Some time ago while doing wiring work in my attic, I noticed a galvanized pipe, either 1-1/2" or 2" coming down from the roof line and entering a wall. From the outside, the pipe can be seen protruding from the roof like a typical vent. What is odd is that there is a second vent, quite remote from the subject line that I have traced and found to be used for that purpose, i.e. a vent for what appears to be all of the plumbing in the house. The other/unknown line is no where near any of the house plumbing or any fixtures. It appears to travel down to a crawl space into which it opens/ends with no further connection or cap.
My house is 100 years old and although I have found a lot of "creative" work that previous owners have done (mostly electrical, framing and bathroom air venting), I cannot for the life of me understand what this line is doing or why it would have been installed. Of course, in speaking to a lot of old timers, I have been educated in many archaic practices, the lessons of which usually begin with "Oh yeah, way back when they used to do [that] for [this purpose] and before codes existed...."
Has anyone ever come across something like this? As I said, I am about 99.9% sure that it doesn't tie into any of the plumbing.
Baffled I am,
Well, now, there's what's right and what's right and never the twain shall meet.