Single ply roof guarantees typically cover 15-20 years, reflecting manufacturer...

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

Single ply roof guarantees typically cover 15-20 years, reflecting manufacturer confidence under ideal conditions. The actual service life can stretch to 25-40 years with proper care