Best way to run pipe work for radiator

[Duke of Kidderminster]

I need to move a radiator back under a window where it used to be, previous house owners moved it. Trouble is that the floorboards run underneath a fitted wardrobe so I can’t pull them up. Can anyone suggest an alternative way to get the piping under the floorboards and up through this hole?



Piping will run parallel with joists so no problems there. The pine unit in the photo moves out of the way, just the white wardrobe can’t be moved.

[Mr Pointy]

What's below? Can you cut access points in the ceiling & repair afterwards?

[Duke of Kidderminster]

Can’t do that I’m afraid as I’ll be executed for messing up the new ceiling downstairs...

Wondering if I could run flexible piping and somehow work it through the hole then fix to radiator. I can pull a floorboard up about a metre away from that hole. And the rest of the run up piping I have access to.

Would flexible plastic piping be a huge mistake?

[Mr Pointy]

How deep is the void & are you trying to get one or two pipes up that hole? If the joists are 6" deep could you could bend 4-5" up on the end of a pipe & feed it in from the access point so it pops up out of the hole? You'd end up with a join above the floor to extend the pipe on but that might be acceptable. I'd be tempted to bend the pipe under the floor rather than use a coupling so you couldn't get issues if the joint failed.

[Lord Flashheart]

Use some Hep2O pipe with a copper stabbing out of the Hep elbow. The stabbing just needs be be short enough to allow you to slide the whole thing between downstairs ceiling and the floor.

[Duke of Kidderminster]

Thanks both.

It’s a probably more like a 9” void down there. I need to run two pipes that’ll go parallel through runs between the joists.

I’ll look into your suggestions

[Jambo85]

If you could tolerate making the hole in the floor bigger that would obviously help you greatly. You could then use one of those donut things to go around the pipe and hide the hole as you would on a tiled or laminate floor.

[Busterbulldog]

Cut the floorboard.

[Peanut Gallery]

I know microbore is the devil on PH, but...

My old flat has one large rad fed by a microbore pipe. There is a large 15mm pipe close to it, then the last bit we could only get a much smaller bore pipe through the available areas. It is plastic, and is surprisingly flexible, I would say you could get it through and up to where you need it without breaking more up. - I think this was the 10mm Speedfit pipe https://www.screwfix.com/p/jg-speedfit-coil-bpex-b...

My current house has microbore feeding all the rads downstairs, no problems, but I have got a magnaclean filter and the system is treated (X100). This is the 8mm copper microbore.

So, in summary, I think if you can get a piece of 10mm speedfit pipe through the gap I would say go for it with that, failing that some 8 (or 10) mm copper microbore.