Rigid Foam –> 1 – 2″-layer or 2 – 1″-layers

Hello,House build in zone 5 (south Idaho). Is it better to use 1, 2″ layer of rigid foam or 2, 1″ layers?Wall layers:sheetrock5.5″ studs (R23 batts)7/16″ OSBMento 3000 Connect/Delta Vent… Hello,House build in zone 5 (south Idaho). Is it better to use 1, 2″ layer of rigid foam or 2, 1″ layers?Wall layers:sheetrock5.5″ studs (R23 batts)7/16″ OSBMento 3000 Connect/Delta Vent…Read MoreGreenBuildingAdvisor