TPO Vs. EPDM Roofing: Which One Should You Choose?

In commercial flat roofing, two systems are commonly discussed for their popularity: TPO and EPDM roofing. Each has its own strengths and weaknesses, and the best choice for your commercial building will depend on a variety of factors.

In this post, we’ll explore what TPO and EPDM roofing are, the key differences between them, and how they stack up in terms of durability, energy efficiency, and other common roofing concerns. We’ll also look at a few specific use cases where one system might work better than the other. Keep reading to learn more about TPO and EPDM roofing and how to choose the right one for your business!

What are TPO and EPDM Roofing?

TPO Roofing

TPO stands for Thermoplastic Olefin. It is a single-ply roofing membrane known for its energy efficiency and durability. TPO is composed of a blend of polypropylene and ethylene-propylene rubber, which gives it the flexibility of rubber combined with the durability of thermoplastic. TPO roofing is typically white in color, making it more UV-reflective to help keep buildings cooler.

EPDM Roofing

EPDM stands for Ethylene Propylene Diene Monomer. It is also a single-ply roofing membrane but it is made only with synthetic rubber without the addition of thermoplastic. EPDM has been a popular choice for flat roofs for decades due to its proven performance and durability. EPDM is typically black, meaning it tends to absorb heat. It is, however, known for its excellent UV resistance and ability to withstand harsh weather conditions.

TPO and EPDM: What’s the Difference?

TPO and EPDM may seem similar, but they differ in a few key ways:

1. Material Composition: TPO includes thermoplastic, meaning it can be heat-welded at the seams to form a solid, waterproof barrier. EPDM is a synthetic rubber and is typically adhered or mechanically fastened and then sealed with seam tape.
2. Color, Texture, and Appearance: TPO is usually white or slightly off-white in color, which reflects sunlight. EPDM is generally black and tends to absorb more heat.
3. Installation and Seams: TPO’s seams are heat-welded, which creates stronger bonds than mechanical fasteners or adhesives that are waterproof and extremely durable. EPDM seams are typically fastened and taped. While EPDM is very durable, its seams can be the source of issues like leans when your roof begins to wear out.

TPO Roofing Vs. EPDM Roofing: Which is Better?

Either system may be the better choice depending on your needs. Here are some key categories and how TPO and EPDM compare within them in terms of traits and performance.

Durability

• TPO: While it is a newer flat roofing system on the market, TPO is extremely durable and resistant to punctures, tears, chemicals, weather, and wear. The only risk with TPO is improper installation. TPO expands and contracts with temperature fluctuations, and while these fluctuations won’t cause your TPO to crack or warp, improper sealing techniques can cause the seals to come apart over time. It is essential to have TPO (or any roofing system) installed by a professional, reputable roofing company.
• EPDM: EPDM has been popular for flat roofing for decades and has stood the test of time as a durable and reliable material. It is especially resistant to UV rays, ozone, and weathering, and its flexibility allows it to expand and contract without cracking or breaking just like TPO. While EPDM is perfectly durable, it tends to require more maintenance than TPO because of its installation process. The fasteners, adhesives, and tape used on EPDM tend to wear out over time, meaning preventative maintenance is key to avoiding issues.

Cost

• TPO: TPO is typically more expensive than EPDM but is still considered the cost-effective option given its longevity and energy-saving benefits. The initial cost is higher, but the potential savings on energy and repairs can offset this over time.
• EPDM: EPDM is typically less expensive upfront and has a longer track record of performance, but its tendency to attract heat and maintenance needs can incur more costs over time. You can sometimes find EPDM in other, less absorbent colors, but black is the most common and affordable option.

Energy Efficiency

• TPO: With its white, reflective surface, TPO is by far the most energy-efficient option. It helps reduce cooling costs in warmer months, making it a popular choice for buildings where temperature control and energy savings are a priority.
• EPDM: EPDM tends to absorb heat, which can increase cooling costs in warmer months. EPDM is available in lighter colors, but it still cannot match the reflective properties of TPO.

Installation

• TPO: TPO’s installation process is more specialized than that of other flat roofing systems, which contributes to its higher upfront costs. It requires specialized tools for its seam heat-welding, so hiring a licensed and reputable roofing company to do the job is essential.
• EPDM: EPDM roofing tends to be easier and quicker to install, particularly for fully adhered or ballasted systems. This incurs lower labor costs for installation and a slightly faster project turnaround time.

When to Choose TPO Over EPDM

TPO may be the better choice if:

1. Energy efficiency is a top priority, especially in warmer climates or areas that have hot summers.
2. You’re looking for a durable, reflective material that will hold up to the weather and keep your energy bills lower.
3. You want a modern roofing material that will perform and has minimal maintenance requirements.

When to Choose EPDM Over TPO

EPDM may be the better choice if:

1. Durability in extreme weather conditions is a primary concern, particularly in areas with significant temperature fluctuations.
2. Cost is a critical factor and you need a solution with a lower initial investment.
3. You are looking for a standard roofing material that will get the job done.

Getting A Commercial Flat Roofing System for Your Business in Oklahoma

Choosing between TPO and EPDM comes down to your specific needs, budget, and the features you prefer from a roofing system. TPO is the newest innovation in flat roofing, offering superior energy efficiency and durability. EPDM is tried and tested, offering a cost-effective solution.

‍Statewide Roofing specializes in TPO and other quality flat roofing systems for commercial buildings and businesses all over Oklahoma. To get started, give us a call or contact us today for a free estimate. Take a look at all of our commercial roofing services to find the one that’s right for you, or browse our portfolio for examples of our commercial and residential roofing work.