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help water condensating in the wall cavity-
Like everyone else I am learning about this and am not sure what the answer is, put I will try and contribute what I know.
Closed cell foam will provide a tight vapor barrier like PE film. The migration of water through the barrier will be slow at best. They recommend that you fill the cavity so inner and outer barriers prevent water penitration. See link below. This is a company I have been consulting with.
If a house is this tight you need to install an air to air exchanger to clean the air and move the moisture out of the house.
I think you problem is mostly due to the water in the house from paint, new wood, foam and dry wall and the weather. If you did not allow weeks for the drywall to dry and painted it the water in the drywall and the mud probably condensed on the foam. The Gypsum, hydrated calcium sulfate looses a lot of water once it is on the wall. Has anyone considered the weight of a new dry wall sheet and that of one removed in a remodel? I think is it about 1/2 the weight. My dry wall contractor would not paint for 3 weeks after installation.
This is a big continent and one solution does not fit all in building. As Murf states an interior and exterior vapor barriers are required in Canada, but contractors routinely slit the interior barriers in southern BC to prevent problems after inspectors have approved.
The problem is where is the dew point in the wall and which direction is it moving. If the interior is warm and moist and the outside is cold and dry. The dew point is in the center of the wall and moving from the inside to the outside. If the outside is warm and moist and the interior cooler and dryer the moisture is moving from the outside into the wall.
PVC wallcovering can create that barrier in the south and trap condensation on the back side in the wall. This is also the problem in southern BC. I worked to create wallcovering that was a semipermiable membrane like Tyvek to correct this problem.
I think the best solutions are ICF where the dew point is in the center of the concrete wall most of the time or SIPs panels with galvanized steel on both sides. I have seen problems with OSB or laminate on SIPs over time.
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help water condensating in the wall cavity-
I am happy to here you have some resolution. I hope our input was some help. Like I said in my post I am still learning more about this. I was up at the maker of TYPAR house rap, BBA on Thursday last week. Now I am sorry I used TYVEK on my house and garage.
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02-25-2006, 11:30 
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