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Blown-in cellulose or fiberglass batts are often used in attics because they provide effective thermal insulation while accommodating the irregular shapes and varying depths commonly found in attic spaces. This type of insulation can be easily installed in hard-to-reach areas, filling gaps and voids that might compromise energy efficiency.

Blown-in cellulose, made from recycled paper products, also adds a layer of soundproofing and is treated with fire retardants, enhancing safety. On the other hand, fiberglass batts are pre-cut to fit standard rafter spaces, making them a reliable and manageable option for DIY insulation projects.

While other materials, such as fiberglass rolls, foam board insulation, and mineral wool, offer benefits in different contexts, they may not be as versatile or easy to apply in the unique configurations of attic spaces, making blown-in cellulose or fiberglass batts the preferred choice for many insulation professionals.