Above the trailer roof is a metal pitched roof with no soffit and lots of air-flow. I plan to recess the insulation 6" to allow airflow. There is a suggestion that I need a vapor barrier. If I use a vapor barrier, won’t water collect between the roof and the barrier. I was thinking if using strapping crosswise every 4” to act as a channel for water runoff. Any ideas?
The roof is already a vapor barrier, you won't need 2.
