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PeterA

New Home, shower smells bad when dry.

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Had a house built 2 years ago by a Western builder. Within days of completion, I noticed one of the bathrooms, the one farthest from the tank  smelled terrible, starting late at night. The builder added a small 1/2 inch pipe off the storage tank for all waste to vent the fumes. Still happens. If not a lot of  water goes down the drain at night, it will smell terrible. The closer of the showers to the tank does not smell, and is rarely used. 

If I pour a bucket of water down the drain, the smell will hold off until the next day.

The two shower drains meet halfway to the tank, so why one and not the other is perplexing. How to solve the problem even more so.

The builder is the last person I want to contact. Any ideas? Digging up the pipes in not doable.

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There is many posts addressing this problem, suggest doing a search and review some of the comments, many comments are useless but in amongst it all is some worthwhile commentary.

 

Possibly a floor drain with water barrier could be the answer. 

 

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One possibility 

 

Residue water in the pipe - i.e. the pipe does not have a 'fall' all the way from the drain to the tank.

 

I had a similar problem a long time ago - had to rip up the floor. I found that the pipe had a sag in the middle .. water would lay there and after a day or two .. smell would come up from the drain .. Flush with clean water .. would go away .. but always come back ...

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5 minutes ago, Artisi said:

There is many posts addressing this problem, suggest doing a search and review some of the comments, many comments are useless but in amongst it all is some worthwhile commentary.

 

Possibly a floor drain with water barrier could be the answer. 

 

Yes a water trap on the drain would do the trick ... But my understanding is that they are not used that much in Thailand .....  

Edited by rvaviator
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may be worth installing one first .. before digging up everything ...

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4 minutes ago, matthew777 said:

You just need to install a proper "P trap" and your smells will go away. 

Not that easy in a Thai house with every pipe buried in the concrete below floor level. 

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11 minutes ago, rvaviator said:

Yes a water trap on the drain would do the trick ... But my understanding is that they are not used that much in Thailand .....  

Water traps on showers are standard in all the hotels I have used, bottle traps are the most common on washbasins. However the waste water plumbing is often not vented correctly. This could be one of the faults with the OPs problem 

Edited by sometimewoodworker
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Probably a water trap inserted at the drain point would fix the problem. Cheapest way to do it, unless the OP wants to keep pouring water down twice a day. I'd suggest a cracked pipe or leaking connection in the section from that toilet is resulting in sewer gases coming back. It would explain why the gas return is not instantaneous.

 

"The builder is the last person I want to contact". That's a clue in itself.

 

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10 minutes ago, sometimewoodworker said:

Water traps on showers are standard in all the hotels I have used, bottle traps are the most common on washbasins. However the waste water plumbing is often not vented correctly. This could be one of the faults with the OPs problem 

Maybe a house builder is a bit more 'relaxed' about things compared with a commercial hotel build.  If I understand the OP correctly .. two showers feed into the same drain .. but only one shower has a smell ..  Would not both smell if the if the venting was not correct ? Appreciate its hard to answer when not having seen the installation .. But something to consider.

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If you are on the ground floor .. Hack up the shower floor and install this type

 

image.png.70551011302f2baf7fa46a5abc3aad1d.png

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I always poured a little bit of laundry bleach into the drain, followed by a few liters of clean water.  It's a temporary fix, but pretty effective at reducing the smell.

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37 minutes ago, rvaviator said:

Maybe a house builder is a bit more 'relaxed' about things compared with a commercial hotel build.  If I understand the OP correctly .. two showers feed into the same drain .. but only one shower has a smell ..  Would not both smell if the if the venting was not correct ? Appreciate its hard to answer when not having seen the installation .. But something to consider.

While I didn’t say that it was the problem, there is a scenario in which it could be a cause. The showers that don’t smell could be siphoning the water out of the smelly shower due to inadequate venting.

 

Note I don’t say that this is a cause but it could be.

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The problem is with the plumbing. It needs to be vented. There needs to a vent that connects to the sewage pipe that leads to day light, above the roof line. It's called a stack vent.

cb192e172890cdd26026ecc4b67b7a21.jpg

 

The septic tank also needs venting. There needs to be an intake vent and an out take. about 3" in diagmeter.

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