Is fiberglass batt insulation an acceptable material to close off eaves of a cathedral ceiling to stop closed cell foam? If so, if the fibe
I had closed cell foam installed in a cathedral ceiling. Fiberglass was used to stop the foam along the exterior walls. The fiberglass penetrated the interior space and the closed cell didn't create a full barrier onto the exterior plate. I had moisture build up in this area. Was the foam installed incorrectly? What can be done to rectify this?
In short they should have used solid blocking & ensured the foam made full contact with all the framing & sheathing members. Could this be the source of moisture or could it be from the cathedral area - that is hard to know as many of the needed specs are missing here. Was the cathedral area fully filled or just X amount of inches added, what is the R-Value, How many penetrations are there entering into this space (recessed lights, etc...), do you run humidifiers, vent your bath & kitchen exhaust, etc... The fix, well you would need someone in there to look over all the factors to start. Might it be as simple as fixing the eave area - possibly. Might it involve you controlling the moisture levels in the house, probably so. Might it require more insulation for the whole assembly, that could also be a possibility. For More: http://blog.sls-construction.com/2013/ice-dams-icicles-attic-condensation (Scroll down to condensation section)