How do I correct condensation on my cathedral ceiling?
I have lived in my house for twenty years and have never had a problem with condensation. About a year and a half ago I hired someone to make my house more energy efficient. He sealed leaks in the attic, and added blown cellulose insulation. He replaced the can lights with can lights designed to have insullation placed over them. At the time he did this work, airconditioning ducts ran through the attic. Shortly after that, I installed a geothermal unit and had the ductwork redone so that it is now in the crawl space. ( While I had central air before the geothermal unit, I didn’t have central heat until after that was installed).
Now I am getting visible condensation and mold on my cathedral ceiling in my living room. It has appeared for the first time this summer as I run the air conditioner. The living room extends out from the house. Part of the cathedral ceiling is a true cathedral with only a little space between it and the roof. Part is from an A frame that extends into theattic. The condensation is worse on the part of the ceiling that extends into the attic, so that there is space between the ceiling and the roof.
The air conditioning ducts that are no longer used remain in the attic with vents into the ceiling, although can’t tell that the condensation is spaced so that these vents are relevant. It is most extreme at the peak of the ceiling.
I have had a roofer look at it who did not think roof venting was an issue. How can I correct this and what kind of person should I be consulting to get it corrected? Thanks for any help you can give me.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part