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

https://www.ready-bookmarks.win/single-ply-roof-guarantees-usually-cover-15-20-years-but-the-actual-roof-can-1

Single ply roof guarantees typically cover 15-20 years, reflecting the manufacturer’s confidence in materials, not the full service life, which can stretch to 25-40 years with proper care