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Discuss New build first fix help needed in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. David Lowth

    David Lowth Member

    Have been sadly let down by a plumber and doing the first fix for a new build. I have questions regarding the correct procedure for chasing in pipework behind what will be dot and dabbed..

    Its 3 bed bungalow with 9 radiators in total.

    I was planning on running lagged plastic22mm flow / returns in the roof space to and tee off 15s for each radiator. Some of which are underneath windows.

    1. How deep do you usually chase when its being dot and dabbed? And do you also just take a notch out of the wall plate?

    2. Would you chase one larger channel and run both pipes in the same place?
    Does the plastic need to be insulated or ducted in some way so it could potentially be removed at a later date?

    3. The rads will be attached to chrome.. would compression fittings with liquid ptfe be ok to use to connect the chrome to plastic? But obvioulsy this wont be able to be removed at a later date without pulling the wall apart.

    4. How would you chase it in? Straight line down the wall with an elbow at rad pipe height?

    Finally anything else ive overlooked / missing? How would you usually approach this job?

    Thanks in advance for any help
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    How you going from chrome pipe to plastic ?
  3. David Lowth

    David Lowth Member

    Was thinking Brass Compression fittings with liquid ptfe.. i havent had anything leak with that stuff i think its great

    Or does it have to be copper and soldered behind dot and dabbed plasterboard?
  4. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    You’re going to have joints galore in the wall from what you’re saying
    • Agree Agree x 1
  5. David Lowth

    David Lowth Member

    Yes at least two per rad at a minimum which is why im trying to get advice from a professional on how they install in this situation? Or if this is acceptable?

    Looking at the building regs document G i havent been able to find a clear answer yet.. but it is a long document..
  6. scott_d

    scott_d Plumber GSR Top Contributor!!

    Chrime straight into the rad valves?
    I would avoid compression in the wall
    • Agree Agree x 2
  7. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Nope on compression in the wall
    • Like Like x 1
    • Agree Agree x 1
  8. David Lowth

    David Lowth Member

    Can you use 10mm plastic pipes into a junction box directly behind the rads?

    Just seen someone suggest this. Then there would be no joints in the wall?
  9. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    • Informative Informative x 1
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Yes you can but make sure everything is sized/designed properly. Microbore can be problematic
  11. scott_d

    scott_d Plumber GSR Top Contributor!!

    If it’s dot and dab do you need to chase the wall?
    Put a pattress behind rads
  12. David Lowth

    David Lowth Member

    That looks great, thanks very much. And then just go plastic all the way into the rad valves?

    I wanted to conceal as much pipe work as possible and not have any plastic on show..

    Yea i get what you mean on 10mm.. i would rather use 15..

    Can you get these for 15mm pipe?

    Sorry if i sound like a complete moron. Im not the whole time i swear. I just had to look up what a pattress was..

    So if the pipes terminate in a patress behind the rads, the dot and dab board just goes to the depth of the patress?
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    No they don’t do them in 15mm
    • Informative Informative x 1
  14. Rob Foster

    Rob Foster Top Contributor!!

    Maybe you can explain the contract you established with your contractor. Show us the detail then we can see what has been achieved and crucially what has not. Have you paid any lolly up front or any part payments and if so for which part of this work which has been completed and to your satisfaction etc
    regards Rob Foster aka
  15. David Lowth

    David Lowth Member

    The issues with the contractor is he was given £3500 in october by my business partner.. unfortunately without my signoff as i was out of the country.

    My business partner was told by the builders he needed to get the plumber on site asap to sort the first fix stuff before the floor went down. The builder went ahead and did this himself in the end. The plumber was supposed to have the first fix in place by three weeks ago. Then he failed to answer calls / return messages since then, would eventually get a response after days of voicemails. When he was supposed to be coming.. oh he had a hospital appointment, or a problem with his phone.. etc

    Basically he has very terrible communication skills and only after saying hes taking the **** today, and at my wits end i said just give us the deposit back ive had enough, he has said to my business partner he recieved a aggressive message from me and acting all confused and innocent, saying he could do the first fix by 28th march..

    Thats too long, and holding everything up.. so asked for the deposit back.. which is likely to be a whole another problem..
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