Sewage smell in house AFTER drains have been unblocked

(16 Posts)
Coleoptera Sun 01-Dec-19 16:45:37

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Coleoptera Sun 01-Dec-19 17:59:24

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Coleoptera Sun 01-Dec-19 22:01:26

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Coleoptera Mon 02-Dec-19 11:52:52

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johnd2 Mon 02-Dec-19 12:58:21

No idea why noone else has replied but the gurgling is basically either a blockage in that part of the drain or the pipe has standing water ie going uphill.
I wonder if there is a further blockage in that area which needs dealing with.
The smell would be caused by the water in the trap being sucked through by the narrow gap beside the blockage. Either that or one of the traps is losing its water or dislodged.
Have you tried running just a trickle of water slowly down all the drains, to make sure there's not enough force to cause gurgling?
The final option would be either start pulling up floors or get a camera in from all directions.

johnd2 Mon 02-Dec-19 13:03:08

There shouldn't be any traps under the floor, and when you put a trickle of water in that would be a cup full in each.
The actual smell from an open drain is not caused by your pipework but basically anyone on the same run, the sewage is basically nicely steaming away in the pipe and obviously very smelly. The drains are all ventilated on people's roofs, so if the wind is blowing your way, the smell comes through.
We had an open pipe on our system while they were building our extension, and it was fine most of the time but occasionally we got the full benefit of the neighbours...

Coleoptera Mon 02-Dec-19 13:15:31

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PigletJohn Mon 02-Dec-19 15:57:50

I think you'd do well to get an experienced local plumber to take a look.

The skillset of dynorod workers may vary.

I incline to the view that drains should not get blocked unless you put toys, sanpro or cement down them, so there is probably a construction or damage fault. It may have been caused when the extension was put on top.

Haver a look behind your machine and photograph the waste pipework. There is often a standpipe for a dishwasher or washing machine, it should have its own trap.

Your soil pipes should have a vent. Usually it is a 100mm pipe that rises up the outside wall of the house (sometimes in a duct inside the kitchen and bathroom, boxed in) that is open at the top to let air in and out, equalising the pressure, and to allow and odours or gases to escape above the hight of your windows.

Bathroom fitters sometimes like to put a Durgo or similar valve in, which is supposed to let fresh air enter the pipe when there is suction, and supposed to prevent smells coming out. They don't always work well, and they may stick.

Coleoptera Mon 02-Dec-19 16:59:06

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PigletJohn Mon 02-Dec-19 18:02:51

photos might help

opening up the hidden cover will probably help. There could be a disused pipe under there or some other damage.

PigletJohn Mon 02-Dec-19 18:04:02

where is the soil vent pipe, and how high? If it is free and open, gases should be escaping up there, not into the house. Has he sniffed it?

PigletJohn Mon 02-Dec-19 18:05:49

I want to see the route the flexible waste pipe from the machine takes, on its way to the sink waste.

SofiaAmes Tue 03-Dec-19 02:53:35

I am such a plumbing nerd...I LOVE these threads. @PigletJohn if you ever want to take a family vacation in Los Angeles, I have a large house and plenty of extra bedrooms and would be happy to host you and your family if you promise to talk plumbing with me....smile

Coleoptera Tue 03-Dec-19 15:33:04

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PigletJohn Tue 03-Dec-19 18:25:27

when the waste pipe connects to the trap, does it then run downwards (so that waste from the sink can run down it) or does it loop up and touch the underside of the worktop, retained by piece of string, cuphook or something?

First rule of plumbing: flows downhill.

An experienced wrinkly plumber will have seen most of the things that can go wrong with domestic drains so may spot something. I'd suggest (if you can find one by personal recommendation) offering to pay for an hour of their time to rummage around.

I would not be surprised if there is a defect, dip, deadleg or something where dislodged detritus is collecting. But as you have an open soil vent, it's puzzling to know where else the smell is getting out.

Dfabs100 Sun 26-Apr-20 09:04:00

we have exactly the same problem. Wondering if this ever got resolved? And what the problem was...

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