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TOPIC: Ventilation

Metal roof condensation

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We had a log ome built two years ago. The contractor designed the roof as follows: 2 X 8 T&G (open) followed by felt, followed by 3 inches of styrofoam insulation (unfaced) followed by 2 X 4 horizontal furring strips (with vertical gaps) followed by another layer of felt (NO OSB), and then the metal roof. Our winters are in the single to low double digit range and I have condensation drips and evidence of stains where the T&G butts together in several places in my house. It appears to just be a warm air/cold air issue. The ridge vent is enclosed but with some vented strips. There were no soffit vents so I cut them in after the fact but not betwwen every beam. I still have minor issues but the unseen is what scares me in a house so new that I obviously want to preserve. what else can I do to ventilate and prevent this other than pulling off the metal and installing OSB and more felt over the furring strips and then will it affect my cooling in the summer?
Guest User

8/16/2009
I do not know that this is feasible but a moisture barrier behind the T & G would help. Otherwise, just try to maximize ventilation with what you have got and minimize moisture levels inside the home especially during the Spring and Fall seasons. Todd Miller
Todd Miller
Isaiah Industries, Inc.

8/17/2009
thanks a bunch. Is there a moisture sealant that I could put on the exposed T&G from the inside? I sprayed a coat of clear satin Polyurethane as it was being built. I noticed that if I ran all my ceiling fans in reverse that this seemed to help. How bout some dehumidifiers?
Guest User

8/17/2009
I would think the polyurethane is about as good as you can do. Dehumidifiers could help. That makes sense that running the fans could help. Todd Miller
Todd Miller
Isaiah Industries, Inc.

8/18/2009