Laying pipe in concrete?

[plumb_know]

Hi everyone,

I have a customer who needs a flow and return pipe run in their concrete floor for their hallway radiator. The current pipes are surface mounted but due them changing the position of the door they now need running in concrete. The only problem I am having is how to run it so I do not have any plastic pipe or a fitting on show in the hallway where it comes up out of the concrete? But do not see how I can do this and comply with water regs of no fittings under concrete? Any ideas how can do this but still do a clean and neat job?

Thanks

 

[MOSSEP]

copper pipe?

 

[plumb_know]

copper pipe?

I was going to use pex barrier pipe through 25mm conduit ducting

 

[lame plumber]

I was going to use pex barrier pipe through 25mm conduit ducting

so what is the issue with that?

 

[AWheating]

concrete or screed?

id just use copper, and protect it.

 

[jefaz]

Copper and some denso.

 

[townfanjon]

I would be tempted to sleave it, even if you use copper. But especially if its plastic running through it.

 

[MOSSEP]

Copper pipe covered in foam pipe insulation with taped joints, will give it good protection and insulate it.

 

[plumb_know]

Ok thanks, I was intending to use copper and just protect it but done some reading up and water regs say it needs to be easily replaceable, so thought this only left plastic option through conduit. But will go with copper option, would i Need to use a certain type of insulation that isn't porous? Otherwise won't the lime just seep through to the copper?

Thanks for your responses

 

[Ermintrude]

Get pre coated or use denso tape. Make sure you lagg pipes for thermal losses. Concrete will steal heat very quickly.

 

[plumb_know]

so what is the issue with that?

The issue with this is if I was to adhere to water regs of not having fitting under concrete I would need to have a push-fit or compression couple on show above ground in the hallway and don't really want that as doesn't look the best.

Thanks
vince

 

[plumb_know]

Get pre coated or use denso tape. Make sure you lagg pipes for thermal losses. Concrete will steal heat very quickly.

Thanks will do, would denso also insulate the pipe enough.

 

[Ermintrude]

Nope. Denso isn't a thermal barrier

 

[plumb_know]

Didn't think so, thanks ermintrude, been very helpful.

i will go with copper pipe and some armaflex insulation I think and just thoroughly test it before screeding.

thanks everyone

 

[Ermintrude]

Make sure insulation is 50mm below surface / minimum. Also armour flex won't protect pipe from lime that's job of preacoat or denso.

 

[jefaz]

Is plastic coated copper any good?
then armour flex?
cheaper with denso tho. I love denso me

 

[Ermintrude]

http://yorkshirecopper.com/our-products/kuterlex/

But need different guide / bender

 

[Leemckie91]

Wrapping it in denzo would do the job? and sleeve it.

 

[tomplumb83]

Don't do what a plumber near me did....
Lovely big house newly renovated. All ground floor heating pipes under newly tiled floor.
Plumber sleeved/protected the pipework with a plastic gas sleeve type thing. All pipework covered with it, must have been a nightmare to get on. Until.... leaks started appearing. A tile is removed to make a repair. When heating is put back on, another leak.... and so on for a couple of weeks! Turns out this sleeving wasn't letting the pipes expand enough and it was expanding on the joints instead. No idea why he did it the silly man, must have taken him an age to get it all sleeved. The whole of the downstairs had to be repiped - exposed this time, I think. Actually i wouldn't know as the buggers never had me to sort it

 

[Geyser]

As you said, I would use pex in conduit terminating at a box then copper or sleeved tails up to rad. Pipes replaceable as per regs! And looks good above floor.

 

[sheff paul]

just done a bungalow all pipes under floor,friggin nightmare left heating working for 4 days though before I densoed pipes,could not go for 10mm plastic as rads were too big..

 

[Ermintrude]

Some big bum rads? Can't u get about 7kw out of 10mm?

 

[plumb_know]

thanks for everyones help and advice, i have now done the job with copper, denso and pipe insulation. all went well,but found out just how messy and tricky denso can be to work with . i will try and put some pics up of the job so you can comment on it.

thanks again

 

[Ermintrude]

Get the denso hot, it's a real treat

 

[plumb_know]

Get the denso hot, it's a real treat

Haha yeah I found that out as tested it hot before screeding over pipes, had great fun trying to put denso round the joints I had left open after I had finished testing.