What type of insulation is commonly used in residential walls?

Fiberglass batts are the most commonly used insulation material in residential walls due to several key characteristics that make them particularly effective and popular. They consist of fine glass fibers, which create an insulating barrier that helps to reduce heat transfer between the interior and exterior of a home.

One of the primary benefits of fiberglass batts is their affordability and ease of installation. They are available in pre-cut sizes that fit standard wall cavities, allowing for quick and straightforward application by both professionals and DIY homeowners. This convenience makes fiberglass insulation an accessible option for residential projects.

Additionally, fiberglass batts have a good balance of thermal resistance (R-value) and moisture resistance, which are critical factors in maintaining energy efficiency in homes. Properly installed, they can help reduce energy bills by keeping homes warmer in the winter and cooler in the summer.

While other materials like polyester batts, spray foam, and mineral wool also provide insulation, they are less commonly used in residential wall applications for a variety of reasons, including cost, installation complexity, and varying effectiveness based on specific circumstances. Fiberglass batts remain a staple in residential construction due to their proven performance and practicality.