NRCA’s EnergyWise Roof Calculator Online has been updated to include information from the 2015 versions of the International Code Council’s IECC and IgCC, as well as the 2013 version of ASHRAE Standard 90.1. Revised minimum long-term thermal resistance values and NRCA’s latest recommendations for minimum R-values for polyisocyanurate insulation have been included in the application. The application also will determine the temperature gradient through a roof assembly and present the information graphically on a report.
Users will find this beneficial when evaluating the effectiveness of a vapor retarder. The EnergyWise Roof Calculator Online is available for free on NRCA’s EnergyWise Roof Calculator page.