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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.
|Pieces Per Package||45||31||23||31||23||18||15||13|
|4' x 8' Size - sq. ft./Pkg||1440||992||736||992||736||576||480||416|
|4' x 9' Size - sq. ft./Pkg||1620||1116||828||1116||828||648||540||468|
|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.