What happens in the narrow gap between two houses?
When houses sit close together, a roof on one property can shed water toward the side wall of the next. The gutter, the drip edge and the flashing at the side wall are the three places to check first, and they are easy to miss from the sidewalk.
Ask the crew to show you where the water runs off each side of the roof on a rainy day. A simple photo of that run before the job starts makes it easier to settle any question about the shared side later.
Why do the tile and aluminum siding matter?
Portuguese builders in the Ironbound added tile and aluminum siding to many houses, so a roof edge may be partly hidden behind metal trim. A small leak at that edge can run behind the siding before it shows inside, which is why the trim is part of the roof inspection.
If the siding was added over an older exterior, ask whether the crew will pull the trim to check the flashing. That is a question about the house, not a guess about the material.
What does a factory and port history mean on the roof?
Districts that grew up around a factory, brewery and port often have buildings of different ages on one block. A residential roof can meet an older commercial wall, and the joint where they meet is a frequent place for trouble.
Point out any part of the building that is older or taller than the rest. A roofer who knows where those joints are can start the inspection there rather than on the open field of the roof.
What should I note before the visit?
Write down which floor shows the stain, the date it first appeared and whether it follows a heavy rain or a windy day. Those three notes narrow the search faster than a general description of the leak.
Keep the attic hatch clear and do not walk the roof if the surface is wet or steep. Ask the construction office in Newark about any permit before work starts, since the permit rule was not sourced for this page.