01
Treat the break as a major transition
The change between upper and lower roof planes needs a complete flashing and drainage concept. Upper-roof runoff should not be driven behind the slate or decorative cornice.
02
Plan around windows and ornament
Dormer cheeks, heads, sills, curved trim and metalwork produce many short courses and cuts. Full elevations should coordinate joints and patterns before installation begins.
03
Consider steep-slope fastening
Near-vertical slate can expose undersides and fasteners differently from a conventional slope. Use accepted details for secure attachment and wind resistance without face patches that detract from the elevation.