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Basement sewer smell/Plumbers info req'd. #5287937 12/07/19 06:03 PM
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irv Offline OP
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I might have posted about this problem before? In our basement in our laundry room we have a floor drain, which I assume most households would have, and we periodically get a sewer smell from it.
My routine has been to fill a bucket with hot water with some dish soap, vinegar, bleach, etc then dump it down the drain. I assumed due to lack of use, the P trap was drying out.

Today, looking further into things, I did some reading about a clean out hole and noticed the ones I seen all had a cap on them to stop sewer smells from coming back into the house.

In these pics you will notice ours doesn't but you can also see what looks like weeping tile inside this side pipe/clean out spot so I am stuck wondering what to do?

The floor opening drain is 4 inches as is the clean out hole. I am confused on this inner weeping tile and what it's purpose is?

What I am afraid of is, if I block/cap this hole and because of the weeping tile, will I be blocking something off? Could this possibly be from our outside weepers and could they possibly drain to this floor drain? I have never heard water draining into it but that doesn't necessarily mean it doesn't, does it?

So if this is just an inner weeper for some reason and it doesn't drain from here, what can I use to block/cap this off? My dilemma is both holes are 4" inches. Is there something that is available that I will be able to get down there, turn 90 degrees then cap this clean out hole off?

I've looked at a few plugs but because both holes are the same size, it is going to be difficult (maybe?) to get something down there to do this.

WP_20191207_18_06_07_Pro.jpgWP_20191207_18_06_15_Pro.jpgWP_20191207_18_06_31_Pro (2).jpgSewer.jpg

2017 Chevy Impala 3.6 L.
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Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5287949 12/07/19 06:23 PM
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PimTac Offline
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First off I hope you are not mixing vinegar and bleach in the same solution.

Is your vent pipe close by this drain? Usually it is. Make sure your vent is not obstructed.


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Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5287954 12/07/19 06:29 PM
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PimTac Offline
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Is this the cap you were referring to?

https://www.plumbingsupply.com/floodguard.html


2017 Mazda CX5
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Roki OEM filter.
Re: Basement sewer smell/Plumbers info req'd. [Re: PimTac] #5287957 12/07/19 06:32 PM
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irv Offline OP
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Originally Posted by PimTac
First off I hope you are not mixing vinegar and bleach in the same solution.

Is your vent pipe close by this drain? Usually it is. Make sure your vent is not obstructed.


No, one or the either, never at the same time.

Yes, the vent pipe is fairly close and I know where it exits the roof. I'll take a look down it tomorrow with a flashlight but if this isn't plugged/obstructed, I would still assume some sewer smells can come back into the house or else they wouldn't sell sewer clean out plugs/caps, would they?

Thanks cheers


2017 Chevy Impala 3.6 L.
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Re: Basement sewer smell/Plumbers info req'd. [Re: PimTac] #5287960 12/07/19 06:38 PM
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irv Offline OP
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Originally Posted by PimTac
Is this the cap you were referring to?

https://www.plumbingsupply.com/floodguard.html


No, I never seen that one in my searching.

I was looking at a few, including these.

https://www.amazon.ca/Danco-10839-P...&hvtargid=pla-368865212104&psc=1

https://www.amazon.ca/Liquid-Breake...&hvtargid=pla-338108141924&psc=1

https://www.acklandsgrainger.com/en/product/p/WWG1VNG8?gclid=EAIaIQobChMItaC1seek5gIVBIeGCh0w6weSEAQYBSABEgKOKfD_BwE&cm_mmc=PPC:+Google+PLA&ef_id=EAIaIQobChMItaC1seek5gIVBIeGCh0w6weSEAQYBSABEgKOKfD_BwE:G:s&s_kwcid=AL!3645!3!303439923728!!!g!545896089543!

https://www.amazon.ca/Cherne-270138...&hvtargid=pla-368616641207&psc=1

Last edited by irv; 12/07/19 06:39 PM.

2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5287974 12/07/19 06:59 PM
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PimTac Offline
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In the houses I’ve lived in with basements I never smelled sewer gas.

So I’m thinking it’s either the vent or the stack as some call it or the sewer outside is causing it. I assume everything flushes and drains well? No backups or clogs in the past? If you are very close to your neighbors ask them if they have a similar problem. It might be in the municipal line or one of your neighbors has a problem.


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Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5287976 12/07/19 07:02 PM
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PimTac Offline
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The first link you posted is what plumbers use to test the drain system for code inspection. The second one is good.

Tape some Saran Wrap over the hole. It sounds like you have no water drainage issues in your basement.


2017 Mazda CX5
Valvoline Advanced Synthetic 0w20
Roki OEM filter.
Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5287981 12/07/19 07:11 PM
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JTK Offline
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All the places I've lived and plumbing issues I've stumbled through, I've never seen anything like in your pics. Both your pics and the one with the plugged clean out.

Sorry if I missed it, but If the sewer gas you are smelling is coming from the floor drain in your pic, is this something that just began? Never did it before?


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Re: Basement sewer smell/Plumbers info req'd. [Re: PimTac] #5287983 12/07/19 07:14 PM
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Originally Posted by PimTac
Tape some Saran Wrap over the hole. It sounds like you have no water drainage issues in your basement.
Horrible advice!


99 Toyota Tercel CE 5EFE/C151
Re: Basement sewer smell/Plumbers info req'd. [Re: PimTac] #5287992 12/07/19 07:25 PM
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SouthDakotaDad Offline
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Originally Posted by PimTac
In the houses I’ve lived in with basements I never smelled sewer gas.

So I’m thinking it’s either the vent or the stack as some call it or the sewer outside is causing it. I assume everything flushes and drains well? No backups or clogs in the past? If you are very close to your neighbors ask them if they have a similar problem. It might be in the municipal line or one of your neighbors has a problem.



In my finished basement, we have a bathroom we never use. After a week, if you don't use the sink or run water in the shower drain the water in the p trap evaporates and it smells like sewage. If I run water in them for around 20 seconds
we are good for another week or so.


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Re: Basement sewer smell/Plumbers info req'd. [Re: JTK] #5288005 12/07/19 07:36 PM
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irv Offline OP
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Originally Posted by PimTac
In the houses I’ve lived in with basements I never smelled sewer gas.

So I’m thinking it’s either the vent or the stack as some call it or the sewer outside is causing it. I assume everything flushes and drains well? No backups or clogs in the past? If you are very close to your neighbors ask them if they have a similar problem. It might be in the municipal line or one of your neighbors has a problem.



My neighbor, about 8-10 yrs ago had some type of problem but I forget exactly what it was? I believe, however, it was also some sort of basement floor drain problem but I will have to ask him.
Everything flushes and drains well and we've never had any sort of back up/flooding problem.

I am not doubting your suggestions/advice at all but if this wasn't a common issue or could become a common issue, then why do they sell clean out caps/plugs for sewer gas smells? (Like in my last pic in my 1st post)

Originally Posted by JTK
All the places I've lived and plumbing issues I've stumbled through, I've never seen anything like in your pics. Both your pics and the one with the plugged clean out.

Sorry if I missed it, but If the sewer gas you are smelling is coming from the floor drain in your pic, is this something that just began? Never did it before?


This has been going on for quite a few years now but I can't recall, nor can my wife, if this has been happening since we moved in 18 yrs ago or not?


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
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Re: Basement sewer smell/Plumbers info req'd. [Re: maxdustington] #5288032 12/07/19 08:11 PM
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PimTac Offline
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Originally Posted by maxdustington
Originally Posted by PimTac
Tape some Saran Wrap over the hole. It sounds like you have no water drainage issues in your basement.
Horrible advice!




Why? It will give irv some clues if the drain devices that were linked would work. It’s temporary. If he spends money on a drain plug and the smell is still coming in then that is a waste.

Saran Wrap for a week should tell the story.


2017 Mazda CX5
Valvoline Advanced Synthetic 0w20
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Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5288033 12/07/19 08:12 PM
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edwardh1 Offline
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what should be used - antifreeze to not evaporate


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: Basement sewer smell/Plumbers info req'd. [Re: edwardh1] #5288054 12/07/19 08:39 PM
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KJSmith Offline
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Originally Posted by edwardh1
what should be used - antifreeze to not evaporate


Vegetable oil.

Re: Basement sewer smell/Plumbers info req'd. [Re: irv] #5288132 12/07/19 09:48 PM
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Farnsworth Offline
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I have a shower that hasn’t been used in more than two years. There was still a water seal in it not long ago. Maybe I better check it. Put the cheap plastic cap in the pipe that’s what they do for toilets when the drain is exposed until the new one is installed. Fits good and no more stink.

Never put antifreeze into a drain that’s so bad.

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