What type of insulation is commonly found in attics?

Fiberglass batt insulation is widely used in attics due to its effective thermal performance and ease of installation. Its design allows it to fit between standard framing, such as rafters and joists, which is typical in attic spaces. Fiberglass is also lightweight, resistant to moisture damage, and non-combustible, making it a preferred choice for many homeowners and builders when constructing or renovating attic spaces.

While other types of insulation, such as cellulose or mineral wool, may also be utilized in attics, fiberglass batt insulation remains popular for its balance of cost, performance, and installation convenience.