01
Draw the boundary before work
Ask the contractor to mark the proposed area on a photograph or roof sketch. Discuss adjacent valleys, ridges, walls, and penetrations that could complicate the connection. A simple rectangle on a plan may not align with sensible course or flashing boundaries. Clarify which nearby components will be examined when the work is opened.
02
Record the retained conditions
Document the condition of neighboring slates and visible metal before starting. Ask how the repaired area will connect to existing courses without compromising the surrounding layout. If hidden deterioration extends beyond the planned boundary, obtain photographs and a revised scope. This approach makes it easier to understand the completed work and prevents later confusion about which part of the roof was actually renewed.