Have you heard of this type of Condensation Before??

Guest User
5/19/2006
Hello Experts- We have a metal roof that was installed in 2002. We are located in Northern New York State. We get condensation and dripping in the winter from the cold roof and hot air in the house. They put a 3/4" insulation under the roof. We also have cathedral ceilings so there is no air space between the ceiling and roof. We also do not have any vents. WE were told by a contractor that we need to add more insulation and bring the metal roof down. Have you heard of condensation of this sort when a metal roof is applied? Thank you. Mary Hoffman
Todd Miller
Classic Products, Inc.
5/19/2006
Yes. A properly designed roof system will have at least 1" vented airspace, per building code. Not having this can lead to condensation problems regardless of the roofing material. Ideally, construction will include a vapor barrier, attic floor insulation, vented airspace, roofdeck, and underlayment. Not having one or more of these things will likely lead to condensation.
Guest User
5/23/2006
Thank you. We have had a roofer come out and look at our situtation and his solution, because there is so little airspace, is to put vents in the peaks to create an airflow, take out the "blueboard" insulation that is in there that is not allowing an airflow and just have the strapping, felt paper, metal roof and we have wood tongue and grove pine ceilings. We are apprehensive about not having any insulation. He told us that between the metal roofing, wooden ceiling and air space it probably will cut down on our fuel bill. What is your feeling on this? Thank you
Todd Miller
Classic Products, Inc.
5/23/2006
I am sorry but you are in a rough spot. Somehow, you need to either get some good ventilation going or a complete vapor barrier behind the ceiling, or both. What he is proposing will get some ventilation. I just hope it will be enough.
Guest User
5/24/2006
I am going to try to super-insulate my cathedral ceilings with no ventalation. I think maybe if I do 6 inches of ridgid foam all caulked, then very little heat will be able to escape, and I hope any condensation will occur under the metal to run down on top of the ice and water.
Guest User
5/24/2006
Can anyone give me a recipe for a condensation free roof without venting. My roofline is not good for venting as it has a gable roof that is wrapped by a hip roof on the lower half, and it has four dormers. I guess you can drill holes in all the rafters, but will that really help. I have also heard you can build a new venting roof on the underside of the roof. That doesn't seem to good either. Other wise I could vent each section in a way other than with a ridge vent. But it just seems more advantageous to build an R-40 insulation value into the roof. Any ideas?
Todd Miller
Classic Products, Inc.
5/24/2006
Condensation occurs when warm moist air hits a cool surface. Eliminate the warm moist air or the cool surface and you have it made. Oftentimes building a vented roof over the current roof is a big help. Putting a vapor barrier behind the ceilings in the house will prevent moisture migration into the attic and be very helpful as well.
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