On Sat, 11 Jul 2009 17:18:07 -0600, Tony Hwang
wrote:

lagman wrote:
I noticed a water bubble on my bedroom ceiling, so I went in the attic
to investigate. It turns out a pipe that vents to the roof had become
disconnected at the first joint, so I just re-connected it. I assume
when it rained hard enough, rain water was leaking down the pipe and
on to the ceiling (we just had a hard rain).

But that got me thinking.. Even if the pipe didn't become
disconnected, should rain water still be leaking down the pipe?

Thanks,
Dan
Hi,
That sounds ??? that kind of pipe is joined male-female fashion allowing
expansion, From bottom up F-M-F-M... Disconnected? More likely flashing
problem?
Huh? I guess the OP just imagined seeing the pipe disconnected and
reconnecting it.

Regarding his real question, any rain water that "leaks" down the vent
just goes into the sewer (as another poster cleverly said). If you
think about, even if it rains an inch, that's not much water compared
to lets say, a toilet flush.