Roofing Materials & Installation
TPO vs EPDM vs PVC Roofing: Which Flat Roof Material is Right for Your Suffolk County Property?
Choosing the right flat roofing material affects your property’s protection, energy costs, and maintenance needs
Excel Flat Roofing
Flat Roof Work That Keeps Your Building Open
We install, repair, and maintain flat and low-slope roofs across Suffolk County, on everything from offices and warehouses to homes and condos. TPO, EPDM, PVC, modified bitumen, single-ply rubber, torch down. Licensed, insured, and on the phone when a roof starts letting water in.
A Long Island Winter Is Hard on a Flat Roof
It comes down to two things: weight and water that has nowhere to go. Snow piles up on a low-slope roof and stays there, and a foot of wet snow adds real load to a deck that was sized for a lighter number. As it melts and refreezes, water backs up behind drains and scuppers already half-blocked with leaves, and that standing water works into the weak seams and the flashing around every curb and parapet.
By spring the result shows itself. Soft insulation underfoot, a stain spreading on the ceiling below, a membrane that has stretched and pulled away at the edges. A roof that drained properly and got cleared a couple of times through the season comes out fine. The one that held snow and water from December on is the one calling for work in March.
About Us
Built for the Roofs Over Working Buildings
Excel Flat Roofing has spent years on the low-slope roofs that cover the area’s schools, churches, plants, storefronts, and apartment buildings, along with plenty of houses carrying a flat addition out back. Flat and low-slope is the work we know cold: the membranes, the drainage, the flashing details, and the way each system fails when it starts to go.
Most of the buildings we work on cannot simply close for a week, and that shapes how we run a job. We sequence the work around your hours, keep any open deck closed up tight before we leave each evening, and stay out of the way of the people and the operations underneath us. A reroof on an occupied building is as much a scheduling job as a roofing one, and that is the part a lot of contractors get wrong.
We are licensed and insured, we pull the permits a job calls for, and we hold the manufacturer certifications that let us register full system warranties rather than a verbal promise. Everything is written down before it starts and walked with you when it ends, so you know exactly what went on the roof and what stands behind it.
Years of Experience
15
+
Roofs Installed
1
k+
Client Trust
98
%
Service Hours
Monday – Friday : 08:00 AM – 06:00 PM
Saturday : 09:00 AM – 03:00 PM
Sunday : Closed
Why Choose Us
Reasons Owners and Managers Stay With Us
A flat roof is a long relationship. Whoever you pick will be back for inspections, the occasional repair, and eventually the replacement, so the call is worth getting right the first time.
We work around your hours, not ours
A school reroofs over the summer and on weekends. A restaurant gets the loud, fume-heavy work done before the doors open. A warehouse keeps its dock clear while we stage on the far end. We plan the sequence around how your building actually runs.
Everything in writing
You get the work spelled out line by line before anything starts, and a new system comes with the manufacturer's membrane warranty plus our own workmanship coverage, both on paper.
One trade, taken all the way through
Flat and low-slope is all we install, so the crew on your roof has run your exact membrane many times over, and the foreman on site is the same person who walked the roof and wrote the scope.
Services
What We Handle on Flat and Low-Slope Roofs
From a single leak to a full tear-off and new system, every job we take lives on a flat or low-slope roof. The guides further down break each area out in more detail.
Service Areas
We cover the county end to end, from Babylon and Islip through Smithtown and Brookhaven and out toward Riverhead and the forks.
Services-Suffolk County
Repair, replacement, inspection, maintenance, waterproofing, and snow clearing, all under one licensed contractor instead of a different number for each task.
Residential
Rear additions, garage roofs, and flat-topped homes get the same membrane systems and detailing as the commercial work, sized for a smaller roof.
Commercial
Warehouses, plants, office buildings, retail plazas, and restaurants, where the job has to fit around tenants, freight, and business hours.
Installation & Construction
Flat roof systems on new builds and additions, spec'd to the structure, the load it carries, and the way the building will be used.
Replacement
Tear-off to a clean deck, new insulation and cover board, then a fresh TPO, PVC, EPDM, or modified bitumen system spec'd to the building.
Repair & Problems
Lifting seams, cracked flashing, failed pitch pockets, blistered membrane, backed-up drains. We find the real source before we open anything up.
Coatings & Waterproofing
On a sound, dry roof, a fluid-applied coating or waterproofing layer adds years and reflects summer heat for a fraction of a replacement.
Contractors & Services
We come in as the roofing piece on larger projects, coordinate with the general contractor or building manager, and keep our scope and paperwork clean.
Excel Flat Roofing
Not Sure What Your Roof Needs Yet?
Send us the address and a few photos, or have us come out and walk it. You will get a straight read on what is happening up there and what it would take to put right, with no charge for the look.
Our Team
The People on Your Roof
Our foremen have run flat-roof crews on Long Island for years, hold the manufacturer certifications that let us register full warranties, and stay current on the codes and safety rules that come with working over occupied buildings. The same faces show up from the first walk-through to the final inspection.
Roofing Guide
Flat Roofing, Explained Without the Sales Pitch
Plain answers to the questions owners and managers actually search, written by the people who spend their days on these roofs.
General Flat Roofing
What "flat" really means, why low-slope roofs behave nothing like pitched ones, and what that changes about how they get built and looked after.
General Info
The first questions answered: rough cost ranges, how long a job takes, which permits apply, and what to expect while the work is happening.
Structures & Extensions
How flat roofs sit on additions, dormers, and rear extensions, and how the structure underneath carries snow, foot traffic, and rooftop equipment.
Technical & Structural
Decking, substrate, slope, fasteners, and the structural movement a membrane has to ride out without splitting.
Materials & Systems
The main membrane families, TPO, PVC, EPDM, modified bitumen, and single-ply rubber, and how each one is actually put down.
Materials & Comparisons
The membranes head to head: which one holds up best for your building, your budget, and your exposure to sun and weather.
Skylights & Windows
Curbs, counter-flashing, and the details that keep a skylight from becoming the first place the roof leaks.
Ventilation & Insulation
Tapered insulation, R-value, condensation control, and venting that stops moisture from building up beneath the membrane.
Drainage & Slope
Drains, scuppers, tapered systems, and why getting water off the roof matters more than nearly anything else you can do for it.
Maintenance & Lifespan
What a flat roof needs each year, and what actually carries it to the top end of its rated life instead of the bottom.
Problems & Climate
Ponding, blistering, wind uplift, and snow load, and how the coastal weather off the South Shore drives each one.
Our Projects
Recent Work Around the County
A few of the flat roofs we have replaced, restored, and repaired for buildings that had to keep running while we did it.
Roof Replacement
01
Bay Shore Apartment Complex
A full tear-off and a new single-ply system across several connected buildings, staged so residents kept their access and no exposed deck was ever left open to weather overnight.
Commercial Roof Restoration
02
Brentwood Medical Center
A medical building that stayed open through the whole job. We restored the existing membrane, rebuilt drainage at the low spots that were holding water, and recoated the field, all sequenced around patient hours.
Roof Repair
03
Commack Retail Plaza
Chronic leaks over two storefronts traced back to split seams and a clogged interior drain. We reflashed, resealed, and cleared the drainage before the next storm rolled through.
Testimonial
What Suffolk Owners Say About the Work
Transparent Flat Roof Cost Options
What a Flat Roof Costs, and the Three Ways We Price It
Every roof gets priced after we walk it, because square footage, access, drain count, and how much wet insulation has to come off all move the number. Nearly every job lands in one of three scopes.
Essential Repair Plan
For a sound roof with a specific problem. Leak repair, reflashing, seam work, drain clearing, and snow removal, billed by the job or as a service call.
Complete Protection Plan
For a roof with life left in it. A coating or waterproofing layer plus scheduled inspections and maintenance, aimed at pushing the replacement years down the road.
Premium Installation Plan
For a roof at the end of its run. Full tear-off, new insulation and membrane, upgraded drainage, and the manufacturer and workmanship warranties that come with a brand new system.
Frequently Asked Questions
Questions We Hear From Suffolk Owners
Can you reroof a building while it stays open and occupied?
Usually, yes. Schools go over the summer, restaurants get the loud and fume-heavy work done before service, and warehouses let us stage on one end while the rest keeps moving freight. We build the schedule around your hours and close up any open deck tight before we leave each day.
Tear-off or recover: how do you decide?
It comes down to what is under the old membrane and how many layers are already up there. If the insulation is dry and the deck is solid, recovering over the existing roof saves money and time. If water has gotten into the system, or code says you have hit the layer limit, it has to come off. A moisture survey settles which one you are looking at.
How long does a commercial flat roof replacement take?
A small storefront can be a couple of days. A warehouse or a school with several roof sections runs anywhere from one to a few weeks, depending on tear-off, deck repairs, and weather windows. You get a real timeline with the quote, with anything that could shift it flagged up front.
Are you set up to work on schools, hospitals, and other public buildings?
Yes. We carry the licensing and insurance those jobs require, hold manufacturer certifications for the systems we install, and are used to the background checks, off-hours scheduling, and safety documentation that come with working around students, patients, and the public.
Why does water pool on a flat roof, and does it matter?
It pools because the roof has low spots or the drains and scuppers cannot move water fast enough. And yes, it matters. Standing water adds weight, breaks the membrane down faster than the rest of the field, and freezes into a heavier problem come winter. Fixing the slope or the drainage is almost always a smaller job than the damage it leads to.
Our Blogs
Things Worth Knowing Before You Reroof
We write up what we run into on local roofs: how to read a flat-roof quote without guessing, when a coating beats a full replacement, what a clogged drain really costs you by spring, and how the membrane systems stack up for a building like yours.
Excel Flat Roofing
Roof Failing Right Now? You Reach the Crew, Not an Answering Service.
Snow stacking up past what the deck should carry, a seam that split in a downpour, a drain pushing water into the ceiling tiles below. When a flat roof lets go, it lets go fast, and an occupied building cannot wait until Monday. Our emergency line puts you straight onto the people who do the work. We stop the water first with a temporary seal, then come back for the real repair once we can read the whole roof in daylight.