Map every roof plane
Note pitch, material, valleys, dormers, chimneys, walls, skylights, plumbing vents, low-slope transitions, gutters, and drainage.
Look from the attic
When safely accessible, attic staining, frost, airflow, insulation gaps, and deck condition add context the exterior cannot.
Plan for winter
Eaves, shaded valleys, insulation, ventilation, snow shedding, and safe drainage matter through repeated freeze-thaw cycles.
Compare scopes, not totals
Ask what happens at the deck, eaves, valleys, walls, chimneys, penetrations, ridge, gutters, and cleanup.