Built-Up Roof

Definition

A built-up roof (BUR) is a roof covering made of continuous rolls or sheets of saturated or coated felt, cemented together with bitumen, and often finished with a final coating of gravel or slag.

Purpose

Built-up roofs are designed to provide a durable and weather-resistant roofing solution, primarily for flat or low-slope roofs. The multiple layers of felt and bitumen create a strong, waterproof membrane that protects the building from water infiltration and environmental damage.

Examples of Use

1. Commercial Buildings: BUR systems are commonly used on the flat roofs of commercial buildings due to their durability and long lifespan.
2. Industrial Facilities: Factories and warehouses often employ BUR systems for their ability to withstand harsh weather conditions and heavy foot traffic.
3. Residential Buildings: Some residential buildings with flat or low-slope roofs use BUR for its reliable waterproofing capabilities.

Related Terms

• Bitumen: A sticky, black, and highly viscous liquid or semi-solid form of petroleum used in the construction of built-up roofs.
• Gravel: Often used as a final coating on BUR systems to protect the underlying layers from UV radiation and physical damage.
• Felt: A type of fabric used in roofing, saturated with bitumen to make it waterproof and durable.

Notes

Proper installation of a BUR system requires skilled labor to ensure that all layers are correctly applied and sealed. Regular maintenance and inspections are necessary to address any wear and tear, especially in areas exposed to heavy weather or foot traffic.