Hi, Hopefully a nice easy one. I am moving a radiator from one wall to another one. What size hole should I be drilling for the pipe to pass up from under the floor to the radiator? I can't look at the old holes because the floorboards have been notched then put in place after the plumbing first fix when the house was built. I just want a nice tidy hole that is not too big or small. 15mm is the obvious answer but no room for expansion if some is needed. Thank in advance.
I'd agree with 18mm, but you have to make sure the centre of the hole is exactly (left to right and front to back) under the centre of the valve to which the pipe will be connected. 1.5mm in any one direction off centre doesn't allow for much adjustment.
Pipe would most likely squeak when hot if you stuff it through a 15mm hole, go with 18mm, allows for movement. 15mm augers readily available,as is spade bit, got a 15mm stubby one here. https://www.orbitalfasteners.co.uk/...gle_shopping&gclid=CMT2oZ_Ux9ICFRG3GwodBNcAYw
The bigger the hole the more play the pipe will have. This will help to keep the pipes straight, left to right and front to back. It will also help when the radiator needs to come off the wall at some point. It can be a pain when the valve won't slip off the tail when removing a rad. I'd go 18-20mm if the floorboards are hidden.
Hi All thanks for your help. Think I will go with Mike83 and make a 20mm hole as floorboards are hidden by carpet and gives me some room for movement as I'm not a plumber so I expect I will need some. Much appreciated.
I imagine that ones the pipes are in place, you could fill around the pipe where it comes through the floorboard with caulk or silicone of some sort. Otherwise you'll get dirt coming through and staining the carpet. Or use a bit of pipe insulation cut to size, or pipe lagging etc.