Flat Roof Replacement in Irvington

01 Irvington

Fix the fall, then lay the membrane.

Re-covering a flat roof without correcting the fall reproduces the failure on a new membrane. If water stood on the old system it will stand on the new one, in the same places, and the seams under it will be tested continuously rather than occasionally.

Irvington

Flat Roof Replacement, and what it actually involves

On a low-slope roof the specification argument is usually about the membrane, and the thing that decides the outcome is usually the drainage.

Stripped to the deck, not re-covered over the old roof
Deck inspected once exposed, with a stated allowance
Scoped against the NJ Uniform Construction Code
Newark and the surrounding Essex, Hudson and Union towns

(973) 788-8324

Two workers on a low-slope roof behind a parapet — Replacement work

01 Low-slope systems

Replace the fall, not just the membrane

A flat roof that ponded before will pond again under a new membrane, in the same places, unless something about the drainage changes.

Ponding is a design fault, not weather

Water still standing forty-eight hours after rain means the fall, the drains or the deck have moved. A new membrane laid over that is being tested continuously instead of occasionally.

Drains sized and sited first

A blocked or undersized outlet turns the roof into a shallow tank. Replacement is the only realistic opportunity to correct outlet positions, so it should be taken.

Tapered insulation earns its cost

Where the structural deck cannot be re-pitched, tapered insulation builds the fall into the build-up. It is the difference between a roof that drains and one that merely has a membrane.

Every penetration is its own detail

Pipes, vents, mechanical curbs and fixings each get flashed individually. On a large roof these outnumber every other failure point put together.

Wet insulation does not dry

Saturated boards under an old membrane stay saturated once a new one is over them. If the survey shows wet insulation it comes out, or the new roof is compromised on day one.

Terminations and upstands

The membrane turning up a wall, and the bar that holds it there, take the stress. The field of the membrane rarely fails first.

02 Applied to Irvington

What changes about this job here

Low-slope roofs on attached buildings drain to their own outlets behind a parapet, often internally. Replacement is the one realistic chance to correct an outlet that has always been undersized.

Irvington — attached and multi-family fabric

Nearly twenty-one thousand people to the square mile on under three square miles -- a stock dominated by closely set two- and three-family housing.

Reference point: the township on Newark's south-western border, and one of the most densely populated municipalities in the state.

03 On the ground in Irvington

What gets replaced here, and what makes it awkward

Where the difficulty sits

At this density the roofs are effectively continuous and every replacement terminates against a neighbouring building. The edge detail against the adjoining roof matters more than anything in the middle.

Worth knowing locally

Access and staging are the constraint. There is rarely off-street space for a skip, so tear-off has to be sequenced rather than done in one go.

61,176: Residents
2.91: Square miles
20,993: Per square mile
23,196: Housing units

An old roof covering being stripped back to the deck — Irvington

Buildings in Irvington

What the roofs are like in Irvington

Nearly twenty-one thousand people to the square mile on under three square miles -- a stock dominated by closely set two- and three-family housing.

All areas covered

05 Local conditions

What this climate does to a new roof

Newark sits in a humid subtropical shading into humid continental (Koppen Cfa/Dfa) zone with a full freeze-thaw winter — the combination hardest on flashings, fixings and mortar.

Freeze-thaw finds every gap

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

Meltwater behaves unlike rain

Melt moves slowly under a snow layer and refreezes at the cold eave, backing water up under the covering where pitch does not help. That is what the ice barrier exists for.

Driven rain arrives at an angle

Rain coming in sideways gets under laps that shed vertical rain perfectly well, which is why edge and flashing detail matters more than the covering specification.

Nearby & related

Flat Roof work close to Irvington

The same job in the areas next door, and the other work we take on in this one.

Flat Roof Vailsburg Flat Roof Weequahic Flat Roof Maplewood Flat Roof Hillside

Replacement in Irvington Installation in Irvington Shingle in Irvington Storm Damage in Irvington Multi-Family in Irvington

See every area we do flat roof replacement in across Newark →

Questions

Common questions

General guidance about how these buildings are re-roofed, not a survey of any particular property.

Can the flat roof just be re-covered?

Only if the water drains. A membrane laid over a fall that already ponds will pond in the same places, and the seams under standing water are tested continuously rather than occasionally. Correcting the fall is usually the actual job.

What happens where the roof meets the building next door?

It gets terminated and flashed as a detail in its own right. On attached buildings that junction is the single most likely place for a new roof to leak, and a failure there shows up in the neighbouring property rather than your own.

Will this need a permit?

Replacing more than a quarter of a roof surface within any twelve months requires a construction permit under the New Jersey Uniform Construction Code. A full replacement is over that threshold, so yes — and the work is inspected at stages.