What Is Built-Up Roofing (BUR)
Understanding Built-Up Roofing (BUR) Systems for Commercial Properties
Built-Up Roofing (BUR) systems have been a staple in the commercial roofing industry for decades and are known for their durability and weather resistance. If you are a commercial property owner or property management company exploring roofing options, understanding the benefits and considerations of BUR systems is essential.
What is Built-Up Roofing (BUR)?
Built-Up Roofing (BUR) systems consist of multiple layers of bitumen (asphalt or coal tar) alternated with reinforcing fabrics such as fiberglass or polyester. These layers create a strong, waterproof membrane ideal for flat or low-slope commercial roofs.
Statistics on BUR Longevity
According to the National Roofing Contractors Association (NRCA), properly installed and maintained Built-Up Roofing (BUR) systems can last 20 to 30 years. This longevity makes BUR systems a cost-effective investment for commercial properties.
Pros & Cons of Built-Up Roofing (BUR) Systems
Pros of Built-Up Roofing (BUR) Systems:
- Proven Durability: BUR systems have a track record of withstanding harsh weather conditions and foot traffic.
- Effective Waterproofing: Multiple layers of bitumen provide excellent waterproofing capabilities.
- Fire Resistance: The gravel surfacing on BUR roofs enhances fire resistance, adding a layer of safety.
- Long Lifespan: With proper maintenance, BUR systems can last 20 to 30 years.
- Versatility: BUR systems can accommodate rooftop equipment and foot traffic without compromising performance.
Cons of Built-Up Roofing (BUR) Systems:
- Installation Complexity: BUR installation requires skilled labor and can be more labor-intensive than other roofing systems.
- Weight: BUR systems are relatively heavy and may require structural considerations during installation or replacement.
- Maintenance Needs: Regular maintenance and inspections are necessary to address potential issues and maximize lifespan.
Our Conclusion
In conclusion, Built-Up Roofing (BUR) systems offer commercial property owners and property management companies a durable and proven roofing solution. Considering factors like longevity, durability, and maintenance requirements, BUR systems can be a valuable investment for protecting commercial properties.
Are you considering Built-Up Roofing (BUR) for your commercial property? Consult with experienced Commercial Roofing Companies like Omega Contracting & Consulting to explore the best roofing options for your specific needs and budget.
Frequently Asked Questions About Built-Up Roofing (BUR)
Q: How does the cost of a Built-Up Roof (BUR) compare to single-ply systems?
A: BUR typically requires a higher upfront investment than single-ply systems like TPO or EPDM. However, because BUR uses multiple reinforcing layers that provide superior puncture resistance and long-term durability, it often delivers greater life-cycle value. Its ability to withstand heavy foot traffic and reduce leak risk makes it more cost-effective over the roof’s full lifespan.
Q: Is the weight of a BUR system a structural concern for older commercial buildings?
A: Yes, it can be. BUR is one of the heaviest commercial roofing systems due to its multiple layers of felt and bitumen, especially when gravel surfacing is used. Before installation, a structural engineer should evaluate the building’s load capacity to ensure the roof deck can support the additional weight.
Q: Why is leak detection more challenging with a Built-Up Roofing system?
A: Finding leaks can be difficult because BUR is a multi-layer system. Water may enter through a defect in the top layer and travel between lower layers before appearing inside the building, often far from the actual leak source. Locating leaks requires specialized testing and, in some cases, removing sections of roofing.
Q: How does BUR compare to TPO or EPDM regarding durability and foot traffic?
A: BUR is generally more durable under heavy foot traffic than TPO or EPDM. Its multiple layers and optional gravel surfacing provide superior redundancy against punctures and physical wear, making it a preferred choice for roofs with frequent maintenance access or heavy rooftop equipment.
Q: What installation process is used for BUR, and does it cause noise or odor disruption?
A: Most BUR systems are installed using hot-applied asphalt (hot-mop), which can produce strong fumes and odors that may disrupt building occupants. Some projects use cold-applied BUR adhesives, which reduce odors but may increase installation cost. Both methods require skilled labor and specialized equipment.
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