I ran into this exact same problem. My eave vents were clogged with dust, and I was overusing the humidifier in extreme cold weather. New vents and keeping the humidity lower fixed the problem.
Many moons ago, I put a tin roof on a row house in D.C. 3/12 pitch, 1" standing seam. Leak showed up. Measured the stain, went up on roof. Sure enough, little 1" pipe penetration. I made a conical hat for it and called it a job. A week later customer calls again. Still leaking. "Wait a minute," I said. "It hasn't rained." Went back. Turns out it was an old over flow tank for the steam radiators. Home had radiators removed. They just sealed the line and left the tank in the crawl space. Every time it rained tank got water from the roof vent. It finally rusted out and started seeping. It would have stopped, eventually because of my hat. Us tearing the old roof off is probably what broke it's back. What a trip.
Thank you. What would your thoughts be in regards to a similar problem, but in a 2 story houses. The room leaking being on first floor over a rarely used master bathroom. When it rains, that's when I can hear water dripping onto the other side of ceiling. Would appreciate some advice.
Hello Christopher, Is it possible that there is a plumbing vent pipe exiting the roof over this area? If the roof flashing around this pipe isn't sealed or has deteriorated that could cause this issue. If that's the case the water could follow the pipe down through the attic, through the wall on the second floor, and down into the second floor joist space. Where that pipe turns and goes horizontal the water can drip off the pipe. This can also happen with furnace vents, bath fan vents, etc. Hope that helps.
