What Are TPO And PVC Roofs?
TPO Roofing (Thermoplastic Polyolefin) is a relatively newer roofing system that has gained popularity in recent years. TPO roofing membranes consist of three layers: a TPO polymer base, a polyester-reinforced scrim, and a TPO compounded top ply. This roofing system is made from a blend of polypropylene and ethylene-propylene rubber, polymerized together to create a durable and flexible roofing material. TPO roof systems have been in use for about 30 years and are constantly evolving to improve their performance and reliability.
PVC Roofing (Polyvinyl Chloride) has been a trusted option in the roofing industry for over six decades. PVC roofing membranes are composed of two layers of specially-formulated vinyl, bonded to a polyester reinforcement scrim layer. This thermoplastic material is known for its exceptional durability, flexibility, and resistance to weathering, chemicals, and UV radiation. PVC roof systems have a long-standing reputation for reliability and performance in various environmental conditions.
By the end of this comparison, you’ll likely choose either TPO or PVC for your roofing system. Regardless of which option you pick, be sure to request a quote from Best Roofing LA – we are one of the top Los Angeles Roof Installers.
TPO Roofing Vs. PVC Roofing
While both TPO and PVC belong to the thermoplastic, single-ply roofing family, they differ significantly in their base chemical composition and performance characteristics.
PVC roofing membranes have been in use since the 1960s, whereas TPO roof systems were introduced in the 1990s. TPO manufacturers continue to refine their formulations to enhance performance, while PVC has maintained consistent performance over its long history. One notable difference is in flexibility, with PVC roofing membranes being slightly more flexible than TPO, making them easier for contractors to work with during installation.
1. Lifespan
The lifespan of a roofing system is a crucial consideration for any building owner. TPO roof lifespan typically ranges between 15 to 20 years, with proper maintenance potentially extending their lifespan to 30 years. In comparison, PVC roofing systems can easily last 30 years or longer. Both TPO and PVC roofing membranes benefit from regular roof inspections and routine repairs to maximize their longevity. Manufacturers of both roofing systems offer extended warranties, providing additional peace of mind for building owners.
2. Cost
When comparing the cost of TPO roofing vs. PVC roofing, TPO generally comes out as the more affordable option. The TPO roofing costs can range between $3.5 to $10 per square foot installed, depending on factors such as roof size, membrane system, and insulation thickness. The TPO roofing membrane itself ranges from $1.00 to $2.50 per square foot. PVC roofing, on the other hand, tends to be more expensive, with installed costs ranging from $5 to $13 per square foot. PVC roofing materials alone cost $2 to $4 per square foot, with professional installation adding another $3 to $9 per square foot.
3. Installation Method
The installation methods for TPO and PVC roofing systems share some similarities but also have distinct differences.
TPO roofing membranes can be installed using mechanical fasteners, bonding adhesives, or ballasting systems. Each method has its pros and cons, with fully adhered systems offering better protection against air bubbles and shifting, while mechanically attached systems provide quicker installation times.
PVC roofing installation primarily involves three methods: adhesive application, mechanical attachment, and induction welding. Both TPO and PVC roofing systems require heat-welded seams to create a watertight seal. However, PVC roofing’s heat-welded seams are known for their exceptional strength and durability, becoming one of the strongest parts of the roofing system.
4. Energy Efficiency
Both TPO and PVC roofing membranes feature white, reflective surfaces that contribute to energy efficiency. However, TPO roofs are generally considered more energy-efficient due to their higher solar reflective index (SRI). Building owners can expect to see energy savings of up to 50% with TPO roofing systems, while PVC roofs typically offer energy savings of up to 40% annually.
5. VOC-Free Installation
When it comes to environmental considerations, TPO roofing has an advantage in terms of VOC-free installation. TPO roofing membranes can be adhered without additional volatile organic compound (VOC) containing adhesives, making them a more environmentally friendly option. PVC roofing manufacturers have also developed formulations with reduced environmental impact, including phthalate-free and low-VOC options, but they may still require some VOC-containing materials during installation.
6. Maintenance Requirements
Maintenance needs differ between TPO and PVC roofing systems. TPO roofs require a strict maintenance schedule to extend their lifespan. TPO roofing maintenance includes routine washing and regular debris removal. PVC roofing, on the other hand, is known for its low maintenance requirements. PVC roof membranes are lightweight and generally do not require additional coatings or frequent repairs to maintain their performance.
7. Puncture Resistance
In terms of puncture resistance, TPO roofing membranes have a slight edge over PVC. TPO roof systems tend to perform better against punctures from sharp objects like blades, HVAC panels, and screws. This increased puncture resistance can be particularly beneficial in areas with high foot traffic or where rooftop equipment is present.
8. Chemical Resistance
PVC roofing systems excel in chemical resistance, with the membrane being non-reactive to most chemicals. This makes PVC roofs an excellent choice for buildings exposed to chemical pollutants or in industrial settings. TPO roofing membranes, while generally resistant to many chemicals, may react to oils or exhaust from grease traps, which could be a consideration for certain applications.
9. Fire Resistance
Both TPO and PVC roofing systems offer good fire resistance properties. TPO roofing is typically rated as a Class A fire-resistant material, providing reliable protection against fire hazards. PVC roofing is often considered to have superior fire resistance compared to TPO, with inherent fire-resistant properties that make it self-extinguishing under certain conditions.
10. UV Rays And Heat Resistance
PVC roofing membranes are known for their excellent ability to reflect UV rays and heat, making them ideal for use in areas with harsh climates. TPO roofing systems are also designed to be heat and UV-resistant, containing additives that protect against UV radiation damage. However, over time, UV exposure can lead to the degradation of TPO roofing materials, potentially causing them to become brittle or lose flexibility.
11. Cold Resistance
TPO roofing systems demonstrate excellent cold resistance, with the ability to expand and contract without cracking in varying weather conditions. TPO roof membranes can withstand temperatures as low as -50°F. In contrast, PVC roofing may not be the best option for colder climates, as it can be susceptible to shrinking, cracking, and puncturing when temperatures drop below 45°F.
12. Wind Resistance
Both TPO and PVC roofing systems offer impressive wind resistance capabilities. These roofing membranes can withstand winds from Category 3 hurricanes, with speeds ranging from 110 mph to 130 mph. This makes both options suitable for areas prone to high winds or severe weather events.
13. Hail Resistance
When it comes to hail resistance, both TPO and PVC roofing systems perform well, but with some differences. New TPO membranes can resist hail damage on TPO roof from hailstones up to 1.75 inches in diameter, while PVC roofs can typically withstand hailstones up to 1.5 inches. However, as the roofing materials age, their hail resistance may decrease. After 10 years, TPO roofs can generally withstand hailstones up to 1.25 inches, while PVC roofs may only resist damage from hailstones under an inch in diameter.
14. Material’s Strength
When comparing the strength of TPO roofing vs. PVC roofing materials, each system has its advantages. TPO roofing membranes generally have higher tear strength (55 lbf) compared to PVC (45 lbf). TPO also excels in break strength (427 lbf) and compressive strength (7977 lbf). However, PVC roofing demonstrates superior tensile strength (6816 lbf) compared to TPO (2973 lbf). These differences in material strength can impact the overall performance and durability of each roofing system in various applications.
TPO Or PVC? Which Roofing System Is Better?
In the comparison of TPO roofing vs. PVC roofing, both systems have their strengths and potential drawbacks.
TPO roofing offers affordability, energy efficiency, and excellent cold resistance, making it a popular choice for many commercial and residential applications.
PVC roofing, with its long-standing reputation, provides superior chemical resistance, fire resistance, and durability, particularly in harsh environments.
The choice between TPO and PVC roofing systems ultimately depends on specific project requirements, climate conditions, budget constraints, and long-term performance expectations.
