A wet skylight is often not a leaking skylight. Separating a genuine seal failure from condensation and from a curb flashing problem decides what actually needs doing.
The useful first question is when the water appears rather than where. Condensation peaks on cold, still, dry nights; a curb flashing fault tracks rain and wind direction; a failed glazing unit ignores both and simply gets worse. Establishing which pattern fits takes a few days of observation and costs nothing.
Two of the three causes need no roof work at all. Ruling them out first is what prevents an unnecessary repair to a skylight that was never leaking.
A wet skylight is one of the few roof complaints where the most likely answer needs no roof work at all. Ruling the other two out first is what stops an unnecessary repair.
A skylight is the coldest surface in a warm, humid room. Water forming on the inside of the glass and running down the reveal appears in cold weather, is worst in kitchens and bathrooms, and stops when the room is ventilated. No roof work will change it.
The unit itself has failed — misting between panes, water at the glazing bar. This is a window fault rather than a roof fault, and it is solved by the unit, not by the roof around it.
The skylight sits on a raised curb, and that curb is flashed into the roof like a small chimney: apron at the bottom, steps up the sides, head flashing at the top. Water entering here appears at the corners of the reveal and is worst in driven rain from one particular direction.
Condensation is worst on cold still nights with no rain at all. A curb flashing leak tracks rainfall and wind direction. A failed unit leaks regardless of both. Establishing which pattern fits takes observation, not a ladder.
On two- and three-family houses a skylight frequently lights a shared stair, which means the person who notices the water is not necessarily the person responsible for the roof above it.
Reference point: the city that forms Passaic's only land border, wrapping it to the north, south and west.
Because Clifton developed section by section rather than all at once, the right question is which part of the city a roof is in. A Botany Village roof and a Montclair Heights roof are different ages, different shapes and fail in different places.
Clifton is the one municipality reachable from Passaic without crossing water, which matters for how fast anyone can actually get to an active leak.
Far larger and markedly less dense than Passaic, and built out in distinct named sections -- Allwood, Athenia, Botany Village, Delawanna, Lakeview, Montclair Heights, Richfield and others -- each developed at a different time, so the housing stock varies sharply from one to the next.
All areas coveredUseful to know before accepting any quote, because a scope that ignores these is a scope that will have to change later.
New Jersey adopts a single Uniform Construction Code and municipalities may not set lesser or greater technical requirements. A repair specified correctly in Passaic is specified correctly in Clifton.
Replacing more than a quarter of a roof surface within any twelve-month period triggers a full construction permit. Splitting one job into two smaller ones inside that window does not avoid it.
Northern New Jersey sits in the design zone where an ice barrier is required, running from the eave edge to at least twenty-four inches inside the interior wall line. On older roofs it is frequently absent, which shows up as recurring winter leaks at the eaves.
In Passaic the Uniform Construction Code is enforced by the city's Division of Code Enforcement, which is where permits for qualifying roof work are issued.
The same job in the areas next door, and the other leak types we handle in this one.
Answers are general guidance about how these roofs behave, not a survey of any particular building.
Probably not. Condensation forms on the coldest surface in a warm humid room, which a skylight usually is. It is worst on cold still nights and improves with ventilation. A genuine leak tracks rainfall and wind direction instead.
Buildings sit close enough that the work usually happens from the gap between them or over a side gate. Whether that gap is clear, and who controls it, often decides how quickly the roof can be examined.
Only if more than a quarter of the roof surface is replaced within a twelve-month period — that is the threshold under the New Jersey Uniform Construction Code. Most targeted leak repairs sit well under it, but the scope decides, not the label on the job.
Describe what you are seeing and when it started — that is usually enough to narrow the cause before anyone climbs anything.