Commercial, Retail, Hospitality, Government, and Multifamily
Modified Bitumen Roofing
Modified bitumen roofing is a durable, asphalt-based system that combines proven waterproofing with enhanced flexibility, strength, and weather resistance for low-slope commercial roofs.
What Is Modified Bitumen Roofing?
Modified bitumen roofing, often called Mod Bit roofing, is an asphalt-based commercial roofing system designed for flat and low-slope roofs. It builds on the proven performance of traditional built-up roofing while adding polymer modifiers that improve flexibility, strength, and weather resistance. The membrane is reinforced with fiberglass or polyester and is typically installed in one or two layers. Depending on the system, seams may be heat welded, cold adhered, self-adhered, or installed using hot asphalt. The result is a durable roofing system that’s well-suited for commercial buildings that demand reliable long-term performance.
Time-Tested, Built for Today.
Some commercial roofs need more than a standard membrane. They need a system that can handle heavy foot traffic, stand up to harsh weather, and deliver dependable waterproofing year after year. That’s where modified bitumen roofing shines.
At Dynamic National, we install, replace, repair, and maintain modified bitumen (Mod Bit) roofing systems for commercial buildings of every size. Whether you’re replacing an aging roof or planning a new roofing project, we’ll help you determine if a modified bitumen roof is the right fit for your building.
Why Choose Us for Mod Bit Roofing?
A roof isn’t just another building component—it’s one of your facility’s most important assets. At Dynamic National, we focus on helping owners make informed roofing decisions based on performance, lifecycle cost, and the specific needs of their building.
When you work with Dynamic National, you get:
• Experienced commercial roofing professionals
• Thorough roof evaluations
• Honest recommendations
• High-quality workmanship
• Clear communication from start to finish
• Long-term partnership focused on protecting your assets
Our goal is simple: install roofing systems that perform reliably and help you get the maximum return on your investment.
Manufacturer Certifications
Benefits of Modified Bitumen Roofing
There are many reasons property owners choose modified bitumen roofing over other alternatives. Find out about the main benefits below:
Built to Handle Foot Traffic
If technicians regularly service HVAC units or other rooftop equipment, your roof takes a beating. Modified bitumen holds up well to routine foot traffic, making it a strong choice for buildings with frequent rooftop access.
Excellent Waterproofing
Modified bitumen membranes are designed to create a continuous waterproof barrier that helps protect your building from leaks and moisture intrusion.
When properly installed and maintained, Mod Bit roofs provide dependable protection for decades.
Strong Puncture Resistance
Compared to many single-ply roofing systems, modified bitumen offers greater resistance to punctures and physical damage. That added durability can reduce repair costs over the life of the roof.
Performs Well in Changing Temperatures
The polymer modifiers added to the asphalt improve flexibility during temperature swings, allowing the roofing system to expand and contract without sacrificing performance.
Long-Term Value
With proper maintenance, a modified bitumen roof typically provides 20 to 30 years of service, making it a dependable long-term investment for many commercial properties.
Other Roofing Systems We Offer
Modified bitumen is just one of the many roofing systems we service, reroof and install. See below for all of the roofing systems we work with:
STONE-COATED STEEL ROOFING
BUILT-UP ROOFING
PVC ROOFING
EPDM ROOFING
TPO ROOFING
spf ROOFING
STEEP-SLOPE METAL ROOFING
low-slope METAL ROOFING
ASPHALT SHINGLE ROOFING
TILE ROOFING
roof coating
Types of Mod Bit Roofing Systems
SBS Modified Bitumen
SBS (Styrene-Butadiene-Styrene) modified bitumen is engineered for flexibility. It performs well in climates with significant temperature changes and is often selected where movement and expansion are concerns.
APP Modified Bitumen
APP (Atactic Polypropylene) modified bitumen provides excellent UV resistance and is commonly installed using heat-welded or torch-applied methods. It creates a durable, weather-resistant roofing surface.
Self-Adhered Modified Bitumen
Self-adhered systems eliminate the need for open flames during installation, making them an attractive option for occupied buildings or projects where minimizing disruption is important. Our team will recommend the system that best matches your building’s design, occupancy, and long-term performance goals.
FAQs About Modified Bitumen
Modified Bitumen vs. Built-Up Roofing (BUR)
Both are asphalt-based systems with a long history of proven performance. Built-up roofing uses multiple layers of reinforcing fabric and asphalt, while modified bitumen uses factory-manufactured reinforced membranes that generally require fewer installation layers.
Modified Bitumen vs. TPO
TPO is a lightweight, reflective single-ply membrane often selected for energy efficiency. Modified bitumen offers greater puncture resistance and is often preferred on roofs with heavy foot traffic or rooftop equipment.
Modified Bitumen vs. EPDM
EPDM is a flexible rubber membrane with fewer seams and excellent weather resistance. Modified bitumen provides a thicker roofing assembly and greater resistance to punctures and physical wear. The best roofing system depends on your building, budget, maintenance expectations, and long-term ownership plans. We’ll help you evaluate the options and recommend the solution that makes the most sense for your facility.
How long does a modified bitumen roof last?
Most modified bitumen roofing systems last 20 to 30 years with proper installation, routine inspections, and preventative maintenance.
Is modified bitumen good for flat roofs?
Yes. Modified bitumen is designed specifically for flat and low-slope commercial roofs and performs well on a wide range of building types.
Can a modified bitumen roof be repaired?
Yes. Regular inspections and preventative maintenance help maximize roof life, reduce unexpected repairs, and protect your warranty.
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