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the magic words are "if installed correctly". as with most things if installed well it will last well. all ill say is clips, clips and clips.
 
If I have to use plastic under floors I tend to join it using regular compression fittings.

On the moors where people have private water supplies fed from springs, I do all plastic as the water is very agressive and copper rots away rapidly. Water cyinders have to be stainless.
 
Both very valid points.

If I'm piping something up, I take the attitude that it should last forever under normal conditions.
 
when I started on my own was within a year of when my granddad retired and I still have customers on my books where I replaced like for like bathroom ect that he piped 30/40 years ago you may need the od imp to metric converter but I am more confident with his 30/40 year old installs than I am of plastic but that's just me!
 
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Use whatever material is going to last better & with no risks if possible.
If the water isn't corrosive to copper, then use copper for plumbing & always copper for heating.
There is no real saving in cost for a bathroom to be done in plastic surely, - unless a lot of time was saved?
The plastic pipe will save very little, the plastic fittings will cost more, then you need inserts plus clips. As to plastic needing less fittings - usually I notice every bend done in plastic has to have a 90 degree push fit & instead of an offset (like on copper) guys need two push fit bends!
A good plumber can install copper fairly quick & the soldering will add time - but 10 soldered joints in a bathroom ain't going to take too long?
 
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in a bathroom I 1st fix install all pipework clips then pipe it fluxing all fittings as I go so everything terminates into a full bore iso then solder everything in one go I don't think it takes anylonger as if your using talon clips you need to add spacers for speedfit if the are ran in parallel i and it looks nicer in copper but each to there own I guess
 
Its called modern plumbing. Some love it some hate it. Like many other things in the world, this trade is becoming de skilled. Btw i hate it. Most times it looks like a dog peeing in the snow unless it is properly fixed which it never is, but it can be useful. It does the job.

I hate the stuff to extreme. The only time I use it is if one of my colleagues (with whom we normally share big project jobs) calls me to help him with a Central Heating Installation and ofcourse, he is fitting with push fit 'rubbish'.
 

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