Blown-in fiberglass insulation does not hold moisture and if wet can quickly dry and regain its R-value. It does not work as well as cellulose as an air barrier. It is suggested that blown-in fiberglass insulation be installed by a professional as it requires special machinery to install and is not recommended to be done by the Do-It-Yourself-er’.
Blown fiberglass insulation is also rodent resistant. While blown-in fiberglass insulation is generally more expensive, it can be installed more quickly, efficiently and with less mess than other types of insulation. So take into consideration the scope of the whole project, loose fill fiberglass may be relatively equal in terms of cost.
Fiberglass loose fill insulation is made of small sand, glass particles and is at least 35% recycled materials. R-values range from 3-4 per inch.
Blown-in fiberglass as an insulator slows the spread of heat, cold and sound in structures, by trapping pockets of air, according to the International Association of Certified Home Inspectors.