Built-Up Roofing (BUR) is one of the oldest and most reliable and durable commercial roofing systems for buildings with low-slope or “flat” roof structures. Often referred to as “tar and gravel” roofs, BUR consists of multiple layers (plies) of roof felts laminated together with bitumen or asphalt. BUR consists of bitumen-saturated organic-fiber, fiberglass, or polyester felt with a top-surface of asphalt, aggregate (gravel or slag), fiber, or non-fiber coatings engineered for roof coating, or a granule-surfaced cap sheet.
Built-up roofs can be designed and specified to meet a broad range of building waterproofing applications, depending on the needs of the building owner. BUR is especially resistant to damage from wind, hail and snow. They are easy to repair and ideally suited for applications requiring a high level of redundancy.
Among the advantages of Built-up Roofing Systems:
- BUR surfacing materials can be coated with paint or other reflective materials to reduce the effects of UV radiation. These coatings provide the additional benefit of reducing cooling and heating costs.
- Proven track record of performance
- Broad range of application methods
- Available as part of a fire, wind, and/or hail rated roofing system
- Wide choice of top-surfacing, including “Cool Roofing” options
- With insulation, provides an even better-performing building component
- Superior waterproofing characteristics
- High tensile-strength
- Competitive life-cycle cost
- Long-term warranties are available with many BUR systems