Spray foam with vent channels of corrugated foam Ont Cda climate zone 6

Contractors have historically challenged venting spray foam roof assembles in our area of Ontario Canada climate zone 6Wondering whether anyone has had success using applied vent channels to backside of… Contractors have historically challenged venting spray foam roof assembles in our area of Ontario Canada climate zone 6Wondering whether anyone has had success using applied vent channels to backside of…Read MoreGreenBuildingAdvisor