Single ply roof guarantees usually cover 15-20 years, but with proper care, the...

https://www.first-bookmarkings.win/single-ply-roof-guarantees-often-cover-15-20-years-but-the-real-service-life

Single ply roof guarantees usually cover 15-20 years, but with proper care, the roof can last 25-40 years. The guarantee focuses on materials and workmanship, not wear and tear or maintenance issues