I have a stench pipe which runs through the middle of the house due to the extension.
I noticed a trickle of water running down the outside, more noticeable following a shower.
I was wondering if the pipe could be blocked as the water is coming from the very top.
I am assured it is not due to the roof tiles as they have all been checked.
The water is causing a very light brown stain around the joints of the pipe.
Any help or pointers would be appreciated.
Thanks

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I noticed a trickle of water running down the outside, more noticeable following a shower.

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If this were my house I would wait for the next rain and go up in the attic with a wad of toilet paper. I would start at the vent I noticed the water on. Start wiping the vent down from very top. At the first sign of moisture on the TP stop. That will be the source of your leak. Let me know what you find. Good luck, Tom,