On Thu, 05 May 2005 15:19:12 -0400, someone wrote:

THAT should not happen. If you need to run pipe such that
there's a low loop in it, there should be a
drain of some kind at the bottom of it.

I'd wager it happens more often than you seem to think. I'd say the
average house is just not piped such that being able to gravity drain
the pipes is a controlling consideration. And after the pipes are
roughed in, the walls are sheetrocked and the pipes are covered; no
drain points. Maybe a small house intended to be "seasonal" is set up
so the pipes can be easily drained, but the average house is never
expected to freeze inside.


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