Believe it or not, I'm still dealing with the leak - since Nov. 2015! The same roofer, his son and his worker came over this past Sunday, went into an attic crawl space and now says the leak is from a pipe on the floor of the attic-ugh-and that I should contact a plumber. Here we go again. I have been looking on line (w/o luck) to find out what a pipe in an attic may be for? Would it be related to the heating system? Are there different types of plumbers?
They're definitely looking at a plumbing vent... and any roofer should know what it is.
It is possible the vent is pitched incorrectly and filling up with rainwater and has started leaking. But if that were the case, I would think you would've noticed plumbing issues such as slow draining/gurgling sinks... and judging by the work the roofers have done.. I'm going to lean towards a leak that's allowing water to run down outside of the pipe drip and into your hall. Any roofer should understand that water can run along joists and pipes and can actually drip a good distance away from where the roof leak is.
I had a vent was knocked out of kilter when I had my roof done and, after heavy rains they elbow fills up with water and my kitchen sink gurgles when draining ('cause it's sucking air through the trap instead of the roof). It's not the roofer's fault though. I didn't secure the pipe properly when I remodeled my kitchen. That was quite a few years ago.. and I've yet to see any leaking.
Thanks for reminding me I need to get up there and fix it this summer.