channelling pipework in walls connecting to a central valve head

[gibbi]

Hi all,

I've purchased 3 x vertical rads (H:1800mm x 600mm). I couldn't stand looking at the surface mounted pipes running from ceiling to floor, so I decided to bury the pipework into the walls.
I was advised to channel out a chase around 20/25mm in the wall, which I have done, this chase runs down the centre of where the radiator will be sited.
I was told to cover the pipes with celafelt 15mm/22mm pipe lagging and to hold them in place with a flattened piece of copper nailed into the block wall
I noticed that when I connected the central valve set to the rad, that the pipe tails (only 15mm in length), have to be exactly 50mm centre to centre and in line with the central valve.
I'm concerned that when the plasterer covers the pipework, and I replace the rad, that the pipe tails might move, even if it's only a fraction, they then won't line up with the central valve.
Would it be a better solution, to just cover the pipe runs with celafelt lagging and then cover the pipes, with PVC channel and leave the tails clear so at least there will be some movement when the plaster has dried? One problem is that the two 15mm pipe side by side (when connected to the central valve), are 75mm, is there an 80mm PVC channel?

Any thoughts or ideas would be appreciated. I will obviously sort something out over time but any short-cuts would be great

Regards

George

 

[Ollieg]

Get a small piece of wood ( ply MDF pine ) drill two 15 mm holes at the centres you require and slip over the pipe ends.
This will hold the centres you need. Sometimes you can even screw th wood to the scerting board to keep your levels. Excuse my spelling.

 

[stevetheplumber]

leave them long solder a length of pipe across them then cut back after