Pipe best used for joist floors

[Benny2513]

What pipe for plumbing Radiators and domestic do most plumbers use for upstairs with joist floors on new builds these days iv used copper and hep but resently bout a press but never tryied it on a 1st floor with joists is it viable to do it with the 16mm pipe and 20mm pipe as its not as flexiable as the hep to get through joists

 

[ShaunCorbs]

Mlcp for me 25mm main runs and 16mm to the rads

16mm Is about the same as speedfit the non lay flat stuff so easily thread 25mm you can thread through but recommend two people one to hold the coil and the other to thread etc