Pipes for hot and cold feed under screed floor ?

[Donnapaddy]

Hi is this ok ,it's the grey flexible pipe with elbows on ,but the elbows will be below the screed floor as will grey pipe it has some sort of insulation on ot but this will not totally cover where the pipes connect.I ideally wanted all joins above surface .thanks

 

[simond]

When running pipes in screed would normally try to avoid any buried joints of any type. Furthermore, you are expected to run water pipes in a conduit when buried in concrete, you can buy 'pipe in pipe' for this very purpose.

Where we're putting in water pipes under a screed or similar, we run plastic pipes and if space is limited we use these to turn them upwards with no joints;
http://www.johnguest.com/speedfit/product/pipe-accessories/cold-forming-bend/

 

[Donnapaddy]

Hi thanks ,i mentioned denzo tape but he said this soft insulation is ok .I think k I will just pull the grey pipe higher up and the connections can be done above .do you know what piping is needed thanks

 

[Donnapaddy]

Does anyone know if the soft insulation the grey flexible pipe is in is ok ,or should it be in a pipe as it will be under a screed floor ,also the radiator pipes are exposed will these need to be protected from the screed thanks

 

[simond]

Copper radiator pipework has to be protected from alkalis in the cement screed, this can be done by Denso or some other form of separation.
Foam insulation is sometimes used but this doesn't guarantee the wet cement won't come into contact through joints, cracks etc before it sets.

With plastic pipe used for central heating there is no corrosion issue, neither is there a requirement to run it in a duct, although this would be considered good practice. As above, I don't trust pushfit joints to last 20 yrs, so we would wish not to have any buried in a screed. My views won't be the same as some other contractors, and my price is probably different to some, too.

If you were going to be picky about the methodology used for laying the CH pipes, the best time to form a specification is before you are getting a quote for the work. Someone who normally lashes it in, will be resistant to making changes mid process because they probably won't know, care or have costed what would constitute a decent job.

 

[Donnapaddy]

Hi thanks ,is the grey flexible pipe that has been laid for the cold and hot taps ok under screed .8t has some soft insulation sleeve round it .

 

[simond]

It's OK, but the water regs say that hot and cold services should be laid in a duct or tube. Yours aren't - seldom are.

 

[Donnapaddy]

Ok will call plumbers merchant and get the tube and do it myself. As for the radiator pipes is denzo tape ok or should it be some sort of tubing ,although tubing would be hard as there's lots if bends .I will be asking plumber for the coat of the tubing !

 

[simond]

I wouldn't advocate instructing the plumber from advice gained on an internet forum. And I especially wouldn't advise charging him for materials you have bought as a result.

If you go to your GP, he/she prescribes something, then you come back saying that a load of people who may, or may not be, doctors, have said he is wrong, don't expect a warm reception. Our trade is no different.

I would suggest asking your contractor about protecting copper heating pipes from concrete, and if you are feeling lucky, gently raising the pipes in ducts for water services question.

Better guidance than I can give (the layout is not clear from the photos) is attached below;

https://www.wras.co.uk/downloads/pu...eral/para_7_guidance_version_2_july_2014.pdf/

Your contractor should work to the standards described in the above document.