Hello to all. 
I'm installing new radiators and pipes.
Downstairs are all concrete floors.
Do I need to run 22mm pipes as near to all rads as I can and then reduce to 15mm?
Or, do I run 22mm under the joists and drop down the walls in 15mm?
Thank you.
I'm installing new radiators and pipes.
Downstairs are all concrete floors.
Do I need to run 22mm pipes as near to all rads as I can and then reduce to 15mm?
Or, do I run 22mm under the joists and drop down the walls in 15mm?
Thank you.
