Built-Up Roofing (BUR) systems are one of the oldest and most reliable roofing solutions used on commercial and industrial buildings. Known for their durability, weather resistance, and layered protection, BUR roofs continue to be a trusted option for flat and low-slope roofs across North America.
In this guide, we’ll cover what a built-up roof is, how it works, its key benefits and drawbacks, and how professional roof vacuuming services from Adler Hydro Vac help extend the life of BUR systems.
A Built-Up Roofing (BUR) system is a multi-layered flat roofing system made by alternating layers of bitumen (asphalt or coal tar) and reinforcing fabrics, finished with a protective top surface.
Often referred to as a “tar and gravel roof,” BUR systems have been used for over a century and are especially common on:
The multiple layers create a thick, durable membrane designed to withstand harsh weather, foot traffic, and long-term exposure.
BUR systems rely on redundancy and layering to protect a building from water infiltration and environmental damage.
Each layer works together to form a seamless waterproof barrier. If one layer is compromised, the others continue to protect the roof—one of BUR’s greatest strengths.
1. Proven Durability. BUR systems can last 20–30 years or more with proper installation and maintenance.
2. Excellent Waterproofing. Multiple layers provide superior resistance to leaks compared to single-ply systems.
3. UV & Weather Resistance. The gravel or coated top layer protects against ultraviolet rays, hail, and extreme temperatures.
4. Fire Resistance. BUR roofs often have strong fire ratings, especially gravel-surfaced systems.
5. Low Maintenance Over Time. When regularly inspected and cleaned, BUR roofs require fewer major repairs.
While BUR systems are reliable, they are not without challenges:
Weight
Installation Time & Odors
Drainage Sensitivity
Maintenance Is Essential
Debris accumulation—such as gravel displacement, leaves, dirt, and standing water—can lead to:
This is where professional roof vacuuming services become critical.
Adler Hydro Vac specializes in professional roof vacuuming services designed to protect and extend the life of BUR systems without causing damage.
Benefits of Roof Vacuuming for BUR Roofs
Safe Debris Removal
Unlike brooms or blowers, vacuuming removes debris without disturbing the gravel surface or membrane layers.
Improved Drainage
Clearing debris from drains, scuppers, and roof surfaces helps prevent ponding water and leaks.
Extended Roof Lifespan
Regular vacuuming reduces surface wear, moisture retention, and membrane stress.
Preventative Maintenance
Identifying problem areas early helps avoid costly repairs or premature replacement.
Ideal for Commercial Properties
Adler Hydro Vac’s non-invasive approach is well-suited for occupied buildings, warehouses, and sensitive facilities.
Built-Up Roofing systems remain a time-tested solution for flat and low-slope commercial roofs. Their layered construction provides durability, waterproofing, and long-term value—but only when paired with proper maintenance.
By combining routine inspections with professional roof vacuuming services from Adler Hydro Vac, property owners can protect their investment, improve drainage performance, and significantly extend the life of their BUR system.
