Attics often are troubling areas when it comes to perfect insulation.
Foam board insulation overcomes this barrier, and it would not be unreasonable to consider it as among the most preferred solutions to insulation problems.
Continuous insulation products vary and should be chosen with care as every space is different and requires specific treatment.
R- values are nothing but a measure of the resistance to the heat-flow.
R-values are specified based on the climatic conditions; The higher R-value would require thicker insulation protection.
Both commercial and residential sites opt for rigid foam insulation products.