DFW Commercial Roofing
Modified Bitumen & Built-Up Roofing — Texas & Dallas–Fort Worth
Built-up roofing (BUR) and modified bitumen systems represent some of the most proven commercial flat roofing technologies available — systems with multi-decade track records across a wide range of commercial property types. In the Dallas–Fort Worth market, BUR and modified bitumen are particularly prevalent on commercial buildings constructed before TPO became dominant, meaning a significant portion of the metro's older industrial, retail, and commercial stock relies on these systems. Many property managers in DFW are making replacement decisions on BUR and modified bitumen roofs that have reached or exceeded their design life.
BUR and Modified Bitumen System Types
- Traditional built-up roofing (BUR) — Multiple alternating layers of bitumen (asphalt or coal tar) and reinforcing fabric, topped with aggregate surfacing. The most redundant waterproofing system available. Common on older DFW commercial buildings from the 1960s–1990s.
- SBS modified bitumen — Styrene-butadiene-styrene polymer-modified bitumen. More flexible and elastic than traditional BUR; better cold-temperature performance; can be torch-applied, cold-applied, or self-adhered. Common on DFW commercial properties from the 1980s–2010s.
- APP modified bitumen — Atactic polypropylene polymer-modified bitumen. Higher heat resistance than SBS; more common in torch-applied applications. Suitable for Texas heat conditions.
- Hybrid systems — Modified bitumen cap sheet over BUR base plies. Combines the redundancy of multi-ply BUR with the durability and surfacing options of modified bitumen cap sheets.
BUR and Modified Bitumen Performance in Texas
Traditional BUR systems perform reliably in the Texas climate but require more active maintenance than membrane systems. The multi-ply construction provides excellent redundancy — a single-ply membrane failure allows immediate water entry, while BUR systems typically contain water infiltration even when the surfacing layer is compromised. However, BUR's aggregate surfacing can retain heat in Texas summer conditions, and UV exposure accelerates asphalt oxidation in the high-sun-angle DFW environment.
Modified bitumen systems address many of BUR's limitations — they are lighter, easier to install and repair, and offer better elastomeric performance across temperature extremes. SBS modified bitumen systems are particularly well-suited to Texas conditions when properly specified, providing flexibility at both summer high and winter low temperatures.
Common BUR and Modified Bitumen Repair Needs in DFW
- Blistering and delamination — Trapped moisture between plies creates blisters that eventually rupture. Blister repair involves cutting, drying, and re-bonding the affected area with compatible hot-applied or cold-applied materials.
- Surface alligatoring — UV oxidation and aging of bituminous surfaces creates a cracked, alligator-skin pattern. Surface alligatoring indicates advanced aging but does not immediately compromise waterproofing — it signals the need for inspection and assessment of remaining service life.
- Granule loss on modified bitumen cap sheets — Hail events and UV degradation remove granule surfacing from modified bitumen cap sheets, accelerating bitumen oxidation. Granule loss is both a maintenance concern and an insurance claim indicator after significant hail events.
- Flashing failures — Perimeter flashings, pitch pockets, and penetration flashings on BUR systems deteriorate over time and are common leak sources. Re-flashing with compatible materials extends the life of otherwise serviceable BUR systems.
BUR and Modified Bitumen Cost Ranges in Texas
| Service | Typical Range | Notes |
|---|---|---|
| BUR / Mod Bit Inspection | No charge | Through our contractor network |
| Blister / Patch Repair | $400 – $2,000 | Individual blister and localized repairs |
| Flashing Re-work | $500 – $4,000 | Perimeter, penetrations, pitch pockets |
| BUR Section Repair | $2,000 – $15,000 | Larger section replacement within existing system |
| Mod Bitumen Replacement | $4.00 – $9.00 / sq ft | 2-ply SBS cap and base system |
| Full BUR Replacement | $5.00 – $11.00 / sq ft | Multi-ply hot-applied or cold-applied system |