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

https://www.a1bookmarks.win/single-ply-roof-guarantees-typically-cover-15-20-years-but-a-roof-s-real

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