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Fiberglass batts and blown-in cellulose are widely used in attics due to their effective thermal insulation properties, cost efficiency, and ease of installation. Fiberglass batts come in pre-cut pieces that fit between attic joists, providing an efficient method to insulate the space. Blown-in cellulose, made from recycled paper products, is a versatile material that can fill gaps and contours, making it ideal for irregularly shaped attic spaces.

These types of insulation are chosen for their ability to reduce heat loss during the winter and heat gain during the summer, helping to maintain a more consistent temperature in the home. Additionally, both fiberglass and cellulose have a good balance of thermal resistance, also known as R-value, which is essential for effective insulation.

Though other options like mineral wool, polystyrene panels, and spray foam insulation have their merits and applications, they are not as commonly utilized in attics as fiberglass batts and blown-in cellulose. Mineral wool is often used in different locations due to its fire resistance, while polystyrene panels are more suited for areas requiring structural insulation. Spray foam insulation provides a superior air seal and higher R-values but can be more expensive and labor-intensive, making it less common for standard attic insulation compared to fiberglass and