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Second Skin to Fix Condensation

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Guest User
11/22/2016
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!
Todd Miller
Isaiah Industries, Inc.
11/22/2016
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.
Guest User
11/23/2016
Thank you for the prompt response! What type of insulation would you recommend if we were to add it in between the two layers, anticipating a lot of moisture content? Thanks.
Todd Miller
Isaiah Industries, Inc.
11/23/2016
You would need an insulation that had a complete vapor barrier on its underside -- against the living space. This would help prevent moisture from inside the house from reaching the back side of the outer roof where it would condense.

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