Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.
I think I was a bit unlucky due to the prevailing wind direction but
wondered what others thought.

Cheers PJ

wrote:
Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

Well, measure the height of the overflow above the ground and the
diameter of the pipe itself, and the angle that said pipe subtends to
the wall. Then calculate the maximum volume of water per minute which
could emerge from the pipe, divide that by the viscosity of the water
and multiply by the square-root of the maximum wind velocity that the
pipe will be exposed to, then....

....on second thoughts, just extend it about 6" like everyone else.

TBH it shouldn't really matter if some emerging water does contact the
wall, because the pipe is only there for emergencies (ie to prevent a
flood if something fails in the cistern), and if you do ever see water
coming out, then it indicates that immediate action is required -
doesn't it?!

David

hi there,
put a plastic 'tee' on it so as the water will not runback to the wall,
because that can be not very easy to spot if it does that
regards
bob
wrote in message
...
Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.
I think I was a bit unlucky due to the prevailing wind direction but
wondered what others thought.

Cheers PJ

On Wed, 27 Aug 2008 17:25:53 +0100, wrote:

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.

Presumably a slow drip type overflow rather than a full flow failed ball
valve type. 6" is enough but it needs to slope down so that drip type
overflows don't run back down the pipe and into the wall. I think there
are regulations now about having a T piece on the end of the overflow,
partly to reduce airflow in/out of the pipe and presumably to mitigate the
shoddy installation of uphill pipes.


--
Cheers
Dave.

wrote:
Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.
I think I was a bit unlucky due to the prevailing wind direction but
wondered what others thought.

Change the siphon for a new one with an internal overflow.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk

The Medway Handyman wrote:

wrote:

Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.
I think I was a bit unlucky due to the prevailing wind direction but
wondered what others thought.


Change the siphon for a new one with an internal overflow.

I'm not keen on those, though we have 2 toilet water tanks with that
system in. Having worked in an industry that always used belt and braces
and something else to back it up, what happens if young child comes
along and uses all of the roll of toilet paper and the ball valve starts
to leak? This actually happened when I was site supervisor at the local
primary school. Thankfully the toilets were updated just before I left
the job, so that problem never occurred. A blockage was a regular event
though.

Just wondering, as we had the g daughters up for 2 weeks and went
through a whole rake of t rolls.

Dave

On Wed, 27 Aug 2008 17:25:53 +0100, wrote:

Hopefully an easy question, but I couldn't find an answer via Google.

How far should a toilet overflow pipe extend from an outside wall?
(to avoid any overflow coming into contact with the wall)

I ask because our toilet was overflowing and I finally noticed when I
saw mould on the inside wall - dammit.
I think I was a bit unlucky due to the prevailing wind direction but
wondered what others thought.

Cheers PJ

Thanks all.
As suggested it looks like the small flow of water combined with the
pipe being horizontal is what allowed it back onto the wall.
I'll stick a tee on the end.