Home > categories > Construction & Real Estate > Roofing Insulation > I want to put 19" un-faced fiberglass insulation on my trailer roof. I think a vapor barrier could cause a problem?
Question:

I want to put 19" un-faced fiberglass insulation on my trailer roof. I think a vapor barrier could cause a problem?

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?

Answer:

your plan is good ...
The roof is already a vapor barrier, you won't need 2.

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