Which two types of insulation are commonly found in attics?

Fiberglass and foam board insulation are indeed two commonly found types of insulation in attics due to their specific benefits. Fiberglass insulation is a popular choice because it is lightweight, has a high insulating value, and is non-combustible. It is often available in batts or loose-fill forms, making it versatile for different attic configurations. Additionally, fiberglass insulation is moisture resistant, which is crucial in preventing mold growth in the often humid environment of an attic.

Foam board insulation also plays a significant role in attic insulation because it offers excellent thermal resistance and is effective in preventing air leaks. Foam board can be used in both new construction and retrofit situations, providing a continuous layer of insulation that minimizes thermal bridging through framing members. Because it is rigid, it can easily be fitted into tight spaces and can serve as both insulation and a moisture barrier.

In contrast, options like concrete and cellulose, or mineral wool and cotton, do not have the same level of prevalence or suitability for attic insulation as fiberglass and foam board. While cellulose is indeed an option commonly used for its eco-friendliness, it may not be as widely recognized as fiberglass or foam board in attic applications. Thus, the selected option accurately reflects the most commonly found insulation types and aligns