Central Heating Pipework In A Screed Floor

[Leoki]

I need to extend the flow and return pipe from the main house heating into a new conservatory/extension at the back of the house. I plan to come off the existing 15mm copper pipework into 15mm Hepworth. The level of the floor in the extension needs to be made up, 100mm kingspan and then 100mm of screed on top and tiled to finnish. The pipework will be covered by the screed. Should i look to put the 15mm into another pipe to protect it or should it be okay if it is just covered by the screed ?

 

[Dannypipe]

15mm hep goes directly in the floor screed. However it should be pressurised so that it is expanded in the screed. I used a pumped tool. I'll try and find a link.

 

[Dannypipe]

[DLMURL="http://www.halebathrooms.co.uk/rothenberger-pressure-testerbrrp30-1856-p.asp"]Rothenberger Pressure TesterRP30[/DLMURL]

One of these mate. Didn't buy it from here though.

Oh and officially no joints in the floor. Though I've come across it before....and had to do it myself when another trade has punctured the pipe.

 

[Gray0689]

I need to extend the flow and return pipe from the main house heating into a new conservatory/extension at the back of the house. I plan to come off the existing 15mm copper pipework into 15mm Hepworth. The level of the floor in the extension needs to be made up, 100mm kingspan and then 100mm of screed on top and tiled to finnish. The pipework will be covered by the screed. Should i look to put the 15mm into another pipe to protect it or should it be okay if it is just covered by the screed ?

It should be lagged for heat loss as per building regs if just pipe
Or pipe in pipe but remember hep fittings are not permitted in a screed

 

[Leoki]

Dannypipe, thankyou. What pressure should i be looking to get up too.

 

[Leoki]

If i created a conduit in the screed for the pipework would that be better to allow the pipework to expand/contract and also be lagged, is there a conduit/trunking that i could be and then cut to section ?

 

[Gray0689]

Just get some hep pipe in pipe it's already in a conduit

 

[AWheating]

best to go pipe in pipe like the others have said, if you dont then make sure you let the screed dry correctly (dependant on compound)and increase the temp slowly to avoid cracking the screed. In the past for underfloor heating i have pressuried to 6bar while the screed was put down.

 

[Leoki]

Thanks to everyone who has responded. I have gone down the pipe in pipe route with conduit trays/boxes for the points where
Hep fittings at situated, in this case below where a radiator will be situated very shortly.

Thanks again everyone

 

[jase158]

just out of curiosity could you put pipe in 40mm or 110mm pipe, to allow for removal and replacement later on?probably wouldnt look too good and get a little noise when it moves. but is it possible, build regs, i.e.

 

[Gray0689]

You can put it in whatever you want if you got the room lol

 

[AWheating]

exactly the idea of pipe in pipe, so yes you could use say a 40mm conduit. I would not use waste pipe as bends would be too tight.

 

[sparra1100]

wouldnt even consider hep/speedfit/any plastic fittings if ye tiling over the screed ad use compression with inserts on the pipe cos when its cold ave seen plastic fittings split ye can then forget about it once pressure checked, i went to a house last winter all plastic fittings 30 of them split

 

[Gray0689]

Pipe in pipe to manifolds best way to do it no joints under floor