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
2017-09-24 15:13:11.000000
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.
