anti-condensation

Hi all I’m planning on turning the garage into a workshop and have noticed this winter (we only moved in last year) that the corrugated metal roof seems to gather a lot of condensation. It drips down, not torrentially, but I’d want to sort it out before I get the electricity put in obviously...

This weekend I'm going to re-roof our big garden shed, it's about 5.5x3.5m with a single pitch. An asbestos contractor is coming to remove the leaky old roof. I have shiny new 0.7mm corrugated tin with felt backing ready to put on, 12 pieces so each run is in 2 pieces with a decent overlap. But...