Second Skin to Fix Condensation

Thank you in advance for your time and help. My friend's company has a warehouse in Kathmandu, Nepal. Roof is a single layer corrugated metal and it is having condensation problems. Water is dripping from the roof every morning. I have suggested something like Dripstop or spray-foam on the underside of the roof to mitigate the problem. For whatever reason, they have decided just putting another layer of cgi. My feeling is that it is not going to fix the problem and water will be trapped in between. What would your advice be? And under what condition would adding a second skin work for fixing condensation? Thank you!

Adding a second layer may work if the additional layer creates an airspace that can be vented. If the new layer is directly in contact with the original layer of roofing, I am afraid the condensation will continue on the underside and possibly between the two layers.