camera, parrallel projection, zoom extents, save scene.
Saving the scene allows you to not go through this each time.