Understanding PVC Roofing
Polyvinyl Chloride (PVC) roofing, a material comprised of chlorine and ethylene, stands as a prominent choice for low-slope and flat roofing projects. Its unique composition, derived from natural gas or processed salt, lends it distinct characteristics. PVC roofing is installed either mechanically, using plates and special screws, or through a bonding adhesive, such as in the Fleece Back roof system. The seams of PVC roofs are heat-welded, a technique that ensures robust seam integrity.
The Benefits of Choosing PVC Roofing
Color Diversity and Aesthetic Appeal
PVC roofing is not limited to the conventional white; it is available in a spectrum of colors including gray and tan. This variety allows for aesthetic flexibility, catering to diverse architectural styles and personal preferences.
Enhanced UV Resistance
The high UV resistance of PVC, particularly in its white variant, reflects sunlight effectively. This characteristic not only reduces cooling costs in warmer climates but also mitigates the urban heat island effect.
Superior Fire Resistance
PVC roofing meets the requirements of a Class A fire rating. It contains special chemicals that enable it to act as a self-extinguisher, offering a higher degree of fire resistance compared to other materials like TPO.
Varied Thickness for Customization
Available in thicknesses ranging from 40 to 80 mils, PVC roofing provides options to suit different durability and budget requirements.
Puncture and Tear Resistance
PVC’s resistance to punctures and tears is noteworthy. It has successfully withstood significant hail impact, earning a Class 4 hail damage rating.
Chemical Resistance
PVC’s ability to resist chemicals such as grease and oil makes it an ideal choice for buildings like fast-food restaurants, where such substances are prevalent.
Cost-Effectiveness
While PVC is more affordable than TPO, it offers a competitive price point compared to EPDM, typically ranging between $75 to $250 per square, excluding installation costs.
Longevity
With a life expectancy of 20 to 30 years, PVC roofing is on par with other high-quality roofing materials like asphalt shingles.
Wind Resistance
PVC roofing is known for its excellent wind uplift resistance, capable of withstanding winds equivalent to those in category 3 hurricanes (110 mph to 130 mph).
Recyclability
PVC is an environmentally conscious choice, being fully recyclable. Old PVC roofs can be repurposed into new roofing materials, shipping materials, picture frames, or even athletic fields.
Strength and Lightweight Nature
With a break strength of approximately 300 lbs per square inch, PVC boasts remarkable durability. Its lightweight nature simplifies installation and reduces structural load.
Versatility and Flexibility
PVC’s flexibility makes it suitable for both commercial and residential applications, including flat and low-slope roofs. This versatility is a significant advantage over materials like TPO.
Temperature Adaptability
PVC can be installed in a wide range of temperatures, as long as conditions are above 58°F. Its heat-welded seams remain effective even in colder climates, ensuring a durable and watertight seal.
The Drawbacks of PVC Roofing
Environmental Concerns
PVC production and disposal can release harmful chemicals, including dioxins, which pose risks to human health and the environment.
Installation Requirements
PVC requires a clean, smooth surface for installation. Any debris or irregularities can lead to punctures or leaks. Additionally, existing roofing must be completely removed before PVC installation, adding to labor costs.
Performance in Extreme Cold
In very cold environments, PVC can become brittle and susceptible to cracking or shattering, especially under foot traffic.
Conclusion
PVC roofing, with its array of benefits like chemical resistance, fire safety, and durability, is an excellent choice for a variety of roofing needs. While it has some limitations, its advantages often outweigh the drawbacks, making it a preferred option for many applications. For those in Glens Falls, NY, Benson Contracting offers expert advice and installation services for PVC roofing, ensuring that your roofing choice meets your specific needs and lasts for years to come.
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