What is the temperature rating for Styrofoam Insulation (polystyrene)?

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Multiple Choice

What is the temperature rating for Styrofoam Insulation (polystyrene)?

Explanation:
Polystyrene foam insulation has a limited heat tolerance because its cells soften and can be damaged at higher temperatures. The standard maximum continuous service temperature specified for this material is about 165°F (74°C). Staying within this limit helps maintain the foam’s structural integrity and insulating performance. Exceeding this rating (such as 175°F or 185°F) can cause softening or deforming, which reduces R-value and can compromise any facings or adhesives. While 150°F is below the limit, the commonly cited rating for continuous service is 165°F, making it the best choice.

Polystyrene foam insulation has a limited heat tolerance because its cells soften and can be damaged at higher temperatures. The standard maximum continuous service temperature specified for this material is about 165°F (74°C). Staying within this limit helps maintain the foam’s structural integrity and insulating performance.

Exceeding this rating (such as 175°F or 185°F) can cause softening or deforming, which reduces R-value and can compromise any facings or adhesives. While 150°F is below the limit, the commonly cited rating for continuous service is 165°F, making it the best choice.

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