Only my opinion and observation threw personal testing with different products in my yard. Metal will sweat. Nothing you can do about it except control the climate. And all ventilation does in bring in more moisture from the out side.
Metal does the same thing as your car windshield does. It radiates heat to the night sky more than the air around it. That is why your windshield will frost over with ice when the temperature is above freezing. So when you are so close to the dew point as we are this small temperature change will cause the metal to sweat.
Open cell foam insulation is the water based stuff you were asking about yesterday. It has open cells so it will absorb water just like fiberglass insulation will. Tyvek and tar paper are not vapor barriers. Water will go threw them. That is how the moisture in a house wall gets out threw the Tyvek.
Close cell foam is just that. Closed cells. It will not absorb water. So it needs to be put on a dry surface to stick. Any condensation that forms on the metal will be trapped there. Once the temperature rises the condensation will revert back to a vapor. Hopefully the closed cell was put on with very few air pockets during low humidity conditions to reduce this trapped moisture.
My solution was to put a thick rubber water proof tarp between the rafters and metal. Any condensation that forms on the metal can not drip in the barn because of this.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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