I found a water drip leak on both edges of a 3” PVC pipe-coupling located over my basement ceiling. The pipe runs horizontally above a bathroom closet with another PVC pipe running just adjacent and a couple of copper pipes under it. I can put my hand up through a hole in the drywall and access the coupling but don’t think it will be straightforward to cut and replace.
Not sure what the pipe is carrying but it appears that it is venting my furnace exhaust to the outside. In the winter I turn on the whole-house humidifier and I am wondering if water is condensing in the pipe and dripping out (one drop about every 1-2 min).
First, does this sound reasonable? Any chance there is a safety risk? (I have a carbon monoxide monitor on every floor including the basement and it hasn’t gone off)
Second, any suggestions on how to fix the leak would be appreciated. Can I use putty over the coupling joint like the JB Weld water weld? Is there a better product that I should use?