TPO vs EPDM: Which Roofing Material Is Better for Your Building?

January 16, 2024

If you are looking for a roofing material for your flat or low-slope roof, you may have come across two popular options: TPO and EPDM. Both are types of single-ply membrane roofing systems that offer durability, flexibility, and weather resistance. However, they also have some differences that may affect your decision. In this article, we will compare TPO and EPDM in terms of their characteristics, advantages, disadvantages, and costs.

What Is TPO Roofing?

TPO stands for thermoplastic polyolefin, a synthetic rubber material that is composed of polypropylene and ethylene-propylene rubber. TPO roofing is manufactured in large sheets that are rolled up and transported to the site. The sheets are then attached to the roof deck using adhesives, fasteners, or heat welding. TPO roofing is usually white in color, which helps reflect the sun’s rays and reduce the cooling load on the building.

What Is EPDM Roofing?

EPDM stands for ethylene propylene diene monomer, another synthetic rubber material that is made from ethylene and propylene. EPDM roofing is also produced in large sheets that are rolled up and delivered to the site. The sheets are then adhered to the roof deck using adhesives, fasteners, or ballast. EPDM roofing is usually black in color, which absorbs the sun’s heat and keeps the building warm in cold climates.

TPO vs EPDM: Pros and Cons

Both TPO and EPDM have their own pros and cons that you should consider before choosing one for your roof. Here are some of the main factors to compare:

  • Durability: Both TPO and EPDM are durable and resistant to punctures, tears, and impacts. However, TPO has stronger seams than EPDM, which makes it less prone to leaks. TPO is also more resistant to chemicals, oils, and grease than EPDM, which can degrade over time. EPDM, on the other hand, has better resistance to UV rays, ozone, and weathering than TPO, which can fade and crack over time.
  • Longevity: Both TPO and EPDM can last for 20 to 30 years, depending on the quality of installation and maintenance. However, TPO is a newer product than EPDM, so it has less proven track record and may not perform as well as expected. EPDM has been around for longer and has more established reputation and performance history.
  • Energy Efficiency: Both TPO and EPDM can help reduce the energy consumption of the building, but in different ways. TPO is more energy efficient in hot climates, as it reflects the sun’s heat and lowers the cooling costs. EPDM is more energy efficient in cold climates, as it retains the sun’s heat and reduces the heating costs. However, both materials can be modified to suit different climates, such as adding a reflective coating to EPDM or a dark color to TPO.
  • Appearance: Both TPO and EPDM can provide a smooth and seamless look to the roof, but they differ in color and aesthetics. TPO is usually white, which can blend well with most buildings and environments. EPDM is usually black, which can contrast with the surroundings and create a more modern and sleek look. However, both materials can be customized to match the color and style of the building, such as adding patterns, textures, or logos to the surface.