We had a new roof put on 17 months ago. It is a low pitch roof (2-12). A continuous ridge vent was installed that runs the length of the 50’ 6" roof. Not long after the job was finished I called the roofer back to point out to him what looked like a couple of small yellowish drip stains running down (maybe 6" long) from near the exposed center beam in the living room’s 12’ wide cathedral ceiling. Without getting on a ladder, he looked at it and said it probably was condensation. We decided to monitor the situation. After a time, the stains disappeared and we assumed he had been correct.
During the past 17 months though we would occasionally discover spots on our living room furniture and floor. My wife thinks these usually appeared a few days after a rain. We would examine the ceiling, but could see no stains on the ceiling, so were at a loss as to what was causing this. I believe I did stick my head up in the crawl space during one storm and could see no dripping anywhere, but don’t remember if there were subsequent spots on the living room floor.
We even thought that it might be something in the leather furniture “expressing” moisture (or some sort of oil/resin) outward. Since there was no ceiling damage, we did nothing.
About 6 weeks ago, after over 2 years in the house, we discovered what appeared to be evidence of mold on the east side of the beam (the side where the stains were appearing below) and some dark spots on the ceiling. A mold technician advised using Spirocidin to deal with the suspected mold. We did and thought the problem solved, but recently noticed more spots on the floor. Inspecting from a ladder today I was amazed to find numerous droplets along the bottom/east edge of the beam. Running my hand over one area of that side of the beam, I found it to be quite wet. There are also now more black dots on the ceiling extending out about 18" from the center on that side. We had a mild rain 3 days ago, but don’t remember any wind.
I began to wonder if the ridge vent could be the culprit and got up on the roof and took the attached photo.
I don’t know what the ridge vent looked like right after installation, or if there is a problem with this, but I am wondering if the waviness evident is problematic or normal after 17 months exposure to sun and weather. After searching the web a bit tonight, I am beginning to wonder if the ridge vent should be removed and some other form of venting installed. What do you think?