Lifespan
20-30 years
Cost
$$
Durability
Energy Efficiency
Fire Rating
Class A
Maintenance
Built-up roofing is the grandfather of commercial flat roofing — and it’s still going strong. For over 100 years, BUR systems have protected warehouses, retail centers, and commercial buildings. The multi-layered approach to waterproofing remains one of the most reliable systems available.
A BUR system is built in layers, alternating between hot asphalt and sheets of reinforcing fabric (typically fiberglass). Each layer adds waterproofing and structural integrity. The result is a monolithic membrane that’s highly resistant to punctures, tears, and water intrusion.
The gravel surface on a traditional BUR roof isn’t just aesthetic — it serves three critical functions. It protects the asphalt from UV degradation, provides ballast against wind uplift, and adds a significant fire resistance rating to the assembly.
Today’s BUR systems benefit from decades of material science improvements. Fiberglass reinforcing has replaced organic felts, cold-applied adhesives offer an alternative to hot asphalt, and reflective coatings can be applied to meet modern energy codes. The fundamental technology is proven — the materials just keep getting better.
Installation Process
At a Glance
Advantages
Proven system — over 100 years of performance history
Multi-ply design provides excellent waterproofing redundancy
Gravel surface provides fire resistance and UV protection
Excellent foot traffic resistance
Long lifespan when properly maintained
Considerations
Heavy — requires strong structural support
Installation produces fumes from hot asphalt
More labor-intensive than single-ply systems
Leak detection can be difficult in multi-ply systems
Key Features
Multi-Ply Construction
Three to four alternating layers of asphalt and reinforcing fabric create a monolithic waterproof membrane with built-in redundancy.
Gravel Ballast
Embedded gravel protects the membrane from UV degradation, provides fire resistance, and adds weight to resist wind uplift.
Smooth Coat Option
For a cleaner look and easier maintenance, a smooth asphalt flood coat with reflective coating can replace traditional gravel.
Cold-Applied Systems
Modern cold-applied adhesives eliminate the need for hot kettles, reducing fumes and fire risk during installation.
Project Gallery
Multi-ply BUR system being installed on a commercial building
Gravel ballast providing UV protection and fire resistance
Finished built-up roof with smooth flood coat
Years in Business
Owens Corning Nationwide
Google Rating
Licensed & Insured
FAQs
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