Modified Bitumen Roofing
The Most Popular Material
Flexible, Weather-Resistant Roofing for Commercial and Industrial Buildings
Modified Bitumen roofing combines the proven reliability of built-up roofing with modern materials engineered for flexibility and performance. Designed for low-slope commercial roofs, this system offers excellent waterproofing, resistance to temperature extremes, and long-lasting durability.
At St. Louis Roofing Co., we provide expert installation, repair, and maintenance of modified bitumen roofing systems across Missouri and Illinois. Whether torch-applied or cold-adhered, our certified crews deliver clean, compliant installs every time.
What Is Modified Bitumen Roofing?
Modified Bitumen (Mod Bit) is a multi-layer asphalt-based roofing system reinforced with fiberglass or polyester. It’s “modified” with rubber or plastic additives—such as APP (atactic polypropylene) or SBS (styrene-butadiene-styrene)—to enhance flexibility, durability, and weather resistance. Installed in rolls, Mod Bit systems are known for their strong seams and reliable waterproofing.
Why Choose Modified Bitumen?
Flexible Performance – Stays strong in both hot and cold climates without cracking
Layered Protection – Multi-ply systems offer redundancy and enhanced leak resistance
Installation Versatility – Available in torch-down, cold-adhesive, or self-adhered options
Proven Durability – Withstands foot traffic, UV exposure, and extreme weather
Flat Roofing Services We Offer
Modified Bitumen Installation
We install APP and SBS-modified systems using torch-down, cold adhesive, or self-adhered methods depending on your building’s needs. Our expert crews ensure proper layering, sealing, and surfacing for maximum protection and long-term performance.
Modified Bitumen Repair
Whether it’s seam separation, cracks, or weather-related damage, we provide quick and effective Mod Bit repairs. Our team is trained to identify and correct problem areas before they lead to leaks or structural issues.
Modified Bitumen Maintenance Programs
Routine maintenance helps protect your investment and extend the life of your Mod Bit roof. We offer tailored service plans that include visual inspections, patching, surface resealing, and drainage checks to keep your roof performing like new.
Contact Us About Modified Bitumen Services
Let’s Talk About Your Modified Bitumen Roof
Whether you need installation, repair, or a proactive maintenance plan, we’re here to help protect your property with reliable Mod Bit solutions.
Our Address
St. Louis Commercial Roofing
1722 Olive Street, Suite 203
St. Louis, MO 63103
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