Sink Waste Pipe leak

[dishman]

Hello,

Was in the process of retiring to bed when I noticed a dripping coming into the kitchen from the bathroom upstairs whilst someone was using the sink.

So after a few hours of ripping up floorboards in the bathroom, I have traced the problem to the waste pipe of the sink. It appears to have failed somewhere between the internal wall and the external wall.

What is the best course of action? It basically comes down from the sink, has a 90degree joint and then a straight section and out the wall.

I'm guessing trying to remove remove the straight section from the join and replace?

If the join is stuck with age (its been there for 35 years), Would it be ok to cut the straight section, and then put a connection on to join the old and new straight section?

---

I am pretty glad it is just the waste pipe as originally I thought it was the copper feed pipes.

Although, I hate to know what it has been doing to the cavity!

A lot of water was making it to the drain outside, but some seems to have been backing up and leaking internally.

 

[PrenticeBoyofDerry]

I would replace it completely, core a hole so the pipe goes straight through the internal and external wall, allowing enough fall for water to evacuate.

 

[longdogs]

It's ok to make a join but obviously you need enough pipe to get a new fitting onto it, once the old one has been cut off. If possible replace the whole thing. I am assuming the pipe is plastic.

 

[sooey]

It's not a fooking sink!!! It's a fooking BASIN!!!


right dick

 

[dishman]

Firstly, the term sink, as a noun, can be correctly used to describe:

"a fixed basin with water supply and outflow pipe"

Now that very important response is out the way....

Yes, thanks for the advice, I think I will just replace the whole thing as you say (from the ubend onwards).

The pipe has enough fall so I do not need to re-core a new one. It is already a straight run of pipe from the internal to external wall. I think a mouse may have got at it at some point. [/i]

 

[dishman]

It was a mouse!

Pipe removed and the little f***er has chewed the side of the pipe.

View media item 95145
Bought some new pipe from the Handyman shop.

On another note...

This new flowplast pipe seems to have far less substantial rubber seal at the joints.

The old pipe had a rubber ring and then a translucent ring which seemed to offer much more grip and resistance when pulling the bits apart.

Is this a quality thing or is the modern part just made to be easier to use?

View media item 95144 View media item 95143

 

[Hugh Jaleak]

Lucky it was the pipes and not cables, at best a dead mouse, at worst a fire! Hope you've caught the little blighter too.

As to the pipe, I suspect biggest factor is cost. Push fit stuff is cheaper (and a different type of plastic) to the superior ABS solvent weld waste, and simpler the fitting, the cheaper to produce.

 

[Madrab]

If the pipe is heading outside, then I'd recommend solvent weld pipe and fittings. Push fit and compression PVC is not as UV stabalised as ABS solvent weld pipe and fittings and not really recommended for exterior work.

You may want to make the hole through the wall slightly bigger too and encase the waste in metal sleeving if you can, to try and avoid pest damage in the future.

Oh and if there's anything worse than push fit waste, it's the cheaper push fit IMO.

 

[dishman]

Thanks for the advice. I will ensure to impliment it in the future when the house undergoes a full refub. I'll just for for easy option for now!

I am just happy to get the sink working again. The run of pipework that is outside is only about 20cm before it drops into the hopper. So I am not too worried about longevity for now.

Although the bath wastepipe was just below this one! I had a look and it looks ok, no sign of leaking but there was a light gnaw mark on one side...time will tell!.

Further Question....

How are the ABS solvent weld pipe and fittings superior? It sounds like you apply some form of glue at each pipe join and the plastic is more superior. Is that it?

 

[Madrab]

Solvent weld is indeed a permanent cement fixing procedure, therefore its seals and joints are the least frequent to fail IMO. ABS is also more durable than PVC being more resistant to UV therefore is more suitable when using outside and i find copes better with heat.

Don't get me wrong, PVC is fine and good quality compression is more than suitable for interior runs. Push fit though is easier to demount and can be pulled apart quite easily, therefore more susceptible to failures and leaking in my experience.

 

[longdogs]

Solvent weld is indeed a permanent cement fixing procedure, therefore its seals and joints are the least frequent to fail IMO. ABS is also more durable than PVC being more resistant to UV therefore is more suitable when using outside and i find copes better with heat.

Don't get me wrong, PVC is fine and good quality compression is more than suitable for interior runs. Push fit though is easier to demount and can be pulled apart quite easily, therefore more susceptible to failures and leaking in my experience.

+1

 

[dishman]

Thought i'd fixed it! Sink all fixed.

As a precaution I did a test on the bath and it appeared there was still a leak.

It seems that after dinner he went for some dessert on the next pipe.

This hole was only tiny in comparison to the first situated near the top of the pipe yet still enough to cause an issue.

Replaced the bath waste pipe too!