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How does one do this or is it best not to?
Plastic better than copper or copper run in a sleeve of some description?
Sounds like a terrible idea to me. You can't put them very deep without weakening the wall and they if are shallow then they'll be easy to damage (but still hard to fix).
It's a method of last resort. I wouldn't recommend it.
If you can't go under floors i'd surface mount it in trunking
Ive done it, its fine, just messy. Cant stand surface mounted pipes! Just get special chisel bit for SDS.
From recent experience at my Mum's house. Pipes were set into the wall, small bore to radiator. Initially set in by her partner who has since started developing dementia, so he doesn't know where in the wall they went.
Radiator stopped getting any water/heat through to it, small bore needed to be replaced and flushing didn't help.
End result was new surface pipework run into radiator and a few months at the tail end of winter without heat in the most used room of the house. Also, new boiler and heat ex, but this wasn't related to the pipes in the wall. Apparently the BG insurance covered almost all of the cost!
Yeah, dont...
but if you must, not copper or protect the copper with conduit.
Maybe in the skirting is better? Ive done this for stone houses with no floor cavity to run pipes. looks OK, is a bit of a faff but not a big drama
https://skirting4u.co.uk/blog/post/how-to-use-rebated-skirting-boards-to-hide-pipes-from-view.html
Parents house had pipes in the wall from when it was built. Had to replace them as they had a couple of small holes from the plaster compromising it. So yeah if you do need to do it then pop the pipe in conduit.
This was copper BTW, don't know how plastic pipes handle it.
I’ve done a small stretch to a wall mounted towel rail in the bathroom. Used conduit, plastic pipe and then tiled over. Been fine so far, can’t see why it would be any less reliable. Just more of a pita if you have an issue. But it looks much better, your choice.
Perfectly legit to do it, I always get pipes hidden in walls on my jobs, external or boxed pipe work is not cosmetically pleasing in most situations.
Can use copper or plastic, prefer copper in walls though as the fittings are slimmer compared to push fit plastic stuff.
Copper is degrades in cement though, so make sure they are covered 100% in either denso tape or sleeved with lagging.