Dry and mechanically protected: decades — mineral wool, calcium silicate and cellular glass don't age thermally in any meaningful way. What actually ends insulation life: water ingress (jacket failure), mechanical damage (foot traffic, maintenance), and removal-without-reinstatement during service work. That makes lifetime a SYSTEM property, not a material one: jacket integrity inspections, walkable-rated materials where people walk, and removable covers on everything that gets opened are what buy the decades.
Compute your own case: free heat-loss calculator · materials library: 12 datasheets · related: What is CUI (corrosion under insulation)? · Does mineral wool recover after getting wet? · What is economic thickness of insulation? · R-value vs k-value (λ) — what's the difference?
