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

https://telegra.ph/If-I-Only-Do-One-Thing-This-Year-What-Roof-Maintenance-Is-Most-Important-07-31

Single ply roof guarantees typically cover 15-20 years, but the real service life can stretch to 25-40 years if properly maintained. Guarantees mostly protect against material failures, not wear and tear or damage from poor upkeep