Which insulation type can be used in areas subject to extreme temperatures?

Rigid Polystyrene insulation is particularly well-suited for environments that experience extreme temperatures, both hot and cold. This type of insulation offers a high R-value per inch, providing excellent thermal resistance. Its closed-cell structure helps prevent moisture absorption, which is crucial in maintaining its insulating properties in demanding temperature conditions. Additionally, rigid polystyrene is durable and can withstand mechanical impacts, making it suitable for both above and below grade applications.

Foil-backed insulation primarily serves as a reflective barrier, designed to reduce radiant heat transfer, but it’s less effective at temperature extremes compared to rigid polystyrene. Cellulose insulation tends to settle over time and is more prone to moisture issues, which makes it less reliable in extreme conditions. Batt insulation, while popular for its ease of installation and good thermal performance, can also be compromised by moisture and is not as effective in the face of wide temperature fluctuations. Therefore, rigid polystyrene stands out as the most appropriate choice for extreme temperature applications.