What materials are commonly used for roof insulation?

Foam boards and fiberglass batts are commonly used for roof insulation due to their effectiveness and thermal performance. Foam boards provide high R-values, which indicates their resistance to heat flow, making them an excellent choice for insulating various types of roofs. They are lightweight, easy to cut and install, and offer moisture resistance, which is crucial for preventing mold growth in roofing applications.

Fiberglass batts are another popular choice, known for being both cost-effective and relatively easy to install. They are made of fine glass fibers that trap air, providing insulation against heat loss in winter and heat gain in summer. The flexibility of fiberglass batts allows them to fit well between roof rafters and joists, ensuring a snug fit that minimizes thermal bridging.

In contrast, the other materials listed, such as steel panels, rubber membranes, cedar shingles, thatch, concrete, and asphalt, are not primarily used for insulation purposes. While they can be integral to roofing systems, they do not provide the same level of thermal resistance or effectiveness as foam boards and fiberglass batts do. Understanding the characteristics of these insulation materials is crucial for selecting the right option for a roofing project, especially in climates where energy efficiency is a priority.