Flat Roofing in Nassau County
County Roofing Systems
Flat Roofing Services for Nassau County
SERVING LONG ISLAND AND NY FOR 35 YEARS
Nassau's Flat Roofing Experts
Flat roofing has a longer history on Long Island than most homeowners realize.
Walk through the South Shore communities of Long Beach, Atlantic Beach, or Oceanside and you’ll find dozens of midcentury modern homes with low-slope roofs that have been a defining architectural feature since they were built.
In Nassau County, flat and low-slope systems also appear on home additions, garage rooftops, dormers, and rear extensions — situations where a pitched shingle roof isn’t structurally or aesthetically appropriate. These systems perform well when they’re correctly installed and properly maintained. When they’re not, a low-slope roof becomes the fastest route to interior water damage.
County Roofing Systems has been installing, repairing, and replacing residential flat roofs in Nassau County for over 35 years. We work with every modern low-slope system — EPDM, TPO, and modified bitumen — and we bring the same licensed-and-insured professionalism to flat roofing that we bring to every other project.
For full details on our flat roofing approach, visit our Flat Roofing page.
Professional Flat Roofing Services in Nassau County
Low-slope roofing requires a fundamentally different approach than shingle installation. Drainage design, membrane selection, seam integrity, and flashing execution matter more on a flat roof than almost anywhere else in residential construction — because gravity isn’t doing the work of shedding water.
A small error at a seam or penetration doesn’t become a problem eventually; it becomes a problem the first time it rains.
We are fully licensed and insured, and we handle Nassau County Building Department permit requirements across the Town of Hempstead, North Hempstead, and Oyster Bay. Every flat roof installation we complete is designed for Nassau County’s specific climate exposure: nor’easter wind loading, freeze-thaw cycling through winter, and the salt air conditions that accelerate membrane and flashing deterioration in South Shore communities.
We install flat and low-slope roofing systems on Nassau County properties including:
- Full flat roof replacements on midcentury modern homes along Nassau County’s South Shore
- Flat roof extensions, additions, and garage rooftops throughout Hempstead, Mineola, and surrounding areas
- Low-slope sections on complex rooflines where shingle systems aren’t appropriate
- Dormer and portico roofs requiring membrane waterproofing
- Properties in barrier beach communities including Long Beach and Atlantic Beach where coastal exposure demands careful system selection
Our Flat Roofing Services
We handle every aspect of flat roofing on Nassau County properties.
A BEAUTIFUL NEW ROOF
EPDM Roofing (Rubber Membrane)
EPDM — ethylene propylene diene monomer — is a synthetic rubber membrane that has been the standard for low-slope residential roofing for decades. It comes in large sheets that minimize seams, reducing potential leak points. The material’s natural flexibility allows it to expand and contract with Nassau County’s temperature swings without cracking or splitting — a meaningful advantage through Long Island winters. Properly maintained, EPDM systems last 20–30 years.
FAST ROOF INSPECTIONS
TPO Roofing Membrane
TPO (thermoplastic polyolefin) is a heat-welded single-ply membrane that creates watertight seam bonds stronger than adhesive-based systems. It offers excellent UV reflectivity — a genuine benefit for Nassau County rooftop decks and sun-exposed flat surfaces — along with resistance to mold, punctures, and tears. TPO is increasingly the first recommendation for Nassau County homeowners adding rooftop deck functionality or prioritizing energy efficiency.
PROTECT YOUR HOME
Modified Bitumen Roofing
Modified bitumen is a multi-layer asphalt membrane reinforced with polymerized rubber or plastic and fiberglass, descended from built-up roofing systems that have waterproofed flat roofs for over a century. Mod bit provides excellent resistance to foot traffic — useful on Nassau County properties where flat roofs function as accessible terraces or where HVAC equipment requires regular service access. Average lifespan runs approximately 20 years depending on installation quality and maintenance.
EXPAND YOUR HOME
Flat Roof Repair
Not every flat roof issue warrants a full replacement. We assess membrane condition, seam integrity, and drainage function honestly before recommending a scope of work. Where repair is appropriate — membrane patching, seam resealing, flashing replacement — we complete it properly and document what was done.
FINANCE YOUR MELVILLE HOME IMPROVEMENT PROJECT TODAY
0% Financing, Quick & Easy Approval for Melville Homeowners
With nearly four decades serving Melville homeowners under our belt, we know what’s needed to make your roofing project a success.
After completing your roof inspection, if repairs or updates are recommended, we’ll do everything we can to make affording your roof repair or replacement quick and easy.
When you work with County Roofing, you get only the best. As little as 0% interest on approval for 5 years, quick approval, easy pay, and all backed by the best guarantees in the industry.
Signs Your Nassau County Flat Roof Needs Attention
- Ponding water remaining on the roof surface 48 hours after rain: indicates drainage slope issues or blocked drains
- Blistering or bubbling on the membrane surface: trapped moisture or air beneath the membrane
- Visible cracks, tears, or surface erosion at seams or around penetrations
- Interior ceiling stains, mold, or musty odors indicating active moisture infiltration through the roofing system
- Flashing separation at parapet walls, chimney bases, skylights, or mechanical penetrations
- Membrane shrinkage pulling away from edges or corners
- Age beyond 20–25 years for EPDM or modified bitumen systems: particularly relevant for Nassau County’s inventory of 1950s and 1960s homes with original flat roof sections
- Soft or spongy feel underfoot during roof access: a sign of compromised deck or saturated insulation below
Long Island Deserves Industry-Leading Protection
Lifetime Material, Lifetime Workmanship Warranty
CertainTeed’s lifetime-limited transferable warranty is a true industry standout. Whereas other manufacturers only warrant against defects that cause leaks, CertainTeed protects your Melville home against all manufacturing defects, including aesthetic defects.
County Roofing Systems can offer you the longest warranties available because we’re a CertainTeed SELECT ShingleMaster, a certification only 1% of contractors qualify for.
To learn more about the industry-leading LIFETIME material, LIFETIME workmanship warranty, click the button below to call us today:
How Our Flat Roof Installation Process Works
- Assessment and system selection — We evaluate existing conditions, drainage layout, access requirements, and the homeowner’s objectives (functional roof only vs. accessible deck) before recommending an EPDM, TPO, or modified bitumen system
- Deck preparation — All old roofing stripped to bare substrate; damaged or moisture-compromised plywood replaced; deck confirmed structurally sound and properly sloped for drainage before any membrane goes down
- Insulation installation — Rigid foam insulation boards installed to improve thermal performance and confirm proper drainage pitch across the entire field; critical for Nassau County’s freeze-thaw cycle prevention and energy efficiency
- Drain and scupper positioning — All existing drains and scuppers inspected and cleared; drainage routes confirmed functional before membrane installation begins
- Membrane installation — EPDM installed in large sheets minimizing seam count; TPO heat-welded at all seams for watertight bonds; mod bit torch-applied or self-adhered per manufacturer specification and site conditions
- Penetration and perimeter flashing — All skylights, vent pipes, HVAC curbs, and roof edges flashed and sealed; parapet wall flashing and counter-flashing completed; every penetration waterproofed before the job is considered done
- Final inspection and drainage test — Full membrane walkthrough checking seam integrity, flashing terminations, and surface condition; drainage confirmed functioning properly before we leave the site
County Roofing Service Reviews
Check out our verified Google 5 star reviews below, from homeowners we’ve served throughout Long Island:
County Roofing replaced my aging roof and all of the gutters. Keith was truly professional, performing the estimate, supervising the work, and keeping me informed at every step. The results were beautiful. I would not hesitate to recommend County Roofing Systems to anyone.
Our roof was a bit of a tricky project, but Keith’s crew handled every nuance flawlessly—right down to protecting the gutters and surrounding landscaping. The workmanship is top-tier; you can see and feel the quality in every shingle. Equally impressive, Keith was completely transparent about costs and timelines, and his quote was the most competitive we received by a mile.
I had County Roofing Systems install new vinyl siding and gutters and leaders. Keith was very professional as well as personable and really knew his craft. Keith was on site the entire time with his crew. The house came out perfect. Just want to say thanks to Keith and I would give 5 stars plus! Thanks again Keith for all your good work.
Had a fantastic experience with County Roofing! Keith was extremely thorough. He walked through every detail, explained all the color options, and offered thoughtful recommendations that made a big difference. His crew did an outstanding job, and our new roof looks absolutely amazing.
Highly recommend County Roofing to anyone looking for a reliable, skilled roofing team!
Recently had a new roof done by County Roofing, and am so thankful for having met Keith. He is fair with the price, knowledgeable about his work, patient, responsive and professional. It really was a pleasure, and I will definitely be recommending Keith and his crew to anyone I know looking to do roof work.
*Images above are real customer photos provided by customers or taken by the County Roofing team upon work completion.
Why Choose County Roofing Systems in Nassau County
- 35+ years of flat roofing experience across Nassau County: We’ve installed and replaced flat roofs on midcentury modern homes, South Shore beachfront properties, and Nassau County additions of every type
- Material-neutral recommendations: We recommend the system that fits the property, the climate exposure, and the homeowner’s goals not the product with the highest margin
- Nassau County permit handling: We manage all filings with the Town of Hempstead, North Hempstead, and Oyster Bay building departments on every project
- No subcontractors: Every installer is a County Roofing employee. Flat roofing tolerates no installation errors, and our team handles every job directly
- Honest layover vs. replacement guidance: We tell you which approach is actually appropriate for your roof’s condition, and we show you why
Roofing Materials We Work With
For flat and low-slope systems, we work with:
- EPDM rubber membrane: Firestone RubberGard; large-format sheets minimizing seam count; 20–30 year service life
- TPO membrane: Heat-welded single-ply; UV reflective; excellent mold and puncture resistance; well suited to rooftop deck applications and Nassau County sun exposure
- Modified bitumen: Multi-layer reinforced asphalt membrane; excellent foot traffic resistance; suitable for roofs requiring regular maintenance access; 20-year average service life
- Rigid foam insulation: Installed beneath the membrane for thermal performance and proper drainage slope
For shingle systems on pitched sections of the same project, we use GAF and Owens Corning products as applicable.
OVER 35 YEARS IN THE ROOFING INDUSTRY
Call Now for Flat Roofing in Nassau County
Need a flat roof evaluation, repair, or full replacement in Nassau County? County Roofing Systems is ready to help.
Call (631) 400-ROOF or fill out the form below to schedule your free estimate.
Areas We Serve in Nassau County
We provide flat roofing services throughout Nassau County, including:
- Massapequa
- Massapequa Park
- Wantagh
- Seaford
- Merrick
- Bellmore
- Oceanside
- Long Beach
- Atlantic Beach
- Lawrence
- Cedarhurst
- Woodmere
- Old Westbury
- West Hempstead
Flat Roofing FAQs
What's the best flat roof material for Nassau County?
It depends on the property. EPDM is our most commonly installed residential flat roof membrane — durable, flexible, and well-suited to Long Island’s temperature range. TPO is the better choice when UV reflectivity is a priority or when the homeowner is creating a rooftop deck. Modified bitumen works well on roofs that see frequent foot traffic or require a layered, multi-ply waterproofing approach.
How long does a flat roof last?
EPDM and TPO systems typically last 20–30 years with proper maintenance. Modified bitumen averages around 20 years. Annual or biannual inspection — particularly after winter — significantly extends service life by catching seam and flashing issues before they become interior leaks.
Can a flat roof be converted to a rooftop deck?
Yes, and it’s something we handle regularly in Nassau County’s South Shore communities. TPO membrane is typically the best substrate for a deck application. We coordinate with the deck installer to ensure all penetrations, drains, and edges are properly waterproofed before any framing or decking goes down.
Do you handle Nassau County permits for flat roofing?
Yes. Flat roof replacement permits are required across Nassau County’s three towns. We manage all filings — Town of Hempstead, North Hempstead, and Oyster Bay — before any work begins.
My flat roof has multiple leaks but isn't that old. Do I need a full replacement?
Not necessarily. Multiple leak points sometimes indicate a seam failure or a drainage problem that can be corrected without full replacement, especially if the membrane is under 15 years old and the deck beneath is sound. We assess the full picture before recommending a scope of work.