Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures. Engineered modified bitumen roofing membranes originated in Europe in the mid 1960’s and have been used successfully in the United States and Canada since approximately 1975. Modified Bitumen Roofing Systems are designed to withstand harsh exposure to extreme environmental elements. With five layers of protection, it’s one of the most trusted flat roofing systems used in the industry today.
The framework for Modified Bitumen Roofing Systems is a five-layer combination of roofing components.
- Insulation – Used to provide “R” value, or thermal resistance, for temperature stability of the roof system.
- Modified Base Sheets or Plies
- Modified Bitumen Membranes – Factory fabricated sheet membrane composed of co-polymer reinforced with polyester or fiberglass
- Adhesive – Waterproofing material with a bonding agent applied either hot or cold
- Surfacing – Provides UV protection and weathering resistance