Skylight Leak Repair in North Arlington

Three different faults, three different repairs.

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.

North Arlington

Skylight Leak Repair, and what it actually involves

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.

The entry point is traced before anything is sealed
Pitched, flat and mixed roofs on pre-war stock
Scoped against the NJ Uniform Construction Code
Passaic and the surrounding river towns

(973) 381-5662

Daylight entering a loft through a rooflight, with the rafters visible

Leaksonly

Before assuming the roof

Two of the three causes are not roof problems

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.

Condensation, which is not a leak

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.

Seal failure at the glazing unit

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.

Curb flashing, which is a roof fault

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.

The age test that separates them

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.

Applied to North Arlington

What changes about this job here

Skylights here are usually in habitable rooms with better ventilation, which makes a genuine curb-flashing fault more likely than condensation.

North Arlington — mixed density

Reference point: the borough on the ridge above the Passaic River south of Lyndhurst.

On the ground in North Arlington

What the buildings here are, and where they let water in

Where it typically fails

Sloping sites put houses at different heights relative to one another, and a roof that drains toward a neighbouring property at a lower level concentrates water where neither owner is watching for it.

Worth knowing locally

On a slope the gutter run matters more than usual, because the fall is rarely as even as it looks from the street.

Local conditions

What this climate does to a roof

Passaic sits in a humid subtropical (Koppen Cfa) zone with a full freeze-thaw winter — the combination that is hardest on flashing and mortar.

Wind-driven rain finds laps

Rain arriving at an angle gets under flashing laps that shed vertical rain without difficulty. This is why a roof can be watertight for years and then leak in one particular storm from one particular direction.

Freeze-thaw opens what was already tired

Water that gets into a mortar joint, a lap or a hairline crack and then freezes expands. Northern New Jersey cycles through that repeatedly each winter, which is why small defects here do not stay small.

Snowmelt behaves unlike rain

Meltwater moves slowly under a snow layer and refreezes at the cold eave. That backs water up under the covering, where no amount of pitch helps, and it is the reason eave leaks appear in thaws rather than storms.

Questions

Common questions

Answers are general guidance about how these roofs behave, not a survey of any particular building.

My skylight is wet but it has not rained. Is it leaking?

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.

What is different about working on roofs in North Arlington?

Most properties here can be reached from their own ground, which makes inspection straightforward and generally means a smaller, better targeted repair than the same fault would need in the dense river boroughs.

Will this need a permit?

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.