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I've seen condensation building/dripping. From rafters without sheathing with this type of installation .
9/7/2018
Or copy this URL: https://www.metalroofing.com/spirit/comment/23553/find/There are some metal roofs which can be installed without decking. However, I never suggest that for residential applications. That said, other keys to avoiding condensation with any roof system other than those installed over conditioned spaces include vapor barriers, insulation, and ventilation.
Isaiah Industries, Inc.
9/7/2018
Or copy this URL: https://www.metalroofing.com/spirit/comment/23554/find/