What type of insulation is commonly used for exterior walls in residential construction?

Fiberglass batts are commonly used for exterior walls in residential construction because they offer a good balance of thermal resistance, ease of installation, and cost-effectiveness. They are available in pre-cut sizes that fit standard wall depths, making them simple to install in framed walls. The lightweight nature of fiberglass batts also contributes to their popularity, as they are easy for builders to handle and transport.

This type of insulation is effective at reducing heat transfer, which contributes to energy efficiency in homes. Additionally, fiberglass batts are non-combustible and do not absorb moisture, helping to prevent issues like mold growth.

While other types of insulation do offer their own benefits, fiberglass batts are particularly well-suited for exterior wall applications in traditional residential construction due to their widespread acceptance, proven performance, and affordability.