PVC (polyvinyl chloride) roofing is a single-ply white membrane widely used in both commercial and residential roofing applications. Though it has a long-standing presence in the roofing industry, PVC roofing is primarily favored for commercial projects. Its durability, weather resistance, and energy efficiency make it a viable option for residential roofing as well, where it can offer significant benefits, particularly in terms of insulation and reflective properties.
What Does PVC Roofing Stand For?
The acronym “PVC” stands for polyvinyl chloride, a type of plastic known for its affordability and resilience. PVC roofing membranes are characterized as a single-ply solution, making them suitable for a range of roofing projects, including commercial buildings and, in some instances, residential homes. This versatility, combined with its cost-effectiveness, has contributed to its popularity among contractors and property owners alike.
What Is PVC Roofing Made Of?
PVC roofing membranes consist of four distinct layers, each designed to enhance the durability and longevity of the roofing system:
- Top PVC Layer
- Reinforcement Layer (Scrim)
- Bottom PVC Layer
How Long Has PVC Roofing Been Around?
The first known PVC roofing membrane was formulated in 1966 by a German company called Trocal. The roofing industry quickly recognized PVC’s superior performance over other flat roofing systems, leading to its rapid adoption. Within a decade, PVC roofing membranes were being produced in the United States rather than imported from Europe. However, early U.S. manufacturers made formulation errors in a bid to reduce costs, which affected the membranes’ performance. Since those initial challenges, advancements have led to the development of reliable and long-lasting PVC roofing systems, making them the preferred choice for many roofing applications today.
What Goes Under PVC Roofing System?
A comprehensive PVC roofing system consists of several layers, each serving a specific role in the roof’s overall performance.
- Roof Decking
- Vapor Barrier (Optional)
- Insulation
- Cover Board (Optional)
What Colors Does PVC Roofing Come In?
While a majority of PVC roofing installations feature white materials designed to reflect sunlight, they are also available in a variety of colors. Alternative options such as gray, tan, brown, red, and green can be chosen to suit aesthetic preferences or specific project requirements.
How Thick Is PVC Roofing?
PVC roofing membranes are manufactured in various thicknesses, typically ranging from 40 mil (0.04 inches) to 90 mil (0.09 inches). The most common thicknesses are 60, 80, or 90 mil. Thicker membranes, such as the 80 or 90 mil options, offer increased resistance to punctures and tears, making them particularly suitable for high-traffic areas or harsh environmental conditions.
What Is The Life Expectancy Of A PVC Roof?
PVC roofing is renowned for its resilience and resistance to environmental factors, boasting a life expectancy of 20 to 30 years. This longevity can be significantly enhanced with proper maintenance and care. Key factors such as installation quality, climate, and ongoing upkeep are crucial in maximizing the lifespan of a PVC roof, thereby making it a valuable long-term investment for property owners.
Is PVC Roofing Hail Resistant?
A PVC membrane roof is designed to withstand extreme weather conditions, including high winds and hail, without incurring damage. However, some PVC membranes may be more vulnerable to hail damage when it falls straight down, compared to instances where the hail is wind-driven.
How Much Does PVC Roofing Cost?
The cost of a PVC roofing membrane typically ranges from $5 to $12 per square foot. When considering the installation of a PVC roofing membrane, it’s essential to take into account various factors that can influence the overall cost, including the roof’s size, the complexity of the installation, and additional materials required.
PVC Vs. Other Single-Ply Roof Membranes
TPO Roofing Membrane
PVC roofing systems are known for their excellent chemical resistance, remaining non-reactive to most chemicals. In contrast, TPO (thermoplastic olefin) membranes can react adversely to oil or exhaust from grease traps. Both PVC and TPO roofing systems have been designed to meet the fire resistance standards set by Factory Mutual and Underwriters Laboratories. In terms of tear strength, PVC roofing registers at 45 lbf, while TPO measures 55 lbf, indicating that TPO is stronger. Additionally, TPO membranes have a greater break strength.
EPDM Roofing Membrane
While PVC and EPDM (Ethylene Propylene Diene Monomer) are fundamentally different, they share some characteristics. PVC is a thermoplastic, produced by polymerizing vinyl chloride and adding various additives for desired properties. Conversely, EPDM is a synthetic rubber made by polymerizing ethylene and propylene. While EPDM performs well in many environments, it struggles in the presence of oils, solvents, and similar substances, which PVC can tolerate effectively. PVC also has a superior fire resistance profile, making it a preferable choice for applications that require durability against high temperatures.