TPO and EPDM are the two most common single-ply flat roofs. They cost about the same installed. They differ on color, seams and track record. Here is how to choose.
We will look at the roof and tell you what we would put on it, and why.
The differences
Where TPO and EPDM really differ
Color and heat. TPO is usually white and reflects heat, which HomeGuide notes lowers energy costs. EPDM is typically black rubber and absorbs heat. On a sunny North Carolina roof over living space, that matters.
Price. EPDM is the cheapest membrane option on HomeGuide’s figures, from $3.50 per square foot installed. TPO starts at $4.
Lifespan. HomeGuide gives EPDM 15 to 25 years and TPO 10 to 25. Quality and thickness drive where in the range a roof lands.
Seams. TPO seams are heat welded. EPDM seams are glued or taped, so seam quality depends more on the installer’s adhesive work.
Track record. HomeGuide cautions that TPO quality varies between manufacturers because it is a newer material. EPDM has been used for decades.
Our view
Which one we would pick
For a flat roof over conditioned space, such as a porch roof or addition in the Triangle, we usually lean to white TPO for the heat reflection, from an established brand at 60 mil.
For a garage, shed or low-traffic roof where cost matters most, EPDM is a sound, proven choice.
Either way, the details decide whether it leaks: insulation, flashing at walls and drains, and the edge metal. See our TPO roofing cost guide for the extras.
Questions
TPO vs EPDM questions
Which is cheaper, TPO or EPDM?
EPDM, slightly. HomeGuide lists EPDM at $3.50 to $10 per square foot installed and TPO at $4 to $10.
Which lasts longer, TPO or EPDM?
HomeGuide gives EPDM 15 to 25 years and TPO 10 to 25 years. Thickness and installation quality matter more than the label.
Is TPO more energy efficient than EPDM?
White TPO reflects heat, which lowers cooling costs. Standard EPDM is black and absorbs heat.
Can you put TPO over EPDM?
Re-covering is sometimes possible over a sound, dry roof with a separation layer, but many roofers tear off. It depends on the deck, the insulation and local code.
What about PVC?
PVC is the most expensive and durable of the three on HomeGuide’s figures, at $5 to $12 per sq ft and 20 to 30 years.
We get on the roof, photograph what is actually there, and hand you a written report with a price. No charge, and no obligation to book the work with us. If the roof has years left in it, that is what the report will say.
