A commercial roofing system must offer durability, longevity, and energy efficiency to protect a business investment. Built-up roofing (BUR) has been a preferred option for flat or low-slope commercial roofs for over a century, providing multiple layers of waterproofing and superior resistance to harsh weather conditions. Businesses seeking a cost-effective and long-lasting roofing solution should consider the benefits of a BUR system.
What is a Built-Up Roof?
A built-up roof is constructed with multiple layers of bitumen, either asphalt or coal tar, interwoven with reinforcing fabrics like fiberglass or organic mats. These layers are then finished with a protective top coating or surfacing material, such as gravel or reflective coatings. This design creates a seamless, watertight barrier that improves insulation and enhances durability.
Advantages of a Built-Up Commercial Roof
1. Exceptional Durability and Longevity
A built-up roof can last 20-30 years with proper installation and maintenance. The multiple layers of bitumen and reinforcing materials create a tough, resilient surface that withstands foot traffic, extreme weather, and environmental pollutants.
- Key durability features:
- Resistant to UV radiation, preventing premature degradation
- High tensile strength reduces the risk of cracks and leaks
- Capable of withstanding heavy rains, hail, and temperature fluctuations
2. Superior Waterproofing and Leak Prevention
The multi-layered construction of a BUR system makes it one of the most waterproof commercial roofing options available. Each layer acts as an additional barrier, reducing the risk of water infiltration.
- How BUR prevents leaks:
- Hot-applied bitumen bonds seamlessly, eliminating weak points
- The top layer (gravel, asphalt, or a reflective coating) further repels moisture
- Fiberglass reinforcement prevents material breakdown over time
3. Cost-Effectiveness and Low Maintenance
While the initial installation of a built-up roof may be higher than some single-ply systems, the long-term savings make it a cost-effective investment. Its low maintenance requirements and ability to resist common roofing issues reduce repair expenses over time.
- Why BUR is cost-effective:
- Lower repair costs compared to single-ply membranes
- Extended lifespan reduces the need for premature replacements
- Requires minimal upkeep beyond periodic inspections and cleaning
4. Energy Efficiency and Insulation Benefits
A built-up roof contributes to energy savings by providing excellent insulation. The thick layers of roofing material prevent heat transfer, helping maintain stable indoor temperatures.
- Energy-saving features:
- Reflective coatings reduce cooling costs in hot climates
- Added insulation lowers heating expenses in colder regions
- Meets ENERGY STAR® and LEED certification standards for sustainability
5. Fire Resistance and Safety
BUR systems provide high fire resistance, particularly when using gravel surfacing or fire-retardant coatings. This makes them an ideal choice for commercial buildings where fire protection is a priority.
- Fire-resistant benefits:
- Gravel and asphalt top layers act as a fire barrier
- Coal tar-based BUR systems offer additional fire resistance
- Complies with fire safety regulations for commercial buildings
Comparing Built-Up Roofing to Other Commercial Roofing Systems
| Feature | Built-Up Roof (BUR) | Single-Ply Membrane (TPO, PVC) | Modified Bitumen | Metal Roofing |
| Lifespan | 20-30 years | 15-25 years | 20-25 years | 40+ years |
| Waterproofing | Excellent | Moderate to High | High | High |
| Maintenance Needs | Low | Moderate | Moderate | Low |
| Fire Resistance | High | Varies | High | High |
| Insulation Properties | High | Moderate | Moderate | Low to Moderate |
| Installation Cost | Moderate | Low to Moderate | Moderate | High |
Considerations for Installing a Built-Up Roof
Roof Load Capacity
The weight of a BUR system is higher than that of single-ply membranes, requiring a structural assessment before installation. Buildings must have sufficient load-bearing capacity to support the multiple layers of bitumen and surfacing material.
Professional Installation is Key
Proper installation ensures that the roof is fully sealed, waterproofed, and built to last. Hiring an experienced roofing contractor guarantees that the system is applied correctly and meets industry standards.
Vera Roofing And Construction, located in Midlothian, TX, specializes in high-performance commercial roofing systems, including built-up roofing. As a GAF Master Elite Contractor and Firestone/Elevate Licensed Contractor for Commercial Roofs, we provide expert installation and maintenance services. With an A+ BBB rating, we work with top-tier manufacturers such as GAF, Owens Corning, CertainTeed, Atlas, IKO, Firestone/Elevate, Mulehide, and F Wave, ensuring quality and durability in every project.
FAQs
1. How long does a built-up roof last?
A well-maintained BUR system can last between 20-30 years, depending on climate conditions and maintenance.
2. Is a built-up roof better than a single-ply membrane?
BUR offers superior waterproofing, insulation, and fire resistance, while single-ply membranes may be more cost-effective and lighter in weight.
3. What type of maintenance does a BUR system require?
Routine inspections, debris removal, and occasional resealing of flashing areas help extend the lifespan of a BUR roof.
4. Can a built-up roof be installed over an existing roof?
Yes, in some cases, a BUR system can be applied over an existing roof if the structure meets weight capacity requirements.
5. Is a BUR system environmentally friendly?
BUR can be made with sustainable materials, and reflective coatings improve energy efficiency, reducing overall environmental impact.
Conclusion
A built-up roof provides superior durability, waterproofing, and insulation, making it an ideal choice for commercial buildings. With proper installation and maintenance, a BUR system delivers long-term performance and cost savings, ensuring reliable protection for decades. Businesses investing in built-up roofing benefit from enhanced safety, energy efficiency, and a lower total cost of ownership over time.
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