Attic Insulation: lifespan, maintenance and replacement

Typical lifespan: 20–100 years (type dependent) (about 50 years).

Maintenance schedule

• Visual inspection for settling or damage — Annually
• Check for pest intrusion — Annually
• Inspect after roof leaks or storms — As needed
• Verify R-value meets current code — Every 10 years

Signs it needs replacing

• Uneven temperatures between rooms
• Ice dams forming on roof edge in winter
• High heating/cooling bills
• Insulation is wet, compressed, or has pest damage
• Visible daylight through roof boards

Tips

Insulation targets depend on climate and building design. EPA recommends assuming vermiculite insulation may contain asbestos: do not disturb it or attempt DIY sampling. Consult a qualified asbestos professional before adding or removing insulation.