Carlisle, Firestone, GAF, Versico EPDM rubber membrane. GAF EverGuard TPO. CertainTeed Flintlastic and Siplast Paradiene modified bitumen. Polyiso insulation board. Lead-coated copper and TPO-coated metal flashing.
EPDM vs TPO vs modified bitumen — which is best for NYC?
EPDM is the most reliable for NYC — 25+ year track record, handles freeze-thaw best, easiest to repair. TPO is the newer option with white reflective surface that lowers AC costs (good for NYC CoolRoofs program eligibility). Modified bitumen is good for budget recover-overs of existing tar & gravel. We recommend the right system based on your specific roof — no one-size-fits-all.
Do I need to tear off the old roof?
Not always. NYC code allows up to two roof layers. If your existing roof is structurally sound and dry below, we can often "recover" over it with new insulation and a new membrane — saving 30–40% on cost. We always inspect the deck and existing insulation moisture content before recommending recover vs tear-off.
How much does a flat roof cost in NYC?
Flat roof replacement in NYC: EPDM $7–$10/sq ft, TPO $8–$12/sq ft, Modified Bitumen $7–$11/sq ft, Built-up tar & gravel $9–$14/sq ft. A typical 1,200 sq ft Brooklyn brownstone flat roof runs $9,000–$14,000.
How long does a flat roof last?
EPDM: 25+ years. TPO: 20–25 years. Modified bitumen: 15–20 years. Old tar & gravel: typically 15–20 years. Lifespan depends heavily on installation quality, ventilation underneath, foot traffic, and how aggressively you maintain it.
Why does my flat roof have ponding water?
Ponding usually means inadequate slope, clogged drains, or sagging insulation. Water sitting on a flat roof for more than 48 hours is a code violation under most warranty terms. We fix ponding by adding tapered insulation, new crickets, additional drains/scuppers, or membrane build-up at the low spot.
Can you install a roof deck on top of my flat roof?
Yes — pedestal pavers or sleeper systems over a properly designed waterproofing membrane. We coordinate with deck builders and architects. NYC requires DOB permits for any rooftop occupied space over a certain size.
Do you install green roofs?
Yes — extensive (sedum) and intensive (full garden) green roof systems. NYC offers a green roof tax abatement under Local Law 94 that can offset a significant portion of the installation cost.
How do I extend the life of my flat roof?
Annual inspection, semiannual gutter & drain cleaning, prompt repair of any small punctures or seam issues, recoating with white reflective coating every 7–10 years, and keeping foot traffic minimal. A well-maintained EPDM roof can last 30+ years.
