Modified bitumen (Mod-Bit) roofing is a highly durable solution, especially in high-traffic areas and smaller roof spaces densely packed with service equipment. Introduced in Europe in the 1960s as an evolution of Built-Up Roofing (BUR), Mod-Bit roofs are composed of alternating layers of asphalt, synthetic rubber, and a reinforcing scrim. These components work together to ensure your roof is UV-resistant, weatherproof, and watertight.
The flexible modifiers in Mod-Bit roofs allow owners to choose a thicker, more resilient product that offers better resistance to building movement and metal-to-membrane interfaces than traditional BUR systems. The bitumen in Mod-Bit roofs can be modified in two ways: with plastic (Atactic Polypropylene or APP) or synthetic rubber (Styrene Butadiene Styrene or SBS), giving the roof added flexibility and strength.
Modified Bitumen vs. Built-Up Roof Systems
- PSROOF installs modified built-up roof systems using cold-applied (adhesive) anchoring, ensuring higher quality and improved health and safety during installation.
- A multi-layered approach is standard at PSROOF, as we believe in providing durable, long-lasting systems. For this reason, we do not offer warranties on single-layer modified bitumen systems due to potential quality concerns.
- PSROOF typically constructs Mod-Bit roofs with a base layer of fiberglass, topped with a reinforced layer of polyester. This combination creates a stronger, more puncture-resistant, and warrantied roofing system designed to endure high-traffic and extreme conditions.
Benefits of Modified Bitumen Roofing
Durability:
Mod-Bit roofing systems are built to withstand heavy foot traffic, harsh weather conditions, and building movement. The multiple layers of asphalt, rubber, and reinforcing scrim offer superior strength and long-term performance, making it a reliable option for both commercial and industrial applications.
Waterproofing:
The multi-layer design of Mod-Bit roofs ensures an exceptionally watertight barrier. Whether it’s rain, snow, or ice, the reinforced layers prevent water penetration, protecting your building from leaks and water damage.
Flexibility:
Thanks to the modifiers in the bitumen, whether plastic (APP) or synthetic rubber (SBS), these roofs can adapt to temperature fluctuations and building movement. This flexibility helps prevent cracks and other damage that could compromise the integrity of the roof.
Energy Efficiency:
Mod-Bit roofs are available in reflective options that help reduce heat absorption, lowering cooling costs for your building. Their UV resistance further ensures energy efficiency by deflecting solar heat.
Customization:
With Mod-Bit roofing, you have the ability to customize based on your specific needs. From selecting the right thickness and type of modifier to choosing installation methods, Mod-Bit provides flexible options to meet a wide range of budget and performance requirements.