Licensed & insured · Queens, NY

Replace Flashing on Roof

Replace flashing on roof joints is what MNM Roofing does when rust streaks, a chimney gap, or a repeat leak points to failed metal. We pull the corroded flashing at the chimney, valley, step, or vent pipe and set a new watertight seal, usually the same day. Water coming in right now needs our emergency roof repair services page instead. Otherwise, call (347) 835-5040 or request a free estimate below.

MNM Roofing roofer fitting new step and counter flashing around a brick chimney on a Queens roof
Why flashing gets replaced

The metal doing the real work at every joint

Flashing seals the joints where your roof meets a chimney, wall, valley, or vent pipe. Shingles can look fine and a roof will still leak if the flashing at one of those points has rusted through or lost its sealant.

Replacing it stops water intrusion at that exact leak point and keeps rot from spreading into the deck below. A small gap at a vent boot left alone turns into a soaked deck and a ceiling stain two rooms away. A leaking bitumen membrane can show the same symptoms, worth a look if your roof is flat.

  • Stops water at the leak point
  • Restores a watertight seal
  • Keeps rot out of the deck
Close-up of rusted, gapped flashing where a shingle roof meets a brick chimney

4

Joint types we reseal

The ways we replace it

Four joints, four different fixes

The type of joint decides the method.

Each gets matched to the joint it protects, not covered over with more sealant.

Flashing type How we fix it
Chimney flashing Step and counter flashing layered and re-sealed against the brick
Valley flashing Metal channel pulled and replaced where two slopes meet
Step flashing Individual pieces re-set along the wall line
Drip edge and vent boots Rusted metal or cracked rubber swapped at the edge and pipe
From the leak point to a sealed fix

One visit, traced to where the water gets in

We work from the specific spot causing trouble, chimney, valley, vent, or wall line. Four steps get you there.

  • Chimney
  • Valley
  • Vent
  • Wall line
Trace 01

Find the exact leak point

We find the exact leak point first, not just the general area.

Remove 02

Pull the failed metal

The rusted or failed metal comes off next.

Replace 03

Set matched new flashing

New metal or a matched rubber boot goes in after, sized to that spot.

Test 04

Water-test the seal

We run water over the repair before we leave, while we are still on the roof.

A full roof inspection checks every flashing point, not just the one giving you trouble, if you want the whole system looked at while we are up there.

What rushes the job vs what we guarantee

A bead of sealant is not a repair

The cheap call-back

A patch over sealant

  • Caulk goes over the rusted metal and looks fixed for a season.
  • Then it cracks, and the same leak point opens back up.
  • Usually in the next hard rain.
What we guarantee

Our full swap

  • A full metal or rubber swap, matched to the joint.
  • Backed by our warranty.
  • It costs more than a patch. It does not call you back next winter.
Every property we cover

Licensed, insured, and on every roof type in Queens

We replace flashing on every kind of building, from one house to a commercial roof.

Every job is licensed and insured, from a single chimney flashing repair to a full roof-to-wall run on a commercial building.

Licensed & insured on every job
  • Residential single-family homes
  • Multi-family and condominium buildings
  • Apartment buildings
  • Commercial low-slope and pitched roofs
FAQ

Flashing replacement questions, answered

Flashing problems show up as leaks near a chimney, wall, valley, or vent pipe rather than the open field of the roof. Rust streaks or missing sealant at one of those joints usually points to flashing. We confirm it on site before quoting anything.

A single-point job, a chimney or vent boot, finishes in a day. A larger job covering multiple valleys takes longer, and we give a real timeframe at the estimate.

No. It stands on its own unless the inspection turns up separate problems nearby.

Yes. Every flashing replacement carries our workmanship warranty, and we tell you exactly what it covers before work starts.

Free estimate

Get your flashing looked at, free

Rust at the chimney or a gap around a vent will not seal itself. Call (347) 835-5040 or reach us directly to schedule a free estimate, usually the same day.

Same-day response across Queens

MNM Roofing crew sealing new vent pipe flashing on a Queens rooftop
Licensed & insured Same-day response Free estimate