Flat Roofing

Flat Roofing Installation and Repair Services for Philadelphia and South Jersey.

About Flat Roofing

Flat roofing systems are a popular choice for both residential and commercial properties, especially in urban areas like Philadelphia and South Jersey. They are efficient to install, cost-effective, and can last 20–30 years or more with proper maintenance.

A typical flat roof is made up of multiple layers, including insulation, a waterproof membrane (such as EPDM, TPO, or modified bitumen), and protective coatings. These materials work together to create a durable, weather-resistant barrier that prevents water from penetrating the structure.

Flat roofing systems come in several types, each offering different benefits depending on your needs and budget. Whether you choose rubber roofing (EPDM), TPO, or modified bitumen, flat roofs are designed for durability, energy efficiency, and long-term performance.

Flat roofs are built to protect your property from the elements while providing a clean, modern look. With proper installation and routine maintenance, they offer reliable protection against rain, UV exposure, and temperature fluctuations—making them a smart, practical roofing solution.

Flat Roofing Services We Offer

For over 50 years, homeowners and businesses across Greater Philadelphia and South Jersey have trusted Loonstyn Roofing to deliver flawless, watertight flat roofing solutions. Managing a flat roof demands far more than just rolling out a membrane; it requires specialized technical expertise in urban rowhome structures, shifting historic brick party-walls, and precise drainage mechanics.

High-Performance TPO & EPDM Membrane Systems

Commercial-Grade TPO Installations: Precision heat-welded Thermoplastic Olefin (TPO) systems designed for maximum energy efficiency, high solar reflectivity, and long-term puncture resistance on city flat roofs.
Heavy-Duty EPDM Rubber Roofing: Clean, durable Ethylene Propylene Diene Monomer (EPDM) rubber installations ideal for residential rowhouses, offering exceptional resistance to extreme Philadelphia winter freezes and summer heat waves.
Multi-Layer Modified Bitumen Systems: Traditional torch-down and self-adhering asphalt roofing applied with modern techniques to provide ultra-thick, multi-layered waterproof protection for classic city architectures.

Flat Roof Drainage & Pitch Optimization

Tapered Insulation System Layouts: Custom-engineered sloped insulation boards installed beneath the membrane to eliminate structural "ponding water" and naturally direct heavy rainfall toward active drainage points.
Scupper, Drain, and Downspout Restorations: Heavy-duty cleanouts, retrofits, and widening of internal drains and exterior wall scuppers to prevent structural water backups during severe downpours.
Saddle and Cricket Installations: Specialized contour framing built behind chimneys, HVAC curbs, and firewall obstructions to divert water flow away from high-risk, leak-prone seams.

Parapet Wall, Firewall, and Capping Services

Brick Party-Wall Waterproofing: Specialized masonry sealing, tuckpointing, and breathable coatings applied to shared rowhouse parapet walls to prevent moisture from seeping between dividing properties.
Custom Metal Parapet Capping: Precision-fabricated aluminum or copper coping stones and metal caps locked over wall tops to completely seal exposed masonry from rain and snow.
Counter-Flashing & Reglet Upgrades: Deeply inset metal counter-flashing cut into mortar joints to permanently secure the roofing membrane where it meets vertical brick surfaces.

Preventive Flat Roof Coatings & Maintenance

Reflective Silicone Roof Coatings: Seamless, liquid-applied silicone restorations that repair hairline cracks, seal aging seams, and drop roof temperatures significantly to fight the urban heat island effect.
Routine Seam and Flashing Audits: Comprehensive preventative maintenance sweeps focused on reinforcing target wear points, clearing organic roof debris, and proactively resealing perimeter edges.
HVAC Curb and Hatch Sealing: Specialized flashing and gasket updates around roof access hatches, skylights, and commercial rooftop climate control units to guarantee absolute airtight waterproofing.

Experts in Flat Roof Installations in Philadelphia and South Jersey

For over 50 years, Loonstyn Roofing has provided high-performance roof replacements across the Delaware Valley.

The Local Philadelphia and South Jersey Flat Roofing Pros

From Philadelphia rowhomes to South Jersey properties, our expert crews install high-performance flat roofing systems designed to handle the region’s changing weather conditions. Using trusted materials like TPO, EPDM, and modified bitumen, we combine transparent pricing with precise workmanship to deliver a flat roof built for long-term durability and efficiency.

Local Code Expertise

Decades of experience navigating commercial and residential flat roofing requirements across Philadelphia and South Jersey.

Waterproof Membrane Systems

Installation of premium single-ply membranes and multi-layer systems engineered to prevent leaks and withstand ponding water.

Optimized Drainage Design

Proper slope, tapered insulation, and drainage solutions to eliminate standing water and extend roof lifespan.

Full System Tear-Off & Inspection

Complete removal down to the deck when needed, allowing us to identify hidden damage and ensure a strong, reliable foundation.

Common Flat Roof Issues

Flat roofs are durable and efficient, but they require proper maintenance to perform at their best. Because they have little to no slope, flat roofing systems are more susceptible to certain issues—especially in climates like Philadelphia and South Jersey where weather conditions can vary significantly throughout the year.

Ponding Water

Flat roofs are designed to drain, but poor drainage or clogged systems can cause water to collect and sit on the surface. Standing water can weaken the roofing material over time and lead to leaks.

Membrane Damage

The waterproof membrane (EPDM, TPO, or modified bitumen) can crack, blister, or tear due to age, weather exposure, or foot traffic. Even small повреждения can allow water to penetrate the roof.

Seam Separation

Seams are one of the most vulnerable areas on a flat roof. Over time, they can separate due to temperature changes or improper installation, creating entry points for water.

UV and Weather Exposure

Constant exposure to sunlight and temperature fluctuations can cause roofing materials to degrade, leading to brittleness and reduced lifespan.

Clogged Drains and Scuppers

Leaves and debris can block drainage systems, causing water to back up and increase the risk of ponding and leaks.

Shrinkage

Some flat roofing materials can shrink over time, pulling away from edges and flashing and creating gaps where water can enter.

Get Your Free Estimate Today!

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Flat Roofing FAQs

How do flat roofs drain water if they’re not sloped?

Flat roofs aren’t completely flat—they have a slight pitch that directs water toward drains, scuppers, or gutters. These drainage systems are critical to prevent ponding water and must be kept clear of debris.

What is ponding water and how serious is it?

Ponding water occurs when water sits on a flat roof for more than 48 hours after rainfall. Over time, it can weaken the membrane, lead to leaks, and significantly shorten the lifespan of your roof.

What is the best material for flat roofing in Philadelphia?

Common flat roofing materials include EPDM (rubber), TPO, and modified bitumen. TPO is popular for energy efficiency, EPDM for durability, and modified bitumen for multi-layer protection—each suited for different needs and budgets.

How do I know if my flat roof membrane is failing?

Signs include:

Cracks, blisters, or bubbles in the membrane
Visible seams pulling apartSoft
or spongy spots
Water stains on ceilings inside the building

Can you repair a flat roof, or does it need to be replaced?

Many flat roof issues can be repaired, especially if caught early. However, widespread membrane damage, repeated leaks, or aging materials may require a full replacement.

How often should a flat roof be inspected?

Flat roofs should be inspected at least twice a year, typically in the spring and fall, and after major storms. Regular inspections help catch issues like ponding water, membrane damage, and drainage problems early.

We're Here to Help with your Flat Roofing Needs

The worker puts roofing material in the open air

Replacing or repairing your flat roof doesn’t have to be a hassle. Loonstyn Roofing, your trusted Philadelphia roofing contractor, can help you choose the right system—EPDM, TPO, or modified bitumen—and provide a free estimate. If a full replacement isn’t needed, we also offer reliable flat roof repairs.

We inspect and repair flat roofs quickly and efficiently, focusing on long-lasting results. Financing options are available for replacements when needed.

Get a quote for flat roofing today. Loonstyn Roofing proudly serves Philadelphia, Montgomery County, Bucks County, and South Jersey with over 200 years of combined experience.

Areas We Serve Flat Roofing

Philadelphia Area

Philly Suburbs

Philly Neighborhoods

South Jersey Area

Areas We Serve

What our customer say

Loonstyn Roofing

4.9

Based on 255 reviews

review us on

Brian Bishara

2 months ago

Ellen Kruger

2 months ago

We are so glad we chose Loonstyn Roofing for our flat roof replacement. We were dreading needing to have our old roof (and all the other old roofs underneath it that had been layered on before we owned the house, yikes!!) completely torn off and replaced. John and the rest of the crew from Loonstyn made the experience as stress free as possible. They were able to complete the work quickly and for a reasonable price, and took the time to make needed repairs before putting on our new roof, which looks amazing. All communication with them was prompt and professional. We're really glad we found this company!!

Kristin Daly

3 months ago

Very efficient, organized, and responsive. Thank you so much for your attention! Experts!

Sarah Mitchell

3 months ago

Ryan Brunsvold

3 months ago

John came out to inspect a recent leak. He diagnosed the issues I was having, gave me several repair options, and delivered multiple, detailed quotes quickly. The repair was fast, professional, and high quality. Great experience throughout.

Raymond Ng

3 months ago

CAROLYN

3 months ago

Wonderful service, A++++++++ Loonstyn Roofing is the best.

John Friend

3 months ago

Loonstyn roofing was very professional, exceptionally quick and easy to work with. The work was completed quickly and looks great

Lisa Homa

3 months ago

Swift response, diagnosis and service. Plus, reasonable price.

Jacose Bell

4 months ago

Frank reminds me of what customer service used to mean and his care and communication around our roof project has been exceptional - along with the work!

Jack Garrett

4 months ago

Loonstyn was great. We had an ice dam leak over the winter and finally got around to calling them this spring. They setup an appointment for the next day and John came out right on time and took drone footage of our entire roof and showed me everything. He confirmed what our home inspector said that the roof was in generally good shape, minus some of the flashing needed service. I never felt like he was trying to upsell anything and he was very trustworthy. He suggested a very fairly priced servicing appointment to fix all of the flashing and a downspout box leak spot. The crew came out first thing the next day and quickly completed the job perfectly. They accidentally forgot one spot, I texted John, and rather than waiting for his crew to get back to my house, he came and finished the job himself. Top notch, trustworthy service at a fair price! Will definitely be using Loonstyn Roofing in the future.

Chris Powers

4 months ago

Full roof tear off and replacement - great communication - hardworking and friendly crews - addressed needs - all clean upon completion Thank you greatly!

Kosta Katseftis

4 months ago

Nice job thanks guys

Winnie DeMarco

4 months ago

Great outfit and have used them before. Reasonable prices and just a great bunch of guys. Would not use anyone else for my roofing needs.

Blaise Palmieri

5 months ago

Exceptional experience from start to finish. Came out when I was in need of work on my roof rather quickly. Identified the issue and recommended solution. Within 3 days my roof was replaced (and that was because they were working around weather or it would have been quicker). Would absolutely recommend for anyone in need of work on their roof.

Nicole LaGreca

5 months ago

I have been using Loonstyn for over 20 years on my own home, my parents home and my renovation projects. Honest, reliable and they stand by their work.

Susan McCaffrey

5 months ago

Excellent and professional. They were timely with quotes and repairs. I would highly recommend Loonstyn Roofing

Nelson Orellana

5 months ago

Nikyah Walker

6 months ago

I first discovered this company in 2023 when they did my entire roof, and they just serviced it again in February. I’m under contract/ warranty for roofing services every three years, and they handle all necessary repairs. Not only is their quality of work outstanding and prices incredibly affordable, but they are also incredibly nice, flexible, and accommodating. I highly recommend them!

Clifford Vaida

6 months ago

Frank provided a review, explanation, and estimate the very day we contacted Loonstyn, and the cost was much more competitive than other roofers. A couple days later Bob and his crew arrived and after a couple hours had put covers on the gutter and sealed up the roof along the edges of both 2d and 3d floor roofs. The work looks good for sure, and the rapid response and good price are satisfying. I am withholding one star because I won't know how effective the work is in preventing further leaks until the snows return in winter.

Kris From Philly

6 months ago

They were quick to come out to look at the roof and it was done just a few days after. It was fast and well done. I own my patents house now, they had it 58 years and me for 2. Loonstyn had always done their roof and will continue to do mine.

Todd Hacker

6 months ago

Mouse Fellow

7 months ago

Affordable in comparison to two other companies. Fast, professional and friendly

Alia Al-Khatib

7 months ago

They were responsive and reliable. Highly recommend!

StevenTodd Shacker

7 months ago

gerard charles

7 months ago

I believe they performed a good service on my roof, but do not expect anything beyond that or their wish to establish a long term relationship. Initially very quick and efficient service. We had our roof inspected within a day, and were given good information as to the state of the roof and what could and could not be done for it. The estimate was reasonable and a new roof covering was applied in another day. The team that did the work were self sufficient and left the area clean and clear. Unfortunately lack of follow up service and strict adhearance to fine print has voided my warranty within the first month.

Charles Robin

7 months ago

Jim Romary

7 months ago

Frank was great when he came out fo assess what needs to be done to fix a roof leak. He was fast and efficient, and had drone pictures to illustrate what the current roof condition was. The crew that came to lay down the modified bitumen (most common with Philly flat roofs) was also very fast, efficient, and very clean. There is no trace that they were here.

Donna Walton

7 months ago

Loonstyn Roofing did a great job on my roof this past wk. they put a completely new roof and flashing on. They were prompt, neat, organized and efficient during the process. They are fair with their pricing and very trustworthy. I would recommend they highly.

Diane Cohen

7 months ago

Highly professional, great work and crew, returns calls promptly. Above and beyond.

Jim Onesti

7 months ago

Frank is the man. super responsive and professional.

Jennifer Izaguirre

7 months ago

I’ve had nothing but great experiences working with Jack and his crew over the past year. They repaired siding at my house last year that was immediately put to test with strong winds and rain, and this year they were quick to help again after the snowstorm, when I dealt with issues from the snow on my roof. Jack is very responsive and always explains the issue and the work needed in a way that’s easy to understand. His crew is fast, efficient, and took the time to walk me through what they were seeing and fixing. I really appreciate their professionalism and communication and would happily recommend them!

Justin Kutner

8 months ago

A gentleman came out to my house last April after my entryway showed a leak cause our area had a ton of rainfall. He got right up on the roof and found an area that wasn't properly sealed, and he sealed it up on the spot- at no cost to me. What was supposed to be a free estimate turned into an immediate solution. He was professional, kind, and personable. I really appreciate what he did and if I ever need roof repairs, I heartily recommend the folks at FM & Loonstyn.

Nicole Allman

10 months ago

We're so grateful that a friend recommended FM & Loonstyn Roofing when we were in need of a repair to address a leak. When we reached out for a quote, Frank and team responded promptly and gave us a very helpful, thorough explanation of the work that needed to be done. Of all the quotes we received, FM & Loonstyn's really stood out for meaningfully addressing the leak, doing so at a reasonable price, and providing a quick turnaround (which felt especially important as winter temperatures set in). With the repair now complete, we're very pleased with our experience with FM & Loonstyn Roofing overall and would definitely recommend their services. Thank you so much, FM & Loonstyn Roofing team!

Melanie McConnell

10 months ago

Frank and his team are the absolute best! Frank is the only roofer that I would ever call and the only roofer that I would ever refer my clients, friends and neighbors to. He has handled everything from a regular flat roof in the city, to a shingled roof in the suburbs, to a massive multi family property in a historic district for various clients of mine and every single time has delivered the A+ standard of service. Highly recommend !!

Matthew Walsh

10 months ago

Great experience working with FM & Loonstyn. They were prompt in getting out to give an estimate, transparent in their assessment that we weren’t in urgent need of a new roof, patient in answering my many questions, and then quick to get us on the schedule to do the work. Finished product looks good — plus, you get the peace of mind with the 12 year warranty. I’d recommend them to a friend or family member.

Abbie H.

11 months ago

My husband and I were very pleased with the work FM & Loonstyn did on our house. We had both our flat roofs and mansard replaced. Replacing a Victorian mansard roof is no easy feat, but the team tackled it tremendously with their expert skills and collaboration. They were always prompt and gave us realistic time windows for when the work would be finished. Communication with Frank was clear and seamless. Prior to getting our roof replaced, we had a leak. We no longer have leaking and have a roof that will last us years to come. We’re very happy with the final results.

Abbie Herron

11 months ago

Leanne

11 months ago

I had a great experience with Loonstyn Roofing. Frank was responsive from the start, came out quickly to evaluate my roof, and gave a thorough and honest assessment with multiple options for repair or replacement. He always answered my questions quickly and clearly throughout the process. I decided on a full tear-off and roof replacement. The crew did an excellent job, worked efficiently, and went above and beyond by hanging plastic to protect areas where ceilings had been opened for mold remediation. They removed the plastic and even vacuumed when the work was done. They also provided photos before, during, and after the project, which was really helpful. A couple of weeks later, I noticed a small water intrusion. The team came out quickly, identified the issue, and fixed it right away. I got several quotes, including cheaper ones, but I felt the most confident working with Frank, and the quality of the work proved it was the right choice and worth the cost. Highly recommend Loonstyn Roofing!

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