When it comes to choosing the best roofing system for your commercial building, understanding the differences between various options is crucial. Two popular choices are Built-Up Roofing (BUR) and Thermoplastic Polyolefin (TPO) roofing. While both systems offer unique benefits, they also have their own set of challenges. This comparison will help you determine which option is best suited for your specific needs.
Differences Between Built-Up Roofing and TPO
1. Composition and Structure
- TPO Roofing: TPO is a single-ply membrane roofing system made from a blend of polypropylene and ethylene-propylene rubber. It comes in large sheets that are either mechanically attached or fully adhered to the roof deck.
- Built-Up Roofing (BUR): BUR, on the other hand, is a multi-layer system that has been used for over a century. It consists of alternating layers of bitumen (asphalt or coal tar) and reinforcing fabrics, creating a durable and waterproof membrane.
2. Installation Methods
- TPO Installation: TPO membranes are typically installed by adhering them to the roof deck with bonding adhesives or mechanical fasteners. The seams are heat-welded to create a watertight seal.
- BUR Installation: BUR systems are applied in layers using hot asphalt, cold process adhesives, or torch-applied bitumen. The system is often finished with a layer of gravel or a cap sheet to enhance durability and UV protection.
Pros and Cons of Built-Up Roofing Systems
Pros:
- Excellent Waterproofing: Multiple layers provide redundancy, ensuring a highly waterproof surface.
- Durability: BUR systems are known for their ability to withstand harsh weather conditions and heavy foot traffic.
- Fire Resistance: The gravel surface or cap sheet provides additional protection against fire.
- UV Protection: The surface layer helps protect the roof from UV degradation, extending its lifespan.
Cons:
- Weight: BUR systems are heavier than single-ply membranes, which may require additional structural support.
- Installation Time: The installation process is more labor-intensive and time-consuming compared to TPO systems.
Pros and Cons of TPO Roofing Systems
Pros:
- Lightweight: TPO membranes are much lighter than BUR systems, putting less strain on the building’s structure.
- UV Resistance: TPO surfaces reflect up to 87% of UV rays, making them ideal for hot climates.
- Flexibility: TPO remains flexible in cold temperatures, reducing the risk of cracks and other weather-related damage.
- Chemical Resistance: TPO is resistant to a wide range of environmental pollutants and chemicals.
Cons:
- Foot Traffic: TPO roofs are more susceptible to damage from foot traffic compared to BUR systems.
- Installation Precision: Proper installation is critical for TPO membranes; otherwise, seams may become a weak point, leading to leaks.
Which Roofing System Should You Choose?
Choosing between Built-Up Roofing and TPO largely depends on your building’s specific needs and the environmental conditions it faces.
- For buildings in high-traffic areas: BUR may be the better option due to its durability and ability to withstand foot traffic.
- For buildings in hot climates: TPO is often preferred for its superior UV resistance and energy efficiency.
- For older buildings: TPO can often be installed over existing roofing systems, saving on tear-off costs and reducing installation time.
Trust G. Fedale Roofing for Expert Advice
At G. Fedale Roofing, our experienced professionals can help you decide which roofing system is best for your commercial building. With years of experience in both Built-Up Roofing and TPO installations, we ensure your roof is installed correctly and maintained to the highest standards.
Serving Malvern, PA, and Beyond
Whether your building is in Malvern, PA, or the surrounding areas, G. Fedale Roofing is committed to providing top-quality roofing solutions tailored to your needs. Contact us today to schedule a consultation or a comprehensive roof inspection.