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PostPosted: Sun Jul 09, 2017 9:48 am 
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Howdy

About 2 months ago i came home to find my loft watertank over flow pipe chucking water into my garden. Changed the ballcock for a b&q one and all good.
Last week I started hearing the water tank filling all night and thought something was wrong in the loft. In the morning I found a different overflow coming from the upstairs toilet. Changed the ballcock for a b&q one and assumed that was the noise but it hasn't gone away

Before changing the toilet ballcock the loft tank was running. Now it's not but i can hear water rushing though the pipes. You can feel it's the mains pipe from downstairs by the stopcock and can also feel it at the loft tank inlet if you touch the pipe.

Can't find any leaks but most of the pipe is under floorboards and in the wall. I can't see the loft tank ballcock leaking but wod a small leak make a lot of noise in the pipes?

Any suggestions on what i can try? Possible that the toilet constantly filling left the loft valve open for too long and damaged it?


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PostPosted: Sun Jul 09, 2017 10:18 am 
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Have any of your toilets got an internal overflow that drains into the bowl?

Could one of the toilet flush mechanisms not be shutting off properly?

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PostPosted: Sun Jul 09, 2017 10:58 am 
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Both toilets have external overflows and the levels are fine. The loft tank doesn't appear to be filling but you can feel a definite yet slight vibration from the mains pipe leading into the tank.

Been reading about possible supply pipe leaks but would i feel it all the way in the loft if this was the case?

The pipes feel as though the water is going some, so if it was a leak I'd probably have noticed by now

Noise goes when stopcock is shut off

Noise started when the toilet ballcock failed but just won't go away. Perhaps the noise was there before but just got louder with the toilet issue and i never noticed but i find that hard to believe. Took me about a week to get around to fixing the overflow from the toilet


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PostPosted: Sun Jul 09, 2017 11:15 am 
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Have you got an outside loo? It's quite common to fix one leak (or ballvalve) which increases the pressure in the pipework and causes something else to pop.

You can narrow it down by finding out which pipes are off the mains and which are off the cisterns

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PostPosted: Sun Jul 09, 2017 11:36 am 
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Just shut off the outlet from the water tank which covers all taps other than the kitchen sink. Boiler expansion tank valve is stuck but checked the header tank and other than being full of muck is not overflowing. With the outlet valve off the noise is still there. Actually not as strong in the loft as it is by the stop cock but again i have seen no water flooding from the ceilings

And no outside toilet. I'm not that posh :-)


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PostPosted: Sun Jul 09, 2017 12:10 pm 
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If the noise is louder at the stopcock that would suggest a leak underground. I don't suppose you have a water meter fitted ?

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PostPosted: Sun Jul 09, 2017 12:37 pm 
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No water meter I'm afraid. The loudest part seems to be the upstairs bathroom but may just be the acoustics. No clue where the pipes run and don't really want to rip up all flooring and floorboards.

I'm going to buy a cap and whip the ballcock off in the loft and cap it off to see what changes


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PostPosted: Sun Jul 09, 2017 12:40 pm 
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There isn't another property fed off the stop is there?



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PostPosted: Sun Jul 09, 2017 2:52 pm 
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Turn off mains at stop cock and see if noise stops.

That will eliminate or prove all the cold mains outlets.

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PostPosted: Sun Jul 09, 2017 4:48 pm 
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There are 3 houses sharing the street supply. Just mine from the inside stopcock as far as I'm aware.

I shut off the stop cock earlier so am sure it's the mains pipe that's running as all noise stopped.

I've ordered an endoscope so will follow the mains pipe up the ceiling when it gets here and see what i can see. Will also cap off the water tank supply as soon as i can be bothered. Probably tomorrow now. Will update with results once done


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PostPosted: Sun Jul 09, 2017 5:59 pm 
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Get a big long screwdriver. Turn off the stopcock. Put the blunt end of the screwdriver to your ear, sharp end to the copper before the stopcock. If you can hear hissing the problem is a leak in the feed to your property.

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PostPosted: Mon Jul 10, 2017 5:52 pm 
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Turns out I can't just cap it off as i need an outer threaD
I'll save it for the weekend

Good idea with the screwdriver but obviously my stop cock is so inaccessible i can just about reach it to turn it off. We did have a leak about 5 years ago in the street supply but I don't recall hearing anything from inside

I'll wait for my endoscope and see what i can see. Still no sign of water anywhere so good news but part of me wishes there was water running down a wall just so i know where the problem is.


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PostPosted: Tue Jul 11, 2017 5:03 pm 
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Solved (probably)

Car is in the garage today so had to take a bus to work. On the way home i noticed a large puddle between my 2 neighbours houses. I went to investigate and lo and behold there was a substantial amount of water flowing up out of the floor. So we have a burst shared supply pipe which is probably causing the noise

Now just waiting for my "You have a leak" letter from southern water.

Many thanks for all help and suggestions. Finding that leak has put my mind at ease


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PostPosted: Tue Jul 11, 2017 5:56 pm 
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Don't wait for a letter report it to your water supplier.

Leaking water main could (worst case scenario) wash away a large amount of subsoil and even cause subsidence...

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PostPosted: Tue Jul 11, 2017 5:58 pm 
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As wine~o says, it needs sorting ASAP.
At least you have found it.


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