On Dec 9, 6:05*pm, "HeyBub" wrote:
Stormin Mormon wrote:
During the phase change from liquid water to solid ice, the
water (ice) expands. It can easily crack the pipe. So that
when the weather warms up, the drain trap leaks.

I don't believe it can crack the pipe.

As the water turns to ice it expands, true. But in a p-trap it's got PLENTY
of space to expand into (like millions of cubic feet) - in both directions.

Well as I said earlier the slug of water expands in all directions.
Not just the directions in line with the pipes. The pressure that
causes is more than enough to fracture stone so the piping has no hope
of surviving the experience. Every time the hunters have used the
toilets after they were antifreeze treated the toilets break and that
is just because the antifreeze is diluted with urine. When they are
also fastidious enough to use the sink the S trap breaks. So from
experience I can tell you that if the water hard freezes in the trap
it will fracture.
--
Tom Horne