On Tuesday, July 30, 2013 8:05:15 AM UTC+1, dennis@home wrote:
> > Thermal expansion, sags all over the place when it's hot.
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> Copper sags if you don't clip it properly.
Plastic sags when hot however it is clipped.
Look up the coefficients of thermal expansion for copper tube and plastic tube.
I can only recall one copper tube that noticeably sagged. It was a very long external run, carrying condensate.
> > Bulky fittings look unsightly.
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> The fittings are the same as copper except for solder, you can use
> cuprofit and compression if you want.
Bulkier than endfeed.
> > It's not really suitable for installation anywhere visible. Mice. You
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> > can scratch it, dragging it through holes in joists and then find the
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> > fittings leak.
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> Compression fittings on copper leak if you are clumsy enough to scratch
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> the pipe.
Not like plastic. And scratched copper seals if soldered.
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> > You can't drag (half-hard) copper through holes in
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> > joists.
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> You can if the end is accessible and you line up the holes well enough.
Of course, why didn't I think of that!
You just need to drill a FOGB hole through the outside wall to feed lengths of tube in (seen that done)!
Or demolish your neighbour's house and drill a FOGB hole.
>
> > Oxygen permeable; the barrier layer is usually a surface
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> > coating and can get rubbed off.
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> Its a three layer extrusion on all the plastic barrier pipes I have seen.
Pex-Al-Pex. Most plastic tube isn't that type.
Standard barrier PEX tube is the same as non-barrier tube, except for the outer coating. Which can be rubbed off.
> You could recycle it, there doesn't appear to be anyone doing so.
As stated, non recyclable (bad). No scrap value (good, if you want to minimize the chances of theft).
You're just trying to pick holes Dennis to start an argument; you just come across as a silly twat.
Plastic is also much more resistant to freezing damage (but can split).