Insulation R-value is a measure of thermal resistance used in the building and construction industry. The R-value being discussed is the unit thermal resistance. This is used for a unit value of any particular material. Below is the table of insulation R-value for Atlas RBoard Rigid Foam Insulation. The higher the number, the better the building insulation's effectiveness.
|1 Conditioned thermal values were determined by ASTM Test Method C518 at 75° mean temperature.
Test specimens were conditioned in accordance with procedures outlined in ASTM C1289, Section 18.104.22.168
2 “R” means resistance to heat flow. The higher the R-value, the greater the insulating power.
3 Other sizes available upon request. Contact your local Atlas sales office.