When it comes to choosing the right roofing system for your flat roof, there are several options available. Two popular choices are built-up roofing (BUR) and modified bitumen roofing. While both options are suitable for flat roofs, they have distinct differences in terms of materials, installation process, and performance. Always contact an expert roofing contractor before choosing any roofing system for your flat roof. In this article, we will explore the key differences between built-up roofing and modified bitumen roofing to help you make an informed decision.

Built-Up Roofing (BUR)

Built-up roofing, also known as "tar and gravel" roofing, has been a reliable choice for flat roofs for over a century. It is composed of multiple layers of bitumen and reinforcing materials, such as fiberglass or organic felts, alternated with layers of bitumen and a top layer of gravel or mineral granules for protection.

Installation Process

Installing a built-up roof requires skilled labor and specialized equipment. The process involves heating the bitumen to a liquid state and applying it to the roof surface in layers. The reinforcing materials are then embedded into the hot bitumen.

Benefits

Built-up roofing offers several advantages:

1. Proven Performance: Built-up roofing has a long track record of durability and reliability. It can withstand heavy foot traffic and is resistant to punctures and tears.
2. Fire Resistance: The multiple layers of bitumen and reinforcing materials provide excellent fire resistance, making built-up roofing a safe choice for flat roofs.
3. Insulation: The multiple layers of bitumen and insulation materials offer good thermal insulation, helping to regulate indoor temperatures and reduce energy costs.

Modified Bitumen Roofing

Modified bitumen roofing is a modern evolution of built-up roofing. It consists of reinforced bitumen sheets that are typically rolled out onto the roof and adhered using hot asphalt, torch-down method, or cold-applied adhesives. The bitumen sheets are usually modified with polymers or rubber to enhance their performance.

Installation Process

Modified bitumen roofing offers more flexibility in installation methods. It can be installed using a torch-down method, where the bitumen sheets are heated with a torch to adhere them to the roof surface. Alternatively, it can be installed using a cold-applied adhesive or hot asphalt.

Benefits

Modified bitumen roofing offers several advantages:

1. Flexibility: The addition of polymers or rubber to the bitumen gives modified bitumen roofing enhanced flexibility, making it more resistant to cracking and thermal stress.
2. Ease of Installation: Modified bitumen roofing is relatively easy to install compared to built-up roofing. It offers a variety of installation methods, allowing contractors to choose the most suitable option for the project.
3. Longevity: Modified bitumen roofing has a long lifespan, typically ranging from 20 to 30 years. With proper maintenance, it can provide reliable protection for your flat roof.

Conclusion

Choosing between built-up roofing and modified bitumen roofing for your flat roof depends on your specific needs, budget, and preferences.

Contact us today at 553 Prospect Avenue Brooklyn NY 11215 (646)-838 0441 https://www.nyroofing.com for your quality roofing services.