Preferred Roofing - Oklahoma's Trusted Roofing Contractor Since 1993

Modified Bitumen Roofing OKC

Multi-layer modified bitumen systems for superior weather resistance on flat and low-slope residential roofs.

Key Benefits

  • Multi-layer system for superior protection
  • Excellent tear and puncture resistance
  • Handles foot traffic well
  • Proven track record — 50+ years
  • Works well in extreme temperatures
  • Can be torch-applied or cold-applied
  • Reflective granule options available
  • Suitable for all flat roof applications

What is Modified Bitumen Roofing?

Modified bitumen is a time-tested roofing system that has been protecting flat and low-slope roofs for over 50 years. It's essentially an evolution of traditional built-up roofing (BUR), incorporating polymer modifiers — either APP (Atactic Polypropylene) or SBS (Styrene-Butadiene-Styrene) — that dramatically improve the performance of the base asphalt.

The result is a roofing membrane that is more flexible, more durable, and more resistant to the temperature extremes and weather conditions found in Oklahoma than traditional built-up roofing. Modified bitumen systems are installed in multiple layers, creating a redundant waterproofing system that provides excellent protection.

Types of Modified Bitumen Systems

  • APP Modified Bitumen (Torch-Applied): APP-modified membranes are typically installed using a propane torch to heat and bond the membrane to the substrate. APP systems are particularly resistant to UV degradation and perform well in high-temperature environments.
  • SBS Modified Bitumen (Cold-Applied or Self-Adhering): SBS-modified membranes are more flexible and rubber-like than APP systems. They can be installed using cold adhesives or as self-adhering membranes, making them a good choice for applications where open flame is not appropriate.

Modified Bitumen vs. Other Flat Roof Systems

Modified bitumen is often compared to TPO and EPDM for flat residential roofing applications:

  • vs. TPO: Modified bitumen is a multi-layer system that may provide more redundancy and is more tolerant of foot traffic. TPO offers better energy efficiency with its reflective white surface.
  • vs. EPDM: Modified bitumen typically offers better UV resistance and can be coated for reflectivity. EPDM is a single-ply system that is generally less expensive to install.
  • vs. Built-Up Roofing: Modified bitumen is easier to install, lighter, and more flexible than traditional built-up roofing while offering similar or better performance.

Is Modified Bitumen Right for Your Home?

Modified bitumen is an excellent choice for flat and low-slope residential roofs, particularly for homeowners who want a proven, multi-layer system with a long track record. It's also a good choice for roofs that see regular foot traffic from HVAC maintenance or other activities.

Contact Preferred Roofing today for a free inspection and estimate. We'll assess your roof and recommend the best system for your specific needs and budget.