Insulating a Flat roof with 2 feet of air space

I live on the North Costal of BC (Zone 5) and recently reconstructed an old war time house and removed an old pitched roof and installed a new flat roof.… I live on the North Costal of BC (Zone 5) and recently reconstructed an old war time house and removed an old pitched roof and installed a new flat roof.…Read MoreGreenBuildingAdvisor