Modified Bitumen Roof Repair and Installations

Dependable, high-performance modified bitumen roofing for commercial properties across South Jersey and the Greater Philadelphia area.

About Modified Bitumen Roofing

Modified bitumen roofing is the gold standard for flat and low-slope commercial buildings.

Our team specializes in precision installation and multi-layer reinforcement, delivering a robust, energy-efficient roofing solution that meets the specific structural demands of your facility in South Jersey and Philadelphia.

The Loonstyn Advantage: Why Modified Bitumen?

When it comes to flat or low-slope commercial roofing, modified bitumen remains a top choice for property owners who prioritize value and longevity. It bridges the gap between traditional asphalt-based systems and modern, high-performance technology.

Multi-Layered Protection

Modified bitumen is engineered with multiple reinforced layers. This creates a redundant, high-strength barrier that is remarkably effective at preventing leaks and standing up to the harsh freeze-thaw cycles we see in the South Jersey and Philadelphia areas.

Superior Puncture Resistance

Commercial roofs endure a lot—from foot traffic during maintenance to debris blown in by storms. The rubberized properties of mod-bit membranes provide excellent impact and puncture resistance, ensuring your roof stays intact even under heavy use.

Adaptable Installation Options

Whether your building requires a heat-welded application, cold-applied adhesive, or self-adhered system, we choose the right method for your specific structure. This versatility ensures a seamless, watertight seal around vents, drains, and HVAC units.

Energy Efficiency & Maintenance

: Many modern mod-bit membranes feature reflective surfacing that can significantly reduce your building's cooling costs. Plus, when it comes time for repairs, these systems are modular and straightforward to service, keeping your long-term maintenance costs predictable.

Experts in Modified Bitument Roof Installations in Philadelphia and South Jersey

For over 50 years, Loonstyn Roofing has been the trusted name in commercial roofing across the Delaware Valley.

The Philadelphia & South Jersey Modified Bitumen Specialists

From commercial warehouses to retail storefronts across Philadelphia and South Jersey, our expert crews specialize in heavy-duty modified bitumen (mod-bit) roofing systems designed to endure the region’s extreme seasonal shifts.

By utilizing premium, multi-layer membranes and advanced heat-welding techniques, we combine transparent communication with unmatched craftsmanship to deliver a commercial roof built for decades of performance.

Decades of Local Expertise

With 50 years of experience, we possess an intimate knowledge of commercial building codes and roofing requirements throughout the Philadelphia and South Jersey corridors.

Advanced Heat-Welded Seams

We specialize in professional-grade heat-welded installation, creating monolithic, watertight seams that are stronger than the material itself—eliminating the most common source of commercial roof leaks.

Puncture & Impact Resistance

Engineered with reinforced rubberized layers, our mod-bit systems offer superior protection against heavy foot traffic, HVAC maintenance, and storm-related debris.

Comprehensive System Restoration

Whether it’s a full tear-off and replacement or a strategic recover over your existing system, we conduct deep-deck inspections to identify structural concerns before they become expensive problems.

Common MOdified Bitumen Roof Issues

To ensure your commercial property remains protected, it’s important to recognize the early warning signs of membrane distress. Even the most durable modified bitumen (mod-bit) roofs can develop issues due to extreme local weather, natural aging, or heavy rooftop traffic.

At Loonstyn Roofing, we recommend keeping an eye out for these common issues that often require a professional inspection or repair:

Ponding Water

Because mod-bit is typically used on flat or low-slope roofs, poor drainage can lead to standing water. If water remains on your roof for more than 48 hours, it can accelerate membrane degradation and lead to leaks.

Blistering

These visible bubbles form when air or moisture becomes trapped beneath the membrane layers. As temperatures shift, these gases expand and push the material apart, eventually causing the membrane to rupture and allowing water to enter.

Cracking and Splitting

The constant expansion and contraction from Philadelphia’s seasonal temperature swings can lead to hairline fractures or deep splits in the bitumen. If left untreated, these cracks widen, leaving the underlying structure vulnerable.

Granule Loss

The protective mineral granules on top of your cap sheet are the roof's primary defense against harsh UV radiation. If you notice "bald spots" where the black membrane is exposed, your roof is losing its ability to reflect heat and resist weather damage.

Seam Failures

The seams—where sheets of material overlap—and flashing around vents, HVAC units, and drains are the most frequent points of failure. If the adhesive or heat-weld begins to pull away or deteriorate, water can easily seep beneath the roofing system.

Punctures and Tears

Commercial roofs often host HVAC equipment and other rooftop units. Foot traffic during regular maintenance or falling debris from storms can cause physical punctures that require professional patching to maintain a watertight seal.

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Modified Bitumen Roofing FAQs

What is the average lifespan of a modified bitumen roof?

With proper installation and regular maintenance, a high-quality modified bitumen roof typically lasts between 20 to 30 years. At Loonstyn Roofing, we extend the service life of these systems by focusing on precise seam welding and robust flashing details to prevent premature degradation.

Is modified bitumen better than EPDM (rubber roofing)?

Both are excellent for commercial properties, but they have different strengths. Modified bitumen is generally more resistant to foot traffic and physical punctures compared to EPDM, making it an ideal choice for roofs that house HVAC units or require frequent maintenance access. It also offers the added protection of multiple reinforced layers.

Can you install modified bitumen over an existing roof?

In many cases, yes. If your existing substrate is structurally sound and dry, a "recover" installation (placing a new layer over the old) can be a cost-effective way to refresh your roof. However, we always perform a moisture survey first to ensure there is no trapped water underneath before we proceed with a new installation.

How does modified bitumen handle South Jersey’s weather?

Modified bitumen is engineered for the extreme seasonal fluctuations in the Philadelphia and South Jersey region. The rubber-like polymers in the membrane allow the roof to expand and contract with temperature shifts without cracking, while its multi-layer construction provides superior resistance to heavy rain and snow load.

How are seams handled to prevent future leaks?

Seams are the most critical part of a flat roof. We use professional-grade heat-welding techniques for our asphalt-based systems. This creates a monolithic, watertight bond that is actually stronger than the membrane itself, ensuring that potential leak points are sealed permanently.

Do you provide emergency repairs for modified bitumen roofs?

Yes. We understand that a commercial roof leak can disrupt your business operations. Loonstyn Roofing provides prompt inspection and repair services for commercial clients across South Jersey and Philadelphia. Whether it’s a minor puncture or a significant seam failure, we work quickly to get your building secure and dry again.

We're Here to Help with your Roofing Needs

The worker puts roofing material in the open air

At Loonstyn Roofing, we don’t just install a roof—we install a system.

We pay meticulous attention to the "critical points"—the seams, flashing, and terminations—where most roofing systems fail.

By choosing us for your modified bitumen installation, you are ensuring your project is handled with the local expertise and technical precision your business deserves.

Areas We Serve Flat Roofing

Philadelphia Area

Philly Suburbs

Philly Neighborhoods

Fairmount, Fishtown, Germantown, Manayunk, Mount Airy, Northern Liberties, Port Richmond, Rittenhouse Square, South Philadelphia, University City

South Jersey Area

Absecon, Atlantic City, Brigantine, Egg Harbor City, Egg Harbor Township, Galloway, Linwood, Margate City, Marmora, Mays Landing, Northfield, Pleasantville, Somers Point, Ventnor City

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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