Vertical adjacency is evidence for coordination, not proof of a concealed path.
DOWNTOWN SEATTLE / GUIDE
Unit and Stack Map
Label confirmed routes, assumed links, inaccessible zones, and the source for each mark.
PRACTICAL GUIDE
Draw confirmed vertical relationships
Align units, floors, fixtures, branches, stacks, risers, shafts, and accessible service points on a property-specific diagram.
Avoid copying a generic tower diagram into the building record.
Leave concealed routes unresolved
Begin with verified unit and floor labels, fixture groups, accessible chases, valves, cleanouts, mechanical rooms, and prior work. Use different symbols for documented, observed, reported, and assumed routes so the map helps coordination without pretending to be an as-built drawing.
Attach later camera, leak-test, repair, and inspection findings to the same coordinates.