"Twayne" wrote

Good lessn learned, but at 24F, dripping faucets definitely would have
prevented the hard freezes. In fact, that would work to much lower temps
than 24. Actually, as long as there aren't drafts on the pipe anywhere,
it'll work down to near zero.

few sinks dripping, probably would not have helped this one.

Not so sure and thr plumber said wouldnt. It's due to the location being a
good 40ft away from the nearest sink and 20ft of it exterior to the main
house (and all heat) with no insulation at all in the roof over that area.
It's the deadf end section of a pipe where it split, not along a run where a
drip could be made.