17
Feb
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