What is Built Up Roofing?

Built-Up Roofing is one of the oldest and most reliable types of commercial roofing systems. It involves the application of multiple layers of tar and gravel. Each layer of BUR is made up of bitumen, which is either asphalt, coal tar, or a cold-applied adhesive. These bitumen layers are alternated with layers of reinforcing fabrics called roofing felts or ply sheets, which are made from fiberglass or organic materials. The top layer of a BUR system typically consists of stone or gravel, which serves several purposes, from protecting the underlying layers to providing UV protection and enhancing the roof’s aesthetic appearance.

Benefits of Built Up Roofing

1. Durability and Longevity
   • BUR systems are exceptionally durable. The multiple layers make these roofs highly resistant to water, weather, and mechanical damage. When properly installed and maintained, a BUR can last up to 30 years or more.
2. Waterproofing Excellence
   • The seamless nature of BUR, thanks to its layered construction, provides superior waterproofing capabilities. This makes it an ideal choice for regions that experience heavy rainfall or snow.
3. Thermal Performance
   • The thickness and mass of BUR provide excellent insulation properties. This helps in regulating the building’s temperature, leading to reduced energy costs for heating or cooling, particularly in extreme weather conditions.
4. Fire Resistance
   • BUR materials can be made to be highly fire-resistant. This is particularly important for industrial settings where fire risk may be higher, providing an added layer of security and reducing insurance premiums.
5. Cost-Effectiveness
   • While the initial installation cost of a BUR system may be higher compared to some other roofing types, its longevity and durability translate into a lower total cost of ownership over the life of the roof. Fewer replacements and repairs are needed, which is economically beneficial in the long run.
6. Proven Track Record
   • BUR systems have a proven track record of performance in protecting commercial and industrial buildings. Their long history and widespread use are a testament to their reliability and effectiveness in a variety of climates and building types.