Modified Bitumen (MB) roofing is an asphalt-based roofing system closely related to the Built-Up Roofing (BUR) design. This roofing material is suitable for buildings with low-scope or flat roofing. MB roofing originated in Europe in the mid-1960s and was adopted widely as a commercial roofing material across the US.
Engineered MB roofing material is popular because it performs optimally in harsh conditions, including cold weather. Mod-bit roofing consolidates into typically three to five layers of roofing components, making it one of the most trusted and durable flat roofing systems.
The elements making up the modified bitumen roofing system include:
- Insulation. This feature provides thermal resistance or the “R” value for temperature stability. It also provides a solid surface for the new roof system to be installed over.
- Modified Base Sheets. Base sheets are critical foundations for flat roofs; cap sheets offer redundancy when other layers develop a support problem. This is the first ply installed.
- Modified Bitumen Mid Ply Sheets. These are factory-fabricated sheet membranes composed of co-polymers reinforced with fiberglass or polyester. These are typically installed on plys 2-4
- Modified Cap Sheet. The top sheet that is typically installed with granules. This sheet provides weathering resistance or UV protection. This is the top ply installed, and what most people see what they look at a modified roof.
What makes mod-bit roofing a suitable roofing option for flat or low-scope roofs?
Benefits of Modified Bitumen (Mod-Bit) Roofing
- Modified bitumen has a proven track record of superior performance. The roof can withstand harsh environmental conditions, including cold temperatures.
- The modified bitumen has superior waterproof features, making it an ideal roofing material during winter.
- The material has a broad range of roofing applications, including commercial, residential, and industrial roofing.
- Modified bitumen has a wide choice of top surfacing, including “cool” and “warm” roofing varieties.
- This roofing material is available as wind, fire, or hail-rated roofing material.
- Competitive life cycle costs.
- Available in VOC-free and flame-free installation.
- Long-term warranties are available with many modified bitumen roofing systems.
- Modified bitumen roofing provides flexibility, energy-efficiency, and it’s easy to repair and maintain.
MB roofing combines fiberglass and polyester reinforcement to provide stronger tear resistance. The tear-resistance feature makes modified bitumen materials ideal for low-slope roofs.