Sewage smell since loft bathroom installation

[656786543]

We have just installed a bathroom in our loft conversion (2nd floor) and since then the bathroom on the first floor started smelling unbelievably bad. All I know is that they didn't put a soil pipe on the outside on the house but rather on the inside. The smell in the bathroom is coming from the shower only, not the tub or sinks. Our builder put One Shot drain cleaner in it which helped for one day only. The smell is so bad that it travels into the downstairs dining and living room, we can't even have guests over anymore without keeping the bathroom door firmly shut. Please help, this isn't normal and it severely devalues our house! Thanks

 

[king of pipes]

You have answerd your own question it needs venting to outside, the water in be trap or traps is being sucked out allowing smells to enter your property a few pictures of how it terminates would help. Cheers kop

 

[kozak1968]

Check the shower trap is complete unit and fits together correctly. They can sometimes distort and not form a seal.

 

[SimonG]

My money's on not sufficient vent. Sucking water out of shower trap. Need to see end of soil pipe in loft area. Durgo may fix it.

 

[Chalked]

Most likely, lack of drain vent.

But as above take the cover off the shower trap and see if there is a small bucket arrangement. With a tube that drops in.
Even better . Post a picture of the trap, with the chrome cover off.

 

[656786543]

Hi, thanks everybody for their input! I've uploaded the picture from the smelly shower (1st floor). BTW, we noticed it gets worse when we flush the ground floor guest toilet... Trying to wrap my head around how this can be but am clearly not a plumber...

 

[Stigster]

Run a bit of water into that shower trap to and get someone to flush the guest toilet whilst keeping an eye on the water in the shower trap. You will likely see the water either get pushed up out of the trap and releasing a stink with it, or conversely it may pull the water out of the trap and down the drain, thus losing it's trap seal effect and letting the sewer smells in that way. That would indicate a venting problem is likely.

 

[Chalked]

Hi it's missing the cover.your drain is open to the sewer.
It looks like an abacus shower drain. Give them a ring and see if they will supply you one.
Your missing the top bit of the pic.

Cyber Week Sale

 

[Stigster]

I had assumed (I suppose one should never make assumptions!) that the OP had taken that part off to let us get a look at what's underneath. However if that part is actually missing then you've solved it.

 

[656786543]

Hi all, thanks so much for your input. That part is indeed missing and I've emailed the company to see if they can send another one through.

Hopefully we'll manage to have a non smelly Christmas
I'll keep you posted!