How long a roof actually lasts in north Jersey
The number on the wrapper was earned in a laboratory over a ventilated attic in a moderate climate. A north Jersey house frequently offers none of the three. What is useful is knowing which clock each part of your roof is on — and on most houses here there is more than one.
The clocks on one house
Asphalt shingle: rated twenty-five or thirty years, realistically closer to twenty here, and less over a finished attic or where the covering never sealed properly because it went on late in the season. A second layer runs shorter than a first, because it sits on asphalt rather than wood and holds its heat. Flashings and their sealant: shorter still, and they are what freeze-thaw cycling attacks first. Low-slope or flat sections over entries, garages and row-house roofs: a membrane runs fifteen to twenty years on its own schedule.
And a clock nobody counts: the roof edge. Fascia, soffit and the gutter hardware fail on their own timeline, driven by autumn debris and winter cycling rather than by sun, and they routinely need attention while the field of the roof still has years left.
Reading your own
From the ground: look along the roof edge at a gable end for the step that means two layers. Look for shingle edges that are lifted rather than lying flat, which means they are no longer sealed. Check the gutters for granules after heavy rain. Look at the fascia for soft, dark or wavy sections. And look at the north slope against the south — the difference tells you how the sun and shade have divided the work.
Inside, the attic tells more than the roof does. Daylight at penetrations, staining on the underside of the deck, insulation packed against the soffit where the intake should be, and rusted nail points — that last one is condensation, which means a ventilation problem rather than a leak. On a finished Cape you cannot see any of it, which is exactly why an inspection earns its price on that kind of house.
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