Which type of insulation is typically recommended for exterior walls?

The recommendation for using various types of insulation for exterior walls arises from the unique properties and benefits each insulation material brings to the building envelope. Fiberglass batts are widely used due to their cost-effectiveness, ease of installation, and good thermal resistance, making them a popular choice for insulating walls. Cellulose insulation, made from recycled paper products, provides excellent air sealing and is environmentally friendly, offering good thermal performance as well. Spray foam insulation stands out due to its ability to expand and fill gaps, providing superior air sealing and higher R-values, which enhances energy efficiency in buildings.

By acknowledging that all these insulation types can be effective for exterior walls, one recognizes the variety of applications and conditions in which each material can excel. This comprehensive approach allows for tailored insulation strategies depending on the specific needs of a building, climate considerations, and budget constraints, making it advantageous for inspectors and builders to be aware of and recommend any of these options based on individual project requirements.