New build heating, pipe runs?

[Knappers]

Hi all,
I've always been a maintenance and small works engineer (ie retrofit)
So... I've been asked to do the heating in my cousins new single story annex and was after some advice on running heating pipework.

I've quoted for UFH but as money is tight I want to offer a price for rad's too.
She's going to want 15mm and from floor so what's the norm?

I would think normal 22mm to 15mm branches in plastic coated copper with joints wrapped would do the job?

Any advice is welcome
what options for wrapping other than Denso?
Is plastic better and how should I transition to copper tails?
How deep should screed be above pipes?
Pre insulated pipe??

Please help!

 

[Knappers]

Pls no "don't do friends and family!"
Been there, done it, got the t-shirt
Reluctantly going there again :mad2:

 

[Chalked]

If it's solid floor. They will be fitting insulation ( should be 100mm) you could run pipework in this layer before screed. Do it in copper, clipped pressure tested and insulated.

 

[Knappers]

Cheers
insulated with what?
how would you keep tails in place during screeding?
guess pipe doesn't need wrapping if DPM over top...

 

[joni os]

If contemplating UFH then insulation should be on top of oversite concrete. Plaster ceiling and walls then hang rads and connect to pipe runs buried in the insulation, no need for separate insulation except where tails exit screed. Lay screed last.

 

[Knappers]

makes sense so will prob carve out insulation and tape over, don't know if I trust the builders with shiny new rads...

 

[Knappers]

so can I do runs in plastic and tails in copper then?
can I use pushfit - doesn't sit well??

 

[tamz]

Copper in hair felt or pip plastic. Whatever turns you on.
Pipe laid on top of insulation in what will be the screed. Screed should be min of 50mm so plenty cover.
Best practice no joints in screed however you want to play that one but either way wet pressure test and leave it pressurised.
Get a bit 4 x 1" wood and drill holes at your pipe centres and fix to walls above screed level. Even the thickest screeder can't knock that out of position.