Plastic pipe that is exposed is a candidate for mechanical/physical damage, doesn't take much to put a hole/split in plastic pipe. Had to replace numerous rad tails that were run in plastic because they've been hit by a vacuum cleaner and they've split at the valve.
The ones I will be using will be behind some kitchen cupboards, as well as in stud walls, so won't be exposed. As I have to traverse 15m with a number of pipes through existing holes it will be a LOT easier to feed in plastic pipe from a large roll at this stage. Not to mention that it would be a lot faster, with far fewer fixings.
Trouble is they will traverse some other pipes. Already noticed they are flexible enough to just slightly bend around and leave them touching each other. But might not be advisable?
Long length of placcie through the wall- yeah loads easier to thread it than sweat lengths of copper. Once you get behind the units (assuming you have a service void) copper will be a lot neater and easier to form crossovers or whatever to keep clearance between pipes.
Pipes touching is never a good idea- can lead to noise, unwanted heat transfer, leaks.
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