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Shooting house metal roof sweating

If you can remove metal easily then lay plywood then cover in felt paper and re-install metal roof....if you cant remove easily then you might could try stapling felt paper to underside of your lath or purlin strips between rafters....or as mentioned, foam board or bubble wrap barrier.
 
Bubble insulation. Shiny side up. Duct tape it.
This, except, I'd get the tape made for vapor barrier. I've tried duct tape, but the heating and cooling seems to cause it to fail to adhere over time. You can buy a small roll of vapor barrier/insulation on Amazon fairly cheap. Tape it so there are no gaps, you should be good to go. Also, It's recommended you leave a gap of at least one inch between metal roof and barrier.
 
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