SM-Rib panels over 2x4 purlins?

I am building a barn/garage and would like to use a 26ga 3/4" rib metal panels with exposed fasteners on 2x4 purlins 24" oc nailed to 3/12 gable trusses with radiant barrier applied over the trusses (under the purlins) the attic will be blown in cellulose. My question is- will this be a good application or would 5/8" sheathing be better? I have heard conflicting answers. I have a pole barn with no insulation that has the same application without the radiant barrier that has handled a few hurricanes with no damage. Looking for an expert opinion. Thank you.		David Kissinger SM-Rib substrate 9/24/2017	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/22458/find/
David, since this is a barn / garage, I probably do not have condensation concerns though I often do when I hear of installations without decking. My feeling though is that, with your construction as outlined, you will get better uplift resistance (wind resistance) with decking than without.		Todd Miller Isaiah Industries, Inc. 9/24/2017	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/22459/find/

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