depth to go with 10mm pipe in floor

[marlb]

I am going to add a radiator to the downstairs but the floors are solid and I will have to run plastic coated pipe under the floor. Can someone tell me how deep I need to go with 10mm pipe and how far apart does the feed and return pipes have to be from each other under the floor?

 

[Andygasman2010]

Just enough so that they're covered will do and they don't need to be apart.

I'd channel around the perimeter of the rooms and use plastic ducing, and 15mm pipe.

 

[marlb]

Thanks for your reply andygasman.
I take it you mean run the 10mm plastic covered pipe through the 15mm pipe. Is that what you mean.

 

[Andygasman2010]

I meant bare copper 15mm pipe in plastic ducting.

 

[marlb]

My system is micro bore and all in 10mm. Should I use 15mm pipe from 20mm feed up to new radiator and then reduce to 10mm??

 

[Andygasman2010]

Sorry, I assumed you were repiping your whole house. You're right, use 10mm to match the rest of your system. 10mm kutalex is fine, the flow/returns don't need to be apart and cover them with mortar making sure not to toch any bare copper with it. I'd say an inch of mortar would be more than adequate.

 

[marlb]

Thanks again.

Will get on with it!