Central Heating Pipe Routing

[RobH71]

I need to extend my central heating from my newly built extension into the old part of my house. On the first floor I need rads in the three bedrooms and in the bathroom, utility and lounge on the ground floor.

Is the below ok as a route? It appears best to me to as the joists run as the lines on the paper.

My flow and return come from the extension are 22mm so should when I tee off should I keep running 22mm and just reduce to rads ?

 

[Elkato531]

If the joists span the whole width as shown and you are wanting to cut notches for pipes, then there are building regulations about where the notches can go and how deep they can be. The middle of a span is not acceptable.

 

[Iddy]

I'd go with 22mm to the first pair of tees on your diagram, then 15mm from there on.

 

[RobH71]

Thanks for the reply I am aware of the regs around notching and drilling but either way I do it the joists will need one or the other. My main concern is around the routing and if I should be at 22 or 15mm.

 

[RobH71]

Thanks Iddy what is the thinking behind this?

 

[trojanhawrs]

Thanks for the reply I am aware of the regs around notching and drilling but either way I do it the joists will need one or the other. My main concern is around the routing and if I should be at 22 or 15mm.

What he's saying is you can't run them down the middle as pictured.

6.4.18 Notching and drilling NHBC Standards 2021

nhbc-standards.co.uk

Edit - To be fair your picture is slightly offset (whether by design or not I don't know). Dimensions would make it clearer.
Drilling is preferable IMO, can get away with a bigger hole for lagging. Won't affect the floorboards when the heatings on either.

 

[RobH71]

Sorry guys I am confused why I can’t run them down the middle? Which ever route I opt for will mean drilling or notching.

The length of the run is about 5m’s and then from each T to rad is approximately 2.5m’s

 

[Notch7]

Sorry guys I am confused why I can’t run them down the middle? Which ever route I opt for will mean drilling or notching.

The length of the run is about 5m’s and then from each T to rad is approximately 2.5m’s

Rules on notching / holes

If doing in copper you will need to do notching

If doing in plastic you can do holes

Personally I wouldn’t use plastic for heating

 

[trojanhawrs]

No reason you can't run copper through holes other than practically. You need access from one end and the holes need to be very straight.