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I have an enclosed porch that is not heated. It has 2 x 12 roof beams and is not insulated. The porch gets very hot in the summer time and I want to insulate the ceiling. I know I can easily install soffit vents and installation, but there is no ridge vent? Is this an issue on a porch? I was thinking I could use R-19 which would leave five inches of space between the roof and the installation.Is that enough room for the roof to breath and not cause rotting? Any thoughts on this??