Built-up roofing, or BUR for short, is a roofing system consisting of multiple layers of asphalt applied between ply sheets (or felts) over the roof deck and insulation. Known for its durability, BUR provides excellent protection against weather and heavy-duty impacts. These layers are topped off with a cap sheet or a flood coat of asphalt and granules, creating a robust and long-lasting roofing solution.
What Does Built-up Roofing Stand For?
Built-up roofing, abbreviated as BUR, is a multi-layered roofing system that dates back to its origins as the first “flat” roofs used in construction. The system’s design emphasizes redundancy, making it a reliable choice for protecting structures from environmental elements.
What Is Built-up Roofing Made Of?
A typical built-up roofing system consists of alternating layers of reinforcing fabrics, bitumen (often asphalt), and surfacing materials like gravel. This combination creates a waterproof, continuous sealed surface that offers exceptional protection compared to other roofing types.
How Long Has Built-up Roofing Been Around?
Built-up roofing systems have been in use for over 100 years in the United States, making them one of the most time-tested and trusted flat roofing solutions.
What Goes Under Built-up Roofing System?
A built-up roofing (BUR) system is constructed with multiple layers designed to ensure durability and long-lasting protection. These layers typically include:
- Roof Deck
- Vapor Barrier
- Insulation
- Base Ply
- Bitumen Layer
- Cap Sheet (optional)
What Colors Does Built-up Roofing Come In?
Built-up roofing (BUR) systems are available in a range of colors, including black, gray, white, brown, and green. The choice of color depends on the materials used and the manufacturer, allowing customization to suit the building’s aesthetics.
How Thick Is Built-up Roofing?
Built-up roofing systems typically include two to four layers, with thickness varying based on the materials and the number of plies used. The selvage area generally ranges between 2 to 4 inches, ensuring robust protection.
What Is The Life Expectancy Of A Built-up Roof?
A well-installed built-up roofing system has a typical lifespan of 20 to 30 years. The longevity depends on factors like the quality of installation, the number of layers (or plies), and regular maintenance.
Is Built-up Roofing Hail Resistant?
Built-up roofing (BUR) offers excellent hail resistance. Smooth-surfaced BUR systems can typically withstand hail up to 2 inches in diameter, while ballasted BUR systems can resist hail up to 2.5 inches in diameter, ensuring reliable protection in hail-prone areas.
How Much Does Built-up Roofing Cost?
The cost of a built-up roofing system ranges from $2.75 to $6 per square foot, fully installed. Factors influencing the price include the size of the roof, the complexity of the installation process, and additional materials required for the project.
