Choreboy wrote:

A mansard roof looks like a hassle for construction

Well, the hardest part about our re-roofing job is the fact that the
Mansard has a curve in it. In order to get the shakes to make the
curve we first tried doing short courses but that seemed like a waste
of material so we instead soak full length shakes in water over night.
Wet, they bend nicely to the curve.