Flat roofs, parapets, and shared walls
Attached and semi-attached housing in Astoria and Ridgewood is dominated by low-slope roofs — modified bitumen, torch-down, and older built-up assemblies with parapet walls, chimney flashings, and scuppers that clog every fall. Leaks in those buildings rarely appear above their source, and a stain in a top-floor bedroom often traces back to a neighbor's parapet or a shared party wall.
That has a business consequence: the caller may not own the surface causing the leak. Establishing whether the building is attached, who owns the roof, and whether the adjoining owner has to be involved prevents an inspection that ends with a conversation you cannot bill.