How long does the insulation last for before you need to top it up again or does it last forever?
A typical blown attic installation last upwards of 20 years. All blown insulation settles and most contractors add a correction factor to account for a bit of settling that occurs in the first few months. Blown attic insulation is often upgraded as our building codes call for higher R-Values as well. Have an Insta Insulation technical sales rep visit your home and see what the level of insulation is in your attic today.