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First fix pipe size?

View the thread, titled "First fix pipe size?" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi, I'm about to pipe up my upstairs cold water to sinks and showers.
It's a large 4 bed house, stopcock in the kitchen, middle of house outside wall, presently with 25mm pipe into a tap for building water.
So upstairs sinks and showers are piped with tails hanging down in 15mm JG speedfit. Supply pipe will be in ground floor ceilings.
So decision time, what's best practice?
Do I continue with 25mm pipe and T off at each tap with 25-15mm T?
Do I send one 25mm pipe to one side of the house and another to the other side or do I run one pipe and T off where needed?
I would like to avoid lowering the pressure too much if two taps are in use, it's an old farm at the end of a long main at 6 bar but not massive flow.
Finally whats the best practice way to clip pipes above a ceiling, is there a standard pipe clip distance?
Cheers all.
 

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