You will need to select a material can use combinations of insulation from the library with similar thermal properties to the material being used. You can find the material library in spreadsheet form as part of that add up to the CBECC-Com installation in the C:\Users(your username)\Documents\CBECC-Com 2013 Data\Documents\RulesetSource\CEC 2013 Nonres\Rules\Tables folder of your computer.desired R-value.