IronSky · NYC Roofing & Waterproofing

Flat Roof Repair in New York City

Specialized flat roof repair for TPO, EPDM, modified bitumen and built-up roofs. We trace ponding, splits and seam failures and seal them for the long term.

(929) 994-0907 Get a Free Estimate

What's Included

Every flat roof repair project starts with a free, no-pressure inspection and an itemized written estimate. Here's what you can expect from our crews:

✓Seam, blister & puncture repair
✓Ponding water solutions
✓Drain & scupper repair
✓Membrane patching & re-flashing

Why IronSky for Flat Roof Repair?

Licensed & Fully Insured

NY-licensed contractors, full general liability and workers' comp.

Free, Honest Estimates

Itemized written quotes with photos. No hidden fees.

Manufacturer Warranties

GAF, Owens Corning, CertainTeed, Firestone and Elevate certified.

24/7 Emergency Response

Round-the-clock crews for urgent leaks and storm damage.

What Is Flat Roof Repair?

Flat roof repair is the targeted fix of single-ply or multi-ply membrane systems — TPO, EPDM (rubber) and modified bitumen — without replacing the entire roof. NYC has more flat roofs than any other city in the country; almost every Brooklyn rowhouse, Queens 2-family, Bronx walk-up and Manhattan setback has one. The right repair method depends entirely on which membrane is up there. TPO is heat-welded with a hot-air gun and patched with matching membrane. EPDM is patched with cured or uncured rubber, splice tape and primer. Modified bitumen is torch-applied, mopped, or self-adhered. Mixing methods or using the wrong patch material is the #1 reason flat-roof repairs fail within a year.

Signs You Need Flat Roof Repair

✓Standing water (ponding) more than 48 hours after rain
✓Blisters, bubbles or wrinkles in the membrane
✓Open seams or lifting laps between membrane sheets
✓Cracking, splitting or alligatoring on modified bitumen
✓Punctures from foot traffic, fallen branches or HVAC work
✓Failed flashing at parapets, drains, vents and curbs
✓Clogged or undersized roof drains causing backup
✓Active interior leaks below the flat-roof area

Our Flat Roof Repair Process

STEP 1
Membrane ID & Diagnosis
We identify the existing membrane (TPO, EPDM, mod-bit or BUR) and map every defect, ponding area and failed seam.
STEP 2
Compatible Repair Plan
We spec patches and seam work using materials chemically and mechanically compatible with what's already on your roof.
STEP 3
Drainage & Ponding Fixes
We re-pitch low spots with tapered insulation, install new drains or apply liquid-applied membranes to eliminate standing water.
STEP 4
Heat-Welded / Torch / Splice Repairs
TPO is heat-welded, EPDM is spliced with primer and seam tape, mod-bit is torch- or hot-mopped — always to manufacturer spec.

Materials We Use

✓GAF EverGuard TPO and Firestone UltraPly TPO membrane and accessories
✓Carlisle and Firestone EPDM, splice tape, primer and uncured flashing
✓SBS and APP modified bitumen (Siplast, Soprema, GAF Ruberoid)
✓Henry, Karnak and Tremco liquid-applied flashing and membrane systems
✓Tapered polyiso insulation, cast-iron drains and lead-flashing for penetrations

How Long It Takes

Most flat-roof repairs are finished in 1 day. Multi-area seam rebuilds, drain re-installs or ponding-fix work with tapered insulation can take 2–4 days. Emergency leak stops and tarping are typically same-day.

Warranty

IronSky workmanship warranties on flat-roof repairs run 2–10 years depending on the system and scope. Patches and seam welds done with manufacturer materials inherit the underlying system warranty (GAF, Firestone, Carlisle, Siplast) when applied to manufacturer spec — we provide the documentation.

Before & After

Real Results From Our NYC Jobs

Side-by-side photos from recent IronSky projects across the five boroughs.

before flat roof repair with ponding water in Brooklyn — IronSky Roofing — Before: damaged flat roof with ponding water · After: new TPO membrane installed, Brooklyn NY

after flat roof repair with new TPO membrane in Brooklyn — IronSky Roofing — Before: damaged flat roof with ponding water · After: new TPO membrane installed, Brooklyn NY

before flat roof repair with seam failures in the Bronx — IronSky Roofing — Before: failed seams and blistered membrane · After: re-welded seams and new walk pads, Bronx NY

after flat roof repair with re-welded seams in the Bronx — IronSky Roofing — Before: failed seams and blistered membrane · After: re-welded seams and new walk pads, Bronx NY

Flat Roof Repair — Service Areas

We provide flat roof repair across every NYC neighborhood. Pick your area for local details.

Manhattan

Brooklyn

Bronx

Staten Island

Long Island

Yonkers

Flat Roof Repair in Yonkers

Flat Roof Repair — Frequently Asked Questions

How much does flat roof repair cost in NYC?+

Most flat-roof repairs in NYC range from $450–$2,000 depending on membrane type, size of the damaged area, and accessibility. IronSky provides free written estimates with no hidden fees.

How long will a flat roof repair last?+

A properly executed seam, flashing, or membrane patch typically lasts 5–10+ years when done with the correct compatible material (TPO, EPDM, or modified bitumen).

Can you fix ponding water on a flat roof?+

Yes. We re-pitch low spots, install tapered insulation, or apply liquid-applied coatings to eliminate ponding and prevent future leaks.

Do you work on TPO, EPDM, and modified bitumen?+

Yes — IronSky crews are trained and certified on all major flat-roof systems including TPO, EPDM, modified bitumen, and built-up roofing.