Do your research, the numbers don’t lie!
Expanded polystyrene (EPS) is an innovative building material that lends to the design and structural integrity of many building projects. Since the 1950s, EPS has been recognized as a mainstream insulation material, however over the past decade, new applications have rapidly developed. Now, EPS is a powerful design element and an ideal choice for green building design, offering tangible environmental advantages that can maximize energy efficiency, providing improved indoor environmental quality and enhancing durability.
EPS provides a permanent lifetime R-value. The five year and 50 year R-values for EPS are the same as the initial R-value since the gas trapped in the cells of EPS is atmospheric air. Unlike polyiso and XPS, EPS does not lose R-value over time. This is one reason the National Institute of Standards & Technology (NIST) chose EPS as the Standard Reference Material for Thermal Conductivity (SRM 1453), using specific samples certified in 1996 that still provide the same R-value today.
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