Installing thick foam above roof sheathing

Does anyone have practical experience, tips, or suggestions for installing thick rigid foam insulation on a roof?We’re about to close in our timberframe in climate zone 7 and my next… Does anyone have practical experience, tips, or suggestions for installing thick rigid foam insulation on a roof?We’re about to close in our timberframe in climate zone 7 and my next…Read MoreGreenBuildingAdvisor