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Long Term Thermal Resistance

Most people understand that the higher the R-value, the greater the insulating power of an insulation. However, many people do not understand that the R-value of polyiso and XPS is lost over the lifetime of the product.

EPS ( expanded polystyrene) has a permanent lifetime R value. Read more….

http://epsindustry.org/sites/default/files/LTTR_33116.pdf