Pipework for downstairs radiators on new builds

[Mgrant]

Hi on some new new build houses I plan to first fix the up stairs radiators in 15mm copper coming up though the floor at the pipe centers for the radiator. i,e rad. length add 45mm per side and the correct distance from the finish wall. However I am debating how to feed the downstairs radiators, this pipe work is usual feed behind the dot and dab plaster. What do people find is the best way of doing this. Thanks for any advice.

 

[Chalked]

10mm plastic coated copper for me. I like to bring the pipe work out at the correct centres for the rad.
Hate the plastic plates behind the rads and feeding the valves like an extension lead.

 

[Mgrant]

do you use plastic to go through the joist in the ceiling void then go to plastic coated copper to drop the pipework down in the dot and dab wall?

 

[Chalked]

do you use plastic to go through the joist in the ceiling void then go to plastic coated copper to drop the pipework down in the dot and dab wall?

Yes. Short price of 15, then reduce down to 10mm. Never be tempted to tee off 10mm, it won't work.

 

[Mgrant]

Thanks and this causes no problem with the upstairs radiators being feed of 15mm all the way to the rad?

 

[ShaunCorbs]

Thanks and this causes no problem with the upstairs radiators being feed of 15mm all the way to the rad?

10mm for downstairs rads and 10mm for up else it just looks wrong/odd or even better 15mm for up and 15mm for down

 

[Chalked]

None at all. Run 15mm right up to the point that you are doing the drop. Make sure the rest is sized correctly too.

 

[Mgrant]

hard to do 15mm for downstairs though with hiding the pipework in dot and dab?

 

[Mgrant]

Chalked, do you pipe your first floor rads, up in 15mm coming up through the floor? If using 10mm for downstairs rads.

 

[ShaunCorbs]

Chalked, do you pipe your first floor rads, up in 15mm coming up through the floor? If using 10mm for downstairs rads.

no he means get as close a you can to the rad and use a 15-10 reducer and go from there