Different types of insulations have different life expectancies so you may be able to estimate how long yours will last if you know when it was installed.
Roof insulation life expectancy.
According to the international association of certified home inspectors or internachi most types of insulation have a life span much longer than homeowners might think.
For the most part maintaining attic insulation is pretty easy.
Cellulose insulation can last for decades fiberglass insulation up to 100 years and spray foam could outlast your home.
Housewrap wrap tape and spray foam last 80 or more years while loose fill foamboard cellulose fiberglass rock wool and loose fill all last 100 years or more.
Built up roofing bur.
Fiberglass insulation can potentially last 80 to 100 years if it is undamaged but bits can start to fall from fiberglass batts after 15 or 20 years.
A properly insulated attic keeps the home warm keeps energy bills low and protects the roof and home during a heavy snowfall.
Affordability and insulation qualities are major reasons why foam roofing has rapidly become popular in just under 30 years.