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Extending 10mm copper microbore to relocated radiator

Discussion in 'Plumbing and Central Heating' started by Rob3D, 6 Dec 2020.

  1. Rob3D

    Rob3D

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    Hi. I'm beginning to regret taking on our bathroom remodel. In order to accommodate the bath in the only sensible location I have to move a radiator approx 1.5ft. I'm ok with a bit of copper soldering but the 10mm copper microbore feed lines are hidden about 8 inches behind a stud wall (in the cavity between the bathroom and the outside wall). I don't really want to brandish a blowtorch in the area behind the drywall so I'm looking for an alternative option. Due to the location of the pipes, one would need to be extended by about 2.5ft, the other could possibly be shortened and rerouted.

    Best I can come up with is to use some flexible plastic pipe and push fit fittings but never having used this before I'm not sure what would be best to use (?) Obviously any joints have to be 100% reliable and I'm thinking of changing to 15mm copper for the final connection to the new radiator.

    Any advice appreciated.
    Thanks
    Rob
     
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  3. Mr.B

    Mr.B

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    I've done much the same as you with 10mm within a stud wall and, as long as you've got a decent space around the area to be blown, I'd have thought you'd be OK. Especially if you use a blowlamp with a smallish flame. If need be cut the plasterboard back to enlarge the access (plasterboard is so easy to patch and make good afterwards) ... and have a fire extinguisher nearby (always a good idea anyway).

    In fact I would emphasize the fire extinguisher - or at the very least a washing up liquid bottle full of cold water ready to aim at any potential mishap .... one of those saved me from certain disaster once - but I'd prefer not to go into details - it makes me shudder to think about it :)

    Use a soldering mat too.
     
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  4. Rob3D

    Rob3D

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    Thanks Mr.B, not an advocate of converting a run from copper to plastic then? I had considered removing the entire section of drywall, might be the best option, all things considered. There's a lot of studs and even with the drywall gone access would be awkward.
    I've just inherited an old, but still serviceable, extinguisher from my office but it's powder - hope to god I don't have the use it - the mess powder makes!
    Cheers
     
  5. Dangee

    Dangee

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    I use 10mm plastic all the time.
    Cut the copper in a place where it is nice & circular. File/sand off any burrs use push fit. No problem whatsoever. Golden rule though NEVER tee off to additional rads with 10mm. Not enough output.
     
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  7. RobTi

    RobTi

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    Invest in a set of mini tube cutters to get a good cut, no filing and mark the depth of the socket of the fitting on the pipe, then you will know it’s on
     
  8. Mr.B

    Mr.B

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    No, not against plastic, especially if it makes you life easier. The only make of plastic I've used is JG Guest Speedfit and got on fine with it, it's just I kinda think a copper run is solid and entirely permanent, but that's probably a bit old fashioned.

    I urge you to get a decent extinguisher. Toolstation and screwfix have them and for the price of a takeaway meal they must, surely, be worth getting.

    https://www.screwfix.com/p/firechief-water-additive-fire-extinguisher-6ltr/34653

    https://www.screwfix.com/p/firechief-water-additive-fire-extinguisher-3ltr/97137
     
    Last edited: 6 Dec 2020
  9. RobTi

    RobTi

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    Word of warning you can’t use chrome pipe with push fit fittings in case you were converting back to 15mm for show, clean chrome off if you intend to use it
     
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  10. Rob3D

    Rob3D

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    Thanks guys. Don't worry, I wasn't thinking of using chrome pipe.

    I'm still undecided. I'd have to run copper behind 3 or 4 studs, that makes it difficult to install without making it into a bendy mess, possibly compromising the pipe. On the other hand, I've never used plastic before and an 'out of sight' job is probably not the best place for an initiation :-\ . I was considering the flexi barrier pipe to make it a bit easier in the awkward location, is this a sensible idea?
    Cheers
     
  11. DIYnot Local

    DIYnot Local

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