01
Separate roof flashing from wall protection
Step or base flashing works with counterflashing to direct water back onto the roof while allowing the materials to move. Masonry reglets, siding transitions and cladding terminations must be detailed for the actual wall construction.
02
Large obstructions change drainage
Wide chimneys and curbs can hold snow, debris and water. Crickets or saddles may be needed to divide flow and prevent a flat collection area. The design should be established before field slate reaches the obstruction.
03
Keep penetrations serviceable
Plumbing vents, equipment and anchors should use durable flashings that can be inspected and renewed. Large exposed beads of sealant or cement are maintenance clues, not substitutes for correctly lapped metal and slate.