Modified Bitumen Roof Systems

Modified bitumen is a very durable product, especially in high-traffic areas and when confined to smaller roof areas with a high density of service equipment. The flexible nature of the “modifiers” allows owners to select a roof that is a thicker product and more resistant to building movement and metal-to-membrane interfaces than a built-up roof (BUR) system.

Modified Bitumen and Built-Up Roof Systems

North American Roofing offers cold applied (adhesive) anchoring when installing a modified built-up roof system. Cold-applied modified bitumen installations contribute to enhanced quality standards while promoting health and safety compliance.
North American Roofing always specifies a multi-layered approach due to quality issues, which precludes us from offering a sufficient warranty on single-layer modified bitumen roofing systems.
North American Roofing typically uses a base layer of fiberglass, topped with a reinforced layer of polyester. This yields a stronger, more puncture-resistant, and warrantable roofing system.

What is a Modified Bitumen Roof System?

A mod-bit roof is a type of asphalt-based roofing system designed for low-slope or flat commercial roofs. It’s essentially an evolution of built-up roofing (BUR), strengthened with polymer modifiers (like APP or SBS) that enhance flexibility, durability, and weather resistance.

Key Components

Base Sheets: Provide the foundation layer.
Modified Bitumen Membranes: Reinforced with fiberglass or polyester for strength.
Cap Sheets or Surfacing: Protect against UV rays, weather, and foot traffic.

Advantages of a Modified Bitumen Roof

Durability: Strong resistance to punctures, tears, and heavy foot traffic.
Flexibility: Can expand/contract with temperature swings without cracking.
Waterproofing: Excellent leak resistance when installed correctly.
Proven Performance: Decades of reliability in the commercial roofing industry.

A modified bitumen roof is a tough, flexible, asphalt-based system that’s been a trusted commercial roofing solution for decades — especially where durability and waterproofing are priorities. Get a quote for your roof, Call Now: (800) 551-5602