Rigid foam below sheathing in unvented attic

The awesome GBA article, “How to Insulate An Unvented Low Slope Roof Assembly?” and PNNL both advise to use spray foam directly below the sheathing for an unvented attic if… The awesome GBA article, “How to Insulate An Unvented Low Slope Roof Assembly?” and PNNL both advise to use spray foam directly below the sheathing for an unvented attic if…Read MoreGreenBuildingAdvisor