What Is TPO Roofing? A Complete Guide
Thermoplastic polyolefin roofing is a relatively new material that offers a durable and economical option when looking for a new or replacement roof. Typically used for commercial and industrial building, TPO roofing may also be a good choice for residential projects. Ongoing research projects that the aim to improve properties, such as strain resistance and other important attributes, is likely to result in practical applications of TPO as a roofing material.
Properties of TPO Roofing Material
Delving into the pros and cons of this roofing material is important to understanding how a TPO membrane works. The best material for one type of project may not be a good fit for another, so figuring out what makes each type of roofing unique is key to making the right choice for your new or replacement roof.
What Does TPO Stand For?
TPO stands for thermoplastic polyolefin. There are various TPO formulations, generally consisting of a combination of a thermoplastic polymer and a filler. Common thermoplastics are polyethylene and various types of polypropylenes, while filler materials may include fiberglass, talc, carbon fiber and others. TPO manufactured for roofing can also include chemicals to serve as fire retardants, UV reflectors and more.
When used for roofing, TPO comes as a single-ply membrane and may vary in elasticity, as well as strain resistance. The specific components and manufacturing process for a specific blend can affect how well it will perform as a roofing material. Researchers continue to work on ways to address potential issues and to further improve the product.
What Is the History of TPO Roof Membrane?
The TPO membrane was initially developed as an alternative to materials such as PVC and EPDM, which is an extremely durable synthetic rubber roofing membrane typically used on low-slope roofs. TPO was made to present the flexible qualities of these materials while also offering increased durability.
TPO was used as a flexible sheeting in a variety of settings. It was first manufactured for TPO roofing in the mid-1980s. Since then, the TPO manufacturing process has undergone several changes in order to improve the material. Some of these improvements include reinforcement for durability as well as better UV resistance and the ability to heat-weld for easier manipulation.
Today, TPO is one of the most popular roofing components. It occupies the largest global market share for single-ply roofing materials. Over the years, technological developments have included increased weather and solar resistance as well as lasting flexibility.
Pros and Cons of TPO Membrane Roofing
There is no such thing as a universally perfect material. However, with some research, you can find the material that works best for your project. In addition to considering the various attributes of TPO roofing, think about how they could affect important aspects of your project. Factors such as climate, budget and intended building use can all play a role in the selection of your roofing membrane.
What Makes TPO Roofing Effective?
TPO roofing is heat and UV resistant. It is also heat-weldable, making it easy to work with. This material also offers several other benefits:
- Durability: TPO membranes tend to retain flexibility for a long time after installation. This is important because a building may settle over time. It is also normal for a building to undergo thermal expansion and contraction, especially in climates with large temperature variations. Depending on the type of ground and the possibility of earthquakes, using TPO can be key to preventing cracks and other issues developing. This material also resists damage from impact, mold and dirt accumulation.
- Cost-Effectiveness: Compared to other types of single-ply membranes, TPO roofing tends to be fairly economical. Specific costs may vary depending on the manufacturer and the specific type of material. For example, you may need TPO with additional reinforcement.
- Versatility: A TPO roof offers several color options so you can complement your building's style. All colors are reflective and UV resistant, allowing you to reap the energy-savings benefits of this material. It’s important to note that different colors may provide differing levels of protection, with lighter colors offering a higher level of reflectivity.
- Energy Efficiency: While white reflective TPO membranes offer the highest level of cooling and energy conservation, all TPO roofing colors have reflective properties that can substantially reduce your air conditioning bill. A large selection of TPO roofing appears in the EPA's Energy Star certification list.
TPO roofing membranes usually come in wider sheets than comparable materials. This, along with their lighter weight, makes them easier — and thus cheaper — to install. The increased width also means fewer seams, which contributes to durability and energy efficiency.
What Issues Can Arise With a TPO Roof?
There are two considerations that can make TPO a less than optimal roofing choice for some projects. If these are relevant to you, you might opt to go with a different material or look into specialized TPO products.
First, TPO roofing material can experience an increased rate of deterioration when consistently exposed to excessive heat loads. This can be a concern in very hot climates. If you think heat loads may be an issue, it is advisable to contact the manufacturer to discuss the product's capacity.
Second, as TPO manufacturing technology continues to evolve, there is not always enough data about a specific product's lasting performance. While the latest cutting-edge development can sound good, you do not necessarily have the information to know how long you can expect the TPO roof to last. Working with an established manufacturer with a solid track record can help. Be sure to also review the product warranty terms, which tell you the extent to which the company will stand behind its product.
Making Your Choice
Whether you are looking for a new roof or replacing existing material, TPO roofing can offer a variety of advantages. There are several TPO manufacturers and many types of product. Researching available TPO materials can provide you with important information.
Working with reputable roofing contractors in your area is another way to source the right roofing materials for your project. Skilled professionals can recommend the best material for your roof and explain the pros and cons of various options. Not sure who to call? We can help you find experienced, reliable professionals who can get the job done.