01
Develop the radial geometry
Measure slope length and circumference at key heights. Establish course lines and the number of pieces per course, then determine where widths taper or piece counts change.
02
Avoid weak narrow tails
Tapered slate needs enough width at the head for fastening and enough body to remain strong. When geometry becomes too tight, a designed metal cap or transition may be better than forcing tiny stone pieces.
03
Coordinate the base and peak
The turret-to-main-roof intersection, valleys or saddles below, and finial or cap above should be detailed as one assembly. These are difficult areas to repair after surrounding slate is complete.