I recently bought a home which was a renovation. I had a water leak from the ceiling in an upstairs room. Upon opening up the drywall, I noticed there was what appears to be a vent of some sort that is sealed at the top.
I noticed a new vent over the bathroom made of PVC. I see condensation on the inside of the rubber cap that seals the old black metal vent. Should I insulate the old pipe and wrap in plastic to stop any leaking, condensation or otherwise? Or should I remove the vent entirely?