XPS foam has an excellent R-value, typically ranging from R-5.0 to R-5.5 per inch (RSI-0.035 to 0.039 per mm) at a mean temperature of 24°C (75°F). It’s crucial to understand that XPS, like all plastic foam insulation using blowing agents other than air, undergoes “thermal drift.” Initially, the insulating gas trapped in its closed cells provides a high R-value. Over time (typically 5-20 years), this gas slowly diffuses out and is replaced by air, causing the R-value to settle at a lower, stabilized level. Modern XPS manufactured with environmentally friendly blowing agents like HFOs or CO₂ is rated using a Long-Term Thermal Resistance (LTTR) value. This LTTR value, clearly marked on quality boards, is the scientifically proven, 15-year time-weighted average R-value you can rely on for energy calculations.
What is the R-value of XPS foam, and does it change over time?
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