Rigid foam board over Flash and Batt

I am converting my attic from vented to unvented conditioned. My home is a 1940 brick structure with a slate roof, in Richmond Virginia (Zone 4a). The attic is a… I am converting my attic from vented to unvented conditioned. My home is a 1940 brick structure with a slate roof, in Richmond Virginia (Zone 4a). The attic is a…Read MoreGreenBuildingAdvisor