If you’re new to insulation calculations such as those values for R, board insulation is usually easy to work out as well as being easy to install. Use our online calculator at Universal Construction Foam as a good starting point and then call our helpful customer service team on 410-498-0000. The R-Value relates to the thickness and density of the foam sheets you’re planning to install and we can assist you in making that decision. Take a look at https://universalconstructionfoam.com/calculators/insulation-r-value-calculator/