What Is Built Up Roof? (6 Benefits)
Written by
Leroy Whitt
If you’re a property manager looking for durable, cost-effective, and long-lasting roofing solutions for your commercial buildings, a built-up roof (BUR) might just be the answer you’ve been searching for. At Whitt’s Quality Roofing, we understand how vital a reliable roof is to protecting your property, tenants, and investment. That’s why we’re here to guide you through everything you need to know about built-up roofs:
- What they are
- Their specific benefits for property managers
- The installation process
Whether you’re managing an office building, retail space, or industrial property, this comprehensive guide will provide you with detailed insights to help you make an informed decision.
What Is a Built-Up Roof (BUR)?
A built-up roof (BUR) is one of the oldest, most reliable types of roofing systems for flat or low-slope roofs. Often called “tar and gravel” roofing, it consists of multiple layers (or “plies”) of bitumen (asphalt or coal tar) alternated with reinforcing fabrics, topped with a layer of gravel or other aggregate for protection.
Components of a Built-Up Roof:
- Roof Deck: The foundation of the roof, made from materials like steel, wood, or concrete.
- Ply Sheets: Reinforcing fabrics, often made from fiberglass, that add strength and stability.
- Bitumen: Asphalt or coal tar serves as the adhesive and water-resistant layer.
- Surfacing Material: Gravel, crushed stone, or mineral granules act as the top protective layer, helping with UV resistance and impact protection.
This multi-layered design provides exceptional durability and is proven to withstand harsh weather conditions, including heavy rains, strong winds, and prolonged UV exposure.
Why Choose a Built-Up Roof? 6 Benefits
For property managers, a BUR is more than just a traditional roofing system—it’s an investment in durability, energy efficiency, and peace of mind. Here are several reasons why a built-up roof might be the perfect choice for your commercial property:
1) Proven Durability
BUR systems have been used for over a century, standing the test of time. The multiple layers provide robust resistance to punctures, tears, and heavy foot traffic—ideal for properties where maintenance workers or HVAC technicians frequently access the roof.
2) Low Maintenance
Once installed, BUR roofs require minimal maintenance, reducing both your workload and operating costs. The gravel or aggregate layer protects against wear and tear, extending the roof’s lifespan.
3) Weather Resistance
Whether it’s blazing sun, torrential rain, or icy snow, BUR systems are built to handle extreme weather. The tar and gravel layers create a watertight seal that prevents leaks, keeping your building safe and dry.
4) Cost-Effective
The initial installation cost of a BUR might be higher than some other roofing systems, but its longevity and low maintenance costs make it a highly cost-effective choice in the long run.
5) Energy Efficiency
The reflective surface of a BUR reduces heat absorption, keeping your building cooler in summer and lowering energy bills—a win for you and your tenants.
6) Fire Resistance
The combination of bitumen and aggregate makes BUR systems highly fire-resistant, helping you ensure the safety of your property and occupants.
When Is a Built-Up Roof the Right Choice?
Built-up roofs are best suited for flat or low-slope commercial roofs. If your property handles heavy rooftop traffic, or if you’re looking for a reliable, long-lasting option, BUR is an excellent choice. It works well for:
- Office buildings
- Retail facilities
- Warehouses
- Medical centers
- Schools and universities
The 3 Step Installation Process of a Built-Up Roof
A properly installed BUR can last 20 to 30 years or more when maintained well. Here’s a quick look at what the installation process typically involves:
1. Roof Deck Preparation
Before installation, the roof deck is prepared by cleaning and inspecting for any damage. This ensures a strong foundation for the roofing system.
2. Layering Process
The roofing system is built up layer by layer:
- A base coating of bitumen is applied to the deck.
- Reinforcing ply sheets are installed over the bitumen.
- Additional layers of bitumen and ply sheets are applied, one on top of the other.
3. Surface Application
Finally, a protective surfacing layer is added. This is usually gravel, mineral granules, or a reflective coating, which offers UV protection and weather resistance.
The entire installation is done with attention to detail to ensure seamless coverage and a watertight seal.
Common Maintenance Tips for BUR
While BUR roofs are low maintenance, routine upkeep is still crucial to maximize their lifespan. Here’s what you, as a property manager, need to keep in mind:
- Inspect Regularly: Schedule professional inspections at least twice a year, ideally in the spring and fall, to identify and address any issues early.
- Clean Debris: Remove debris, leaves, or branches that could block drainage or cause damage over time.
- Check for Ponding Water: Inspect the surface for any standing water after heavy rains, as it can lead to premature deterioration.
- Patch Minor Damages: Address small cracks, punctures, or other wear and tear immediately to avoid costly repairs later.
- Monitor the Aggregate: Ensure the gravel or aggregate layer is evenly distributed, as exposed areas can compromise the roof’s protective capabilities.
By working with an experienced roofing contractor, you can create a maintenance plan that ensures your BUR continues to perform at its best.
Is a Built-Up Roof Right for Your Property?
Choosing the right roofing system is a key decision for any property manager. Built-up roofs bring a range of benefits, from reliability and energy efficiency to cost savings over time.
If you’re considering installing a BUR on your commercial property, Whitt’s Quality Roofing is here to help. Our team of roofing experts will guide you through the process, ensuring you get a roofing solution that meets your building’s unique needs while aligning with your budget.