What type of insulation is typically placed between the joists in a crawl space?

Fiberglass insulation is commonly used between the joists in a crawl space due to its effectiveness in providing thermal resistance and preventing heat loss. Its lightweight nature and ease of installation make it a popular choice among builders and contractors. Fiberglass insulation helps maintain comfortable indoor temperatures and reduces energy costs by minimizing heat transfer between the crawl space and the living area above.

Furthermore, fiberglass is resistant to moisture if properly installed, which is essential for maintaining the integrity of the structure and preventing mold growth in a crawl space environment. While options such as foam board insulation, cellulose insulation, and reflective insulation have their specific applications in different areas of construction, they are not as suitable for installation in crawl spaces compared to fiberglass. Foam board, for instance, is often used in foundation insulation, whereas cellulose is more commonly applied in wall cavities and attic spaces due to its propensity to settle over time when used in horizontal applications. Reflective insulation is primarily used in attics, where it can effectively reduce heat gain from radiant sources. Thus, fiberglass insulation remains the preferred choice for insulating crawl spaces effectively.