Code for Lower R-value in Ceiling if Closed-cell Foam is Used

Hello All,Building in zone 5 (south west idaho) where the county uses the 2017 Idaho Residential Code; which is based on the 2012 International Res. Code.https://codes.iccsafe.org/content/IDRC2017/chapter-11-re-energy-efficiencyWhile collecting insulation quotes, one… Hello All,Building in zone 5 (south west idaho) where the county uses the 2017 Idaho Residential Code; which is based on the 2012 International Res. Code.https://codes.iccsafe.org/content/IDRC2017/chapter-11-re-energy-efficiencyWhile collecting insulation quotes, one…Read MoreGreenBuildingAdvisor