Replying to my own post. I know. What else am I gonna do with all the
noise going on? Even the cats are anxious.

In ,
SmileyFace wrote:
There's a loud humming noise

It's getting louder. I've followed the pipes all around the house; it's
worst in the concealed part between the landing floor and the kitchen
ceiling.

The mains pipe travels through the hall, up under the stairs, up the landing
wall into the loft and then down into the bathroom and loo. They descend
into the kitchen so I guess they come down from the bathroom.

It's a continuous unvarying tone; I've flushed the loo [no, the ball valve
is fine], run taps [they all work ok, no drips/leaks anywhere], even turned
the washer and dishwasher on and off and nothing seems to make any
difference.

I'll try to get some rest, but it sounds horribly like someone's using a
power sander in the next room.

Nobody here but me and the cats though.

--
Gill
more concerned