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Old 05-17-2017, 06:32 PM   #1
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Condesation in Ceiling


I have an older mobile home in Wisconsin that I use as a weekend get away. It has a flat metal roof on it. Last fall I tore down the ceiling, vapor barrier and insulation in a bedroom that had previously had water damage but no longer leaked. I added unfaced R-13 insulation, a plastic water vapor and a plywood ceiling. I then shut the trailer down for the winter. When I opened it up this spring the plywood was covered with mold, the plastic water vapor had trapped water in it and some of the insulation was soaked so I tore down everything again. It poured that day and there was not a drop of water inside so I'm still confident there are no leaks. The next day it was cold so I turned on the furnace and the room turned into a rain forest with all the condensation on the inside of the metal roof so I feel that is what happened over the winter. There is no ventilation in the roof or sides. There are no mobile repair persons in the area so I called an insulation company. They want to block off the attic with plywood from other rooms in the home and then spray 3 inches of insulation for about $500. He swears that will fix the problem and I don't need any ventilation to prevent condensation. Anyone have an opinion whether this will work or any other suggestions? I don't have a clue what else to do.

Thanks for you help.
Jerry
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Old 05-17-2017, 07:04 PM   #2
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Re: Condesation in Ceiling


Understanding the science behind condensation will help you figure out what to do.

https://buildingscience.com/document...ing-insulation
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Old 05-17-2017, 08:48 PM   #3
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Re: Condesation in Ceiling


Huh??
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