Single ply roof guarantees typically cover 15-20 years, focusing on materials...

https://jasperotbu571.iamarrows.com/should-the-manufacturer-survey-the-deck-before-quoting

Single ply roof guarantees typically cover 15-20 years, focusing on materials and workmanship under ideal conditions. But in reality, these roofs can last 25-40 years if well maintained. Factors like weather, foot traffic, and drainage impact longevity