Single ply roof guarantees typically cover 15-20 years, but the real service...

https://www.paste-bookmarks.win/single-ply-roof-guarantees-usually-last-15-20-years-but-the-real-service-life

Single ply roof guarantees typically cover 15-20 years, but the real service life can stretch to 25-40 years with proper care. The guarantee mainly protects against material faults, not wear and tear or damage from poor maintenance