BUilt Up and SBS
Roofing System
SBS modified bitumen roofing (Styrene-Butadiene-Styrene) is a system composed of asphalt and synthetic rubber. As a modern version of the BUR (Built Up Roof) roofing method, the SBS rubber composition material is used on low slope flat roofs and is trusted to perform exceptionally well against extreme weather conditions. Opposed to other lightweight membranes that are more susceptible to winds and movement, an SBS system moves with the building.
Installation:
SBS can be installed using cold apply, heat welded, self-adhered, mechanically fastened, or hot application methods. Prior to installation, an insulation will be installed between the roof deck and the SBS membrane.
Cold Apply SBS –Cold adhesives along with flashing cements, plastic cements and primers are all asphalt products that bond to the modified bitumen surface of the membrane by a type of solvent weld. This type of application has a low odor and has limited handling precautions when installed over occupied buildings.
Heat Welding SBS – SBS heat applied membranes utilize a heat welder or torch to bond the SBS together making it theoretically impossible to separate the seams of the SBS membraned
Self-Adhesive SBS – When the application options are limited due to odor, open flame or regulation on volatile organic compounds, self-adhesive applications can be used. This method is fast, requires few tools and leaves little mess relative to other applications. However, there are low temperature limitations as thermal cycles and solar heating help to bond membranes.
Mechanical Fastening SBS – This process is best used in high-wind zones to attain some of the highest wind-uplift resistance values. Additionally, mechanically fastened SBS allows for the removal of coverboard from the system, saving time and money.
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The Benefits of a SBS Modified Bitumen Roofing System
- Higher elongation allowing the membrane to move with the natural expansion of the roof components.
- Increased elasticity
- Low temperature flexibility
- High temperature resistance
- Better adhesive properties
- High UV-resistance / durability
Warranties:
All WNC Roofing’s SBS roof installations come with a 20-year manufacturer’s warranty that stands behind the integrity of the product. WNC Roofing adheres to the manufacturer’s installation requirements to maintain the 20-year warranty for all roofs we install.
A post-installation inspection is conducted by the manufacturer following each of WNC Roofing’s projects before a final sign-off for the 20-year warranty is approved. Additionally, WNC Roofing provides a two-year workmanship warranty to cover all installation aspects.
Traditional Built Up Roofing
Built-Up Roofing (BUR) is a type of commercial roofing system made from multiple layers of bitumen (asphalt or coal tar) and reinforcing fabrics. These layers are applied in alternating sequences to create a durable, waterproof membrane. BUR systems are also referred to as “tar and gravel” roofs due to their traditional appearance, often featuring a gravel or stone layer on top for protection.
BUR systems are known for their long lifespan. When installed properly and maintained, they can last between 30 to 40 years or even longer. The longevity depends on factors such as the quality of materials, installation technique, and the severity of local weather conditions. Regular inspections and maintenance (such as removing debris and checking for damage) can help extend the life of the roof.
Overall, Built-Up Roofing is a reliable option for commercial buildings, especially for low-slope or flat roofs, offering a strong and durable solution with the potential for long-term performance.
The Benefits of a BUR Roof
- Durability: BUR is highly durable and can withstand harsh weather conditions, such as heavy rain, snow, and extreme heat.
- Waterproofing: The multiple layers of bitumen and fabric provide excellent waterproofing protection, making it ideal for flat roofs or low-slope applications.
- Energy Efficiency: The reflective surface of BUR systems (if coated with reflective granules or coatings) can help reduce cooling costs by reflecting sunlight.
- Low Maintenance: Once properly installed, BUR roofs require minimal maintenance, especially if the gravel layer is intact and the roof remains free of debris.
- Long Lifespan: When well-maintained, BUR systems can last for several decades, often up to 30-40 years or more.
The Cons of a BUR Roof
- Installation Cost: BUR systems tend to have a higher initial installation cost due to the materials and labor-intensive process.
- Weight: The multiple layers can make BUR roofs quite heavy, requiring a strong roof structure to support the weight.
- Odor: The asphalt or coal tar used in BUR can produce strong odors during installation, which may be unpleasant for nearby occupants.
- Labor-Intensive Installation: BUR installation can be a lengthy process, and it typically requires skilled labor, which can increase costs.
- Vulnerability to Punctures: While BUR is durable, the surface can still be susceptible to punctures or damage from sharp objects or extreme impacts.
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