Built-Up Roofing Systems (BUR), also known as “Tar and Gravel Roofing,” are ideal for commercial and industrial buildings with flat or low-slope roofs. They offer superior durability and protection against elements through their multi-layered structure.

Core Components and Construction: BUR construction starts with a base sheet on the roof deck. It includes alternating layers of roofing felt and waterproof bitumen (asphalt or coal tar), typically three to five layers. The final layer is usually gravel or stone, protecting against UV rays and damage.

Waterproofing and Durability: The layered approach of BUR effectively prevents water penetration and leakage. If one layer fails, the others continue to protect.

Thermal Performance and Insulation: BUR systems provide excellent thermal insulation. They can be tailored for energy efficiency, helping control indoor temperature and cut heating/cooling costs.

Maintenance and Lifespan: Regular upkeep is key for BUR, with lifespans ranging from 15 to 30 years. Factors like environment, material quality, and maintenance affect longevity.

Applications: BUR is especially suited for large roofs in commercial and industrial buildings, reliable even in extreme weather.

For residential low-slope roofs, self-adhered APP modified granulated membranes like Polyglass are common, often used in patio roof re-roofing. Detailed installation instructions for this system are available for download.

In summary, Built-Up Roofing Systems combine long-lasting durability, water resistance, and thermal efficiency, making them an excellent choice for large roofing projects.