Introduction to Built-Up Roofing (BUR)
Built-up roofing (BUR) is one of the oldest and most reliable roofing systems used for flat and low-slope buildings. Commonly referred to as tar and gravel roofing, BUR consists of multiple layers of bitumen and reinforcing fabrics, providing excellent waterproofing and durability. This roofing system has been widely used in commercial, industrial, and some residential applications for over a century.
BUR remains a preferred choice for many property owners due to its strength, resistance to harsh weather conditions, and long lifespan. Its multi-layer construction enhances durability and helps prevent leaks, making it one of the most trusted roofing solutions available.
Advantages of Built-Up Roofing
Built-up roofing offers numerous benefits that make it a popular choice for commercial and industrial buildings:
- Durability: The multiple layers of bitumen and reinforcing fabrics create a tough, long-lasting surface.
- Waterproofing: BUR provides excellent water resistance due to its layered composition.
- Fire Resistance: Many BUR systems are designed with fire-resistant materials to improve safety.
- Low Maintenance: With proper installation, BUR requires minimal upkeep and offers long-term reliability.
- Energy Efficiency: Reflective coatings and gravel surfacing can help reduce heat absorption and lower cooling costs.
Types of Built-Up Roofing Systems
There are several types of BUR systems, each offering unique benefits:
- Hot-Applied BUR: Uses hot asphalt or coal tar as the adhesive between layers.
- Cold-Applied BUR: Utilizes cold adhesives and does not require heating during installation.
- Ballasted BUR: Features a protective layer of gravel or stone to enhance durability and UV resistance.
Common Applications of Built-Up Roofing
BUR is widely used in various settings, including:
- Commercial Buildings: Offices, warehouses, and retail stores often use BUR for its cost-effectiveness and reliability.
- Industrial Facilities: Factories and manufacturing plants benefit from BUR’s durability and waterproofing capabilities.
- Residential Homes: Some homeowners with flat or low-slope roofs opt for BUR due to its long lifespan.
Maintenance and Care
To ensure the longevity of a BUR system, regular maintenance is essential:
- Inspect the roof regularly for signs of wear, cracks, or ponding water.
- Keep the surface clean by removing debris and ensuring proper drainage.
- Apply protective coatings to extend the roof’s lifespan and enhance UV resistance.
- Schedule professional inspections to detect and address potential issues early.
When to Consider a Replacement
BUR is designed to last 20-30 years, but certain signs indicate the need for replacement:
- Extensive cracks or blistering of the surface layers.
- Persistent leaks despite multiple repairs.
- Loss of adhesion between layers, leading to roof instability.
- Visible water damage or structural issues in the building.
Conclusion
Built-up roofing remains one of the most reliable and cost-effective roofing solutions for flat and low-slope structures. Its multi-layer construction provides excellent durability, waterproofing, and fire resistance, making it a trusted choice for commercial and industrial buildings. With proper maintenance, a BUR system can offer decades of protection and energy efficiency.
