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Tieger plumbing

Thanks for your reply - it's a relief to know it is probably not a leak from elsewhere (and now makes more sense).

I will bother you for two small questions based on your reply.

First - when you say pitched away, I want to make sure you are talking up/down angle and not proximity to the fixtures. The pipe joint that is causing me trouble is basically in the center of the room between the shower and sink, where we connected the vent pipes before the stem heads up toward the attic - in parallel/horizontal terms it's not going away from the fixtures. (If by pitched you mean angled upward, I think there is a slight upward slant already that hopefully covers us).

Secondly, I am pretty sure that the plumber who helped us install the vent replaced our cast iron pipe that went through the roof with a PVC pipe, and I am sure that it is exposed to direct sunlight. Is there anything I should do to replace it or cover it?

Thanks again for your help. This problem was driving me crazy.