Built-Up Roofing (BUR) consists of multiple layers of bitumen alternated with ply sheets (felts) applied over the roof deck, vapor retarder, and (most often) insulation.
BUR roofing systems are particularly advantageous for flat or low-sloped applications. The heart of the system is the membrane which includes the layers of bitumen, which is applied hot, and the reinforcing plies of roofing felt.
With today’s technological advances in asphalt science, cold bitumen adhesives can be used in lieu of hot asphalt.
Built-Up Roofs Offer:
- Multi-Layer Protection — the multiple layers of bitumen and bitumen saturated “felts” make a water-resistant barrier capable of providing many years of reliable protection from the elements
- Thermal Performance — Built-up roofing systems exhibit exceptional resistance to the conduction of heat between the exterior and interior of a building, resulting in noticeable reductions in heating and cooling costs.
- Fire and Uplift Resistance — Built-up roofing systems are tested through Underwriters Laboratories and Factory Mutual Research Corporation to meet very strict fire resistance requirements and ensure adequate uplift
resistance under extreme wind conditions.
- Economy — Compared to other high performance commercial roofing systems, built-up roofing is one of the best investments on the market due to its competitive cost per year of expected service life.