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Garages, porches and rear additions with a low-slope top

Flat Roof Repair in Lyndhurst, NJ

Flat roof repair in Lyndhurst, NJ is mostly about the low-slope tops over garages, porches and rear additions. Typical trouble: a puddle that outlasts the rain, a seam that lifts at the edge, a ceiling stain under a roof nobody sees from the street. Call (551) 209-3947 and say what sits underneath, and a local roofer can arrange a visit to inspect the membrane, its seams and the drain.

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Flat black membrane roof over a brick and siding garage

Looks from the ground

Each of these looks is made from the ground or at a window. A ladder, a wet slope or a steep pitch belongs to the roofer.

  • From an upstairs window or the yard, photograph the flat section the morning after a rain and again two days later. A puddle that is still there on day two is worth a call.
  • Look at the edge of the roof from the ground for metal that has bent away, or a lip of surface that curls up.
  • Inside the garage or porch, hold a flashlight low across the ceiling. Stains and sags show up in raking light.
  • Note whether the drain, if you can see it, is clear. A leaf pile there is the first thing a roofer will mention.

Leave it and make the safety call if

  • A wire sags or lies on the ground by the building: keep well clear, and call 911 and PSE&G, the gas and electric utility, on 1-800-436-7734.
  • The ceiling below the flat roof bows with water: keep people and cars out of the spot underneath, and if it looks ready to drop, call 911 from a safe distance.
  • Water reaches a light or an outlet in the garage or addition: leave the space, and call 911 at any spark or burning smell.
  • Snow or ice covers the roof: do not walk out to sweep or chip it. Ice hides the drain and the edge, and 911 is for a fall that has already happened.

A puddle on the roof, scored one to ten

  1. 8 to 10

    the ceiling below sags with water, a light fixture is wet, or a wire is on the ground. Keep clear and use the safety lines above first. Then call (551) 209-3947 about the roof when everyone is clear of the area.

  2. 4 to 7

    a puddle that outlasts two days, a stain that grows, or a seam you can see lifting. Photograph the roof from a window and call (551) 209-3947 this week.

  3. 1 to 3

    water that is gone within a day of the rain and a dry ceiling underneath. Keep taking the photos, and call if the puddle lingers longer next time.

Three questions about this job

At what point does a roof puddle turn into a problem?
Roofers call it ponding once water sits for two days. The asphalt roofing trade group sets the mark at 48 hours or longer, recommends at least a quarter inch of slope per foot so water leaves freely, and notes that model codes call for positive drainage on a re-roof.
What does standing water do to a roof?
The same trade group lists several effects: the extra weight can flex the deck and deepen the pond; ice that forms and shifts can scour the membrane; algae and plants can damage the surface and clog drains; and moisture can reach the insulation, the deck and the rooms below.
Is a detached garage roof treated like a house roof?
The state's maintenance list speaks of detached one- and two-family dwellings, and a garage is a different kind of building. Lyndhurst's Construction Department can say how it treats a garage re-roof, so bring the address and a few words about the job to the call.

Signs this is the job

  • Water lingering on the roof for two days after a rain
  • A seam or edge where the rubber or tar surface has lifted
  • A garage or porch ceiling that stains in one corner
  • A drain or scupper packed with leaves, or with something growing in it
  • Dark patches or green film on the surface, seen from an upstairs window
Brown gutter with leaves along a gray roof edge

Mend the seam, or rethink the slope?

A lifted seam or a split at the edge is a local job: dry the spot, replace the damaged strip, seal the joint. A puddle in the same place after every rain is a different question, because the trade group ties lasting ponds to a flexing deck, ice that scrubs the surface, and drains that clog.

When the low spot is part of the deck itself, a roofer may talk about adding drainage or redoing that section, which edges toward roof replacement. A roof inspection is the way to find out which side of the line a given garage falls on.

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Checked 1 Nov 2026

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