Keeping radiator pipes in position when pouring floor

Poppy2

We have the pipework for our cast iron radiators running along sub-floor in our newly built house. Problem is we are soon going to be screeding floors so we need to keep the pipes in their exact position so that they don't move even a millimeter out of place when pouring concrete floor!
How does anyone suggest we do that?

johnjoe 123

i presume its plastic piping and copper risers coming out of the elbow or T. screw your valves into the rads and measure were your pipes will be centre to centre, then position them at this exact measurement and lag the risre with 1/2" lagging and fix to subfloor with galvo band. if u are a mm or 2 out you will get the play in the lagging.

Poppy2

Thanks John Joe we have used galvo band to keep the pipes from moving around on the sub-floor, but how do you suggest keeping the riser in the exact position without it moving so that the measurement remains the same out from the wall and between the pipe centers?

martin46585

as i my own case but for a towel rad, i used a 321 1/2" backplate ( the fitting used when fitting a tap to wall) and screwed it to the subfloor, ensuring exact centres and distance from wall, then screwed a 311 into it to take the rising pipe up to the rad, as long as your screed guys mind the fitting it should fine.
hope this makes sense...........

sullzz

when i used to fit pipework before the slab was poured i used to bring the pipe up at the correct measurement then fit a 4" soil pipe around it and fill it with sand (make sure you tape over the copper pipe so sand does not get into it ) , when your ready to fit the rads you just break the 4" pipe away , pipe the rad and just fill the hole with sand and cement , another benefit of doing it this way is that you can see the joint on the pipe below the concrete when you are filling the heating system and you dont have to fill this hole in until you want to , this system never let me down