Occasionally smelly toilet/basin mystery?

[pkdays]

Hi all,

For the last few years I've been noticing a sewage smell that sometimes permeates my downstairs toilet. My house has two toilets, (at opposite ends of the house) one in the bathroom and the other in a very small cloakroom. It is the cloakroom that occasionally stinks - most often when I come to it there is no smell and at other times it stinks (and I'm not meaning the times after it's just been used!). I had the old toilet in there replaced on a plumbers advice as he thought it might be the wax seal (needed replacing anyway) but it did not fix the recurring smell. I have tried to work out a pattern of when it occurs but I cannot find one, it seems to be random. I have tried sniffing around in there but cannot locate the source of the smell. It seems a total mystery!!!

However, it occurred to me today that my cloakroom does not have a soil vent pipe on the outside wall (or any visible soil pipes) like my bathroom toilet does and perhaps the toilet is somehow venting into the room through the basin trap or something?

Anyone had this problem before? What should I do?

 

[pkdays]

Here are two photos of under the basin - just so you can see if anything's unusual or suspect?

 

[Nige F]

Buy more Oust . No seriously , change the trap for a Hep V O waste valve - you should just be able to get it hanging down and then go across to the standing pipe and connect with an elbow ( or tee like the existing) but lower

 

[CombustionGuy]

That trap it's pulling the seal out of the basin fit a anti syphon trap

 

[pkdays]

So you think that trap is the source of the smell? How can you tell? Is it not the right type of trap?

Am I correct in thinking that anti-syphoning traps have an air inlet valve after the U-bend? So what kind should I put in?

 

[Nige F]

So you think that trap is the source of the smell? How can you tell? Is it not the right type of trap?

Am I correct in thinking that anti-syphoning traps have an air inlet valve after the U-bend? So what kind should I put in?

a hep one because it stops air coming back and works like an anti vac too . How do we know the smells are coming from there - because we`re plumbers as to a wax seal on a wc - I think your plumber was looking @ U tube and a USA site

 

[pkdays]

In my photos does anyone know why the bottom section of the waste pipes are grey plastic (as opposed to white) and also, at the very back, the vertical grey pipe has a grey plastic screwcap on the top of it - what's that for?

 

[Terry7556]

the grey solvent weld pipes are grey because thats what the fella doing the job had in his van or bought to do it.
not sure about the screwcap but i think its a means of undoing in order to get access for inspection or cleaning. very sensible if it is.

 

[pkdays]

Thanks guys you've all been so helpful!

So would something like this anti-syphon bottle trap work?

http://www.screwfix.com/p/mcalpine-anti-syphon-bottle-trap-32mm-white/37314

And like Nige F suggests, also put in a self sealing waste valve - like this

http://www.wickes.co.uk/32mm-Self-Sealing-Waste-Valve-BV1/p/227144

 

[Nige F]

You don`t need both - just the waste valve

 

[gasanstuff]

If you washed your hands after you used the toilet then the smell wouldn't be there.👍

Fit the self sealing trap and tell whatever smelly urchin who has been using it to wash their hands.