Built-up roofing (BUR) is renowned for its exceptional durability, making it a popular choice for flat and low-slope roofs. Composed of multiple layers of asphalt, felt, and gravel or other protective materials, BUR systems create a robust barrier against environmental elements. This multilayer construction not only enhances resistance to water penetration and UV radiation but also provides excellent thermal insulation.
Built-up roofs offer multiple layers of protection, ensuring that if the top layer is compromised, the underlying layers remain intact to safeguard the building against water intrusion.
Thermal insulation in built-up roofing (BUR) is essential for enhancing energy efficiency by reducing heat transfer between the roof and the interior of a building. This insulation helps maintain a stable indoor temperature, minimizing the need for heating and cooling, which can lead to significant energy savings. Additionally, effective thermal insulation in BUR systems contributes to the overall comfort of the space while protecting against temperature extremes and prolonging the lifespan of the roofing materials.
This foundational layer is installed over polyisocyanurate (polyiso) insulation or a cover board, serving as the primary waterproofing barrier. It is typically secured with mechanical fasteners, hot asphalt, or cold-applied adhesives.
Acting as the middle layer, these reinforcing felts enhance insulation and flexibility. They can be attached using either hot or cold bitumen, showcasing the versatility of built-up roofing.
Available in hot or cold forms, bitumen can be coal tar, hot asphalt, or cold-applied adhesive. This asphalt-based material is known for its durability and creates a strong bond between the layers. Adding to Built Up Roofings Water Resistance.
Various surfacing materials, such as gravel, mineral cap sheets, or protective coatings, can be applied based on your preferences and the building’s needs. These materials help shield against UV damage and environmental elements.
Thermal Efficiency is a massive benefit of Built-Up Roofing. The use of multi-ply layers creates layers of exterior and interior protection, creating higher R value for better thermal performance.
BUR systems can include reflective surfacing or coatings that help reduce the heat absorption from the sun. This results in lower indoor temperatures, reducing the need for air conditioning and lowering energy costs, especially in warm climates.
The multi-layer construction of BUR systems creates a seamless, waterproof membrane, which helps prevent air leaks and thermal bridging. Additionally, FM1 Class 1 and UL Class A, which many BUR systems meet, are the highest roof assembly fire ratings available.
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