Built-up roofing, known commonly in the industry under the acronym BUR, is also referred to as hot tar roofing. This type of roofing has been in use for more than 150 years, so we know that it does an excellent job of protecting buildings. In fact, it is one of the strongest roofs available right now.
Commercial built-up roofing (BUR) systems are a staple in the roofing industry, particularly for flat and low-slope roofs found in commercial and industrial buildings. These systems are renowned for their durability, longevity, and ability to withstand harsh weather conditions. Let’s delve deeper into what makes BUR systems a preferred choice for commercial applications.
BUR consists of bitumen layered with a reinforced fabric to create a membrane that protects and seals in the building securely. There are several different types of bitumen and fabrics used, and the best one varies from building to building. The most common type of bitumen used in BUR is asphalt bitumen or cold-applied adhesive. Asphalt is heated up and then applied by a spreader. Cold-applied adhesives do not have to be heated before they are applied. The types of surfacing that are commonly used include gravel, mineral surfaced or glass fiber sheets, aluminum coatings, hot asphalt, or elastomeric coatings.
How does BUR Roofing work?
The installation of a BUR system involves mechanically fastening the base sheets to the deck, then installing felts with the bitumen material, alternating layers of fabric and bitumen. The surface is a cap sheet of bitumen or a flood coat then an additional layer of gravel or some other type of coating.
One of the most popular options in Arizona is the cool roof application, which is a BUR system that delivers high solar reflectance. With this type of building, business owners experience immediate and long term savings in energy costs. A cool roof cuts down on building heat gain by reducing the temperature the roof will reach during the day. It also extends the life expectancy of the roof membrane, especially under the hot sun. In addition, it cuts down on air pollution.
Components of Built-up roofing Systems
Roof Deck: The structural base of the roof, which can be made from materials such as wood, steel, or concrete. The roof deck provides the foundation for the entire roofing system.
Roof Insulation: Placed over the roof deck, insulation is crucial for enhancing energy efficiency. It helps maintain consistent indoor temperatures, reducing heating and cooling costs.
Ply Sheets: These are layers of reinforcing materials such as roofing felts, fabrics, or mats. Ply sheets are the primary structural component, providing strength and flexibility to the roofing system.
Cap Sheet: The top layer that provides additional protection and aesthetic appeal.
Bitumen (Hot Asphalt): Used as the adhesive to bond the ply sheets together, bitumen ensures waterproofing and adds to the overall durability of the roof.
Flood Coat: An additional layer of bitumen to secure the aggregate or mineral surface.
Insulation Fasteners: Secure the insulation to the roof deck.
Applications of Built-up roofing
Built up roofs systems are particularly suitable for low-slope roofs commonly found on commercial and industrial buildings. The ability to cover large roof surface areas efficiently makes BUR an ideal choice for warehouses, factories, and office buildings.
Installation Process
The installation of a BUR system involves:
Preparing the roof deck to ensure it is clean and free of debris.
Applying layers of roof insulation to improve thermal performance.
Sequentially installing ply sheets with alternating layers of hot asphalt.
Finishing with a cap sheet or a flood coat and aggregate for added protection and durability.
System Performance and Maintenance
A well-installed BUR system provides long-lasting performance. Regular maintenance, including inspections and repairs of any damage to the roof surface, ensures the longevity of the roof. Built up roofs systems can be repaired relatively easily compared to other roofing systems, making them a cost-effective option over time.
Built-up roofing systems offer a reliable, durable, and energy-efficient solution for flat roofs in commercial and industrial settings. With their multiple layers of protection and exceptional resistance to various elements, BUR systems continue to be a preferred choice for roofing professionals and building owners alike.
The Advantages of BUR
There are many reasons BUR roofing may be the best option for your business. BUR roofing is a multi-ply roof, which basically means that there are multiple layers applied over top of each other. As you can imagine, there are many advantages to be enjoyed by opting for a roof with multiple layers, including:
- It creates a monoliphic watertight barrier that can protect for many years.
- Even if the top layer becomes damaged for any reason, the layers underneath it continue to protect.
- A BUR system does not expand and contract as much as other types of roofing, which means it is less prone to buckling, splits, and ridges.
- No fasteners are needed in the top layers, which is important because fasteners create a place for water to seep in if they are not attached properly.
- Multiple layers are much more durable and stable, making it the perfect place for mechanical systems, solar panels, roof gardens, or roof decks.
- The incorporation of roofing insulation into the membrane brings a higher R value and better insulation against the hot Arizona sun.
- BUR roofing has the highest fire rating available in the industry.
- BUR can be coated with reflective material to create a cooler roof and protect against UV rays.
- Built-up roofing system is extremely low maintenance, requiring just an annual inspection to check for clogged drains, gutters, or pitch pockets.
- If the top layer becomes damaged, it’s easy and economical to patch the top layer.
Built-Up Roofing Experts
Overson Roofing is a reputable roofing company based in Phoenix, Arizona, known for its commitment to quality and customer satisfaction. Serving the Phoenix metropolitan area, Overson Roofing offers a comprehensive range of services including roof repair, replacement, and maintenance for both residential and commercial properties. With a team of highly skilled and experienced professionals, the company ensures top-notch workmanship and uses high-quality materials to deliver durable and reliable roofing solutions. Overson Roofing is dedicated to providing excellent service, ensuring that each project is completed efficiently and to the highest standards.
At Overson Roofing, we have the knowledge and the experience necessary to help business owners determine which type of built-up roofing system is best for their building. All materials are covered by the manufacturer’s warranty, and all work is guaranteed by our own warranty.
Let us help you make the best choice for your business and then help you maintain it through the years. With proper maintenance, a built-up roof should last between 15 and 25 years, depending on whether it is a 3-, 4-, or 5-ply roof.
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