I have never used PEX, but I understand it will survive freezing water. Is
I had a 3/8" soft copper pipe freeze and burst. A plumber put it in a
couple years ago when he installed a dishwasher. There is a dip in it where
it goes under a joist, so when drained my pipes last fall water pooled in it
There is no particular reason it shouldn't happen again; I am surprised it
didn't happen the previous two years. However getting to it to work a drain
pipe would be a real pain. I could blow it out with compressed air, but
that wouldn't be so easy either.
Is it reasonable to replace it with PEX; without spending serious money on
tools. I only want one 3' piece. How would I attach it to the 3/8 copper?
PEX is better than copper but can still freeze and split.
Look here http://www.zurn.com/operations/pexrh/pages/home.asp
It can be attached with couplings to the copper. Most plumbing supply
stores carry PEX in 250' rolls but a local hardware store has it in 25'
coils. They also have the fittings. I used it for the first time a couple
of weeks ago and it save me a lot of aggravation compared to replacing the
copper that leaked.
Use the Qest on poly & PEX. Regular compression fittings will cut into
the plastic tubing enough to weaked it. Or you can use regular
compression fittings with plastic ferrules. Don't use brass
compression rings on plastic tubing.
The advantage to Pex is that it's flexible enough that you may be able
to drill through the joist and fit the pex through the hole so there's
no low spot. Whatever you do, you should try to avoid a low spot like
Around here some of the bigboxes carry something called "ipex aqua".
It's a sandwich of pex on thin aluminum; its chief advantage seems to
be that the fittings are tightened with wrenches, no special crimp tool
needed. The only special tools that are "mandatory" are a pipe cutter
and a reamer, each about $10. It has combination fittings for other
materials, including both sweat and compression ones for copper. I
bought a length of it for a small job like yours but haven't used it
Like regular pex, the literature suggests it may be slightly more
tolerant of freezing than copper but still cautions strongly against
letting it freeze.
Of course, you can do exactly the same thing with soft copper, too. It's a
little trickier, but certainly doable.
Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?
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