Hi we recently added soffit venting to our home as it had none. Now that the cold weather is here we noticed that we had condensation forming on the ceiling along a joist (above the ceiling) that runs from the soffit area over the shower...the shower is about five feet from the exterior wall. We have added caulking to stop air leaks and lots of fiberglass attic insulation but still have the problem. What can we do to fix this? I will be upgrading our bathroom fan as it appears to be under sized but being that this is caused by cold spots I'm not sure that will help.