Blown in insulation
Blown in insulation is made fire-resistant with cellulose; this is made to stop the spread of fire; fiberglass is hard to burn. Fire resistance is a crucial feature of in-home insulation nowadays. As long as the installation area is dry and uncontaminated, this can do the job for existing homes to increase their thermal performance.
In fact, it’s a pretty cost-effective installation for the attic, and extending the lifespan of the areas it is installed. It is best for a place where there is a restriction to traditional insulation.