Flat roofs are a common feature in many commercial and residential buildings, offering unique challenges and opportunities in roofing solutions. Among the various options available, Built-Up Roofing (BUR) and Modified Bitumen Roofing stand out for their reliability and performance. This article delves into the specifics of these two roofing systems, providing insights to help you make an informed decision for your roofing needs.
Built-Up Roofing (BUR): A Time-Tested Solution
What is Built-Up Roofing?
Built-Up Roofing, often referred to as BUR, is a traditional roofing system commonly used on flat roofs. It’s known for its durability and is composed of multiple layers. These layers include bitumen (asphalt or coal tar), ply sheets, and a top layer of aggregate, such as gravel or mineral granules.
Installation Techniques
The installation of a BUR system is a meticulous process that requires professional expertise. It involves alternating layers of bitumen and reinforcing fabrics, creating a finished membrane. The number of layers (or “plies”) can vary, typically ranging from three to five, depending on the required durability and the budget.
Advantages of BUR
- Durability: BUR systems are known for their longevity and ability to w