Which insulation type is considered the most efficient for framed walls?

Batt insulation is commonly used in framed walls due to its effectiveness and ease of installation. It typically consists of fiberglass or mineral wool and is pre-cut to fit standard stud spacing, making it straightforward for builders and owner-builders to work with. Its design allows it to provide a good balance of thermal resistance while filling the cavities of walls efficiently, preventing gaps that could lead to thermal bridging. Additionally, batt insulation can be a cost-effective option and is readily available in various R-values, allowing for improved energy efficiency in different climate zones.

While other insulation types have their specific advantages, batt insulation stands out in application for framed walls due to its practicality and performance in improving energy efficiency and acoustic control within residential construction.