What is a built-up roofing system?

A built-up roof (BUR) is a flat roofing system constructed from multiple alternating layers of bitumen (asphalt or coal tar) and reinforcing fabrics (fiberglass or polyester). These layers are built up on-site to create a thick, durable, seamless membrane. The system is typically finished with gravel, a cap sheet, or a reflective coating.

How does BUR compare to TPO roofing?

BUR and TPO are both excellent flat roof systems with different strengths. BUR offers superior puncture resistance, multi-layer redundancy, and a longer track record. TPO is lighter, faster to install, more reflective, and typically less expensive. The best choice depends on your building's specific needs, traffic patterns, and budget.

How long does a BUR roof last in Miami?

A properly installed BUR system in Miami typically lasts 25-30 years, with some systems exceeding 40 years. Longevity depends on the number of plies, quality of materials, installation quality, and maintenance. Regular inspections and maintenance are key to maximizing service life.

Is modified bitumen the same as BUR?

Modified bitumen is a related but distinct system. While traditional BUR is built up from individual layers on-site, modified bitumen uses factory-manufactured sheets that are pre-engineered with polymer-modified asphalt. Modified bitumen can be used as a standalone system or as the top layer (cap sheet) of a BUR assembly.

Does BUR installation create odors or fumes?

Traditional hot-applied BUR does produce asphalt odors during installation. For occupied buildings where this is a concern, we can use cold-applied BUR adhesives or torch-applied modified bitumen systems that produce significantly less odor. We discuss these options during project planning.

Can a BUR roof be re-coated instead of replaced?

If the existing BUR membrane is in sound condition without widespread blistering, delamination, or moisture infiltration, applying an elastomeric or aluminum coating can extend its life by 10-15 years at a fraction of the replacement cost. We perform core cuts and moisture tests to determine if re-coating is a viable option.

What maintenance does a built-up roof require?

BUR roofs benefit from biannual inspections, regular drain and scupper clearing, prompt repair of blisters or cracks, and resealing of flashings as needed. We offer preventive maintenance programs specifically designed for BUR and modified bitumen systems.

Commercial Roofing

Built-Up Roofing Systems for Miami Commercial Properties

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Built-Up Roofing Systems in Miami & South Florida

Built-up roofing (BUR) is one of the most time-tested and reliable flat roofing systems in the industry, with over a century of proven performance on commercial, industrial, and institutional buildings. At Extreme Roofing Inc., we install and maintain BUR systems throughout Miami-Dade County using both traditional hot-applied asphalt methods and cold-applied adhesive techniques depending on project requirements and building occupancy considerations.

A BUR system consists of multiple alternating layers of reinforcing fabric (fiberglass or polyester) and bitumen (asphalt or coal tar), creating a monolithic, multi-ply membrane that offers exceptional puncture resistance, waterproofing, and longevity. The system is typically topped with a flood coat of asphalt and a layer of gravel, a mineral cap sheet, or a reflective coating. This redundant, multi-layer construction means that even if the surface is damaged, the lower plies continue to provide waterproofing protection.

We also install modified bitumen systems -- the modern evolution of traditional BUR -- which use factory-manufactured sheets modified with SBS or APP polymers for enhanced flexibility, elongation, and UV resistance. Whether your building needs a traditional multi-ply BUR, a modified bitumen system, or a hybrid approach, our experienced crews deliver the quality installation these systems require to perform at their best in Miami's demanding climate.

Why Choose Our Built-Up Systems?

Backed by 22+ years of South Florida expertise, our team delivers results you can count on.

Multi-Layer Redundancy

Multiple plies of reinforcement and bitumen create a redundant waterproofing membrane that continues protecting even if the surface is damaged.

Outstanding Puncture Resistance

BUR systems offer the highest puncture resistance of any flat roof membrane, ideal for roofs with heavy foot traffic or equipment.

Proven 25-30+ Year Lifespan

With proper installation and maintenance, BUR and modified bitumen systems routinely deliver 25-30 years or more of reliable service.

Reflective Coating Options

Aluminum or white elastomeric coatings can be applied to the surface to improve energy efficiency and extend membrane life.

Easy to Repair

Localized damage can be patched quickly and effectively without disrupting the surrounding membrane, minimizing repair costs.

Our Process

A straightforward, transparent process from start to finish -- no surprises.

System Evaluation

We assess your building's structural capacity, drainage design, and performance requirements to specify the optimal BUR or modified bitumen system.

Deck Preparation & Insulation

The roof deck is cleaned, primed, and fitted with rigid insulation and tapered crickets to achieve positive drainage across the entire roof area.

Multi-Ply Application

Alternating layers of reinforcement and bitumen are applied using hot-mopping, torch-down, or cold-adhesive methods depending on the specified system.