Foul odor coming from upper kitchen cabinets
- Thread starter RayBliss
- Start date
The odor most likely is not coming from the upper cabinets.
Below the kitchen sink is an air admittance valve. Sometimes they fail and allow sewer gas into the coach. There should be one located below the bath sink as well.
Wrap a baggie over the valve and seal it with a rubber band to test it. If the odor then goes away, replace the valve. They are not expensive and can be found at any big box building center.
Also, up on the roof if you are comfortable going up there, remove the mushroom vent caps to check the seal between the vent pipe and roof. This can be a source of unwanted odors.
Peace
Dave
Below the kitchen sink is an air admittance valve. Sometimes they fail and allow sewer gas into the coach. There should be one located below the bath sink as well.
Wrap a baggie over the valve and seal it with a rubber band to test it. If the odor then goes away, replace the valve. They are not expensive and can be found at any big box building center.
Also, up on the roof if you are comfortable going up there, remove the mushroom vent caps to check the seal between the vent pipe and roof. This can be a source of unwanted odors.
Peace
Dave
Thanks Dave! We aren’t seeing any valves. Looks like a solid sewage pipe going up in that wall behind the sink and the upper cabinets we’re referring to. As far as up on the roof, when we take the caps off there’s a piece that’s flush with the roof so we don’t see anything needing sealing. Hmmm
jmarnell
Well-known member
For situations like this, I bought an inexpensive inspection camera - the lens is on the end of a 16 foot long stiff wire and can be used to inspect inside pipes, walls, or other tight places. With something like this you could scope out the inside of the vent pipe to see if there is a problem. Here's the link to the one I bought on Amazon - only $43 and already has helped tremendously! https://www.amazon.com/gp/product/B0888S8ZSN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
SLO
Well-known member
Look where the vent pipe comes out of the roof. Assuming the vent pipe goes straight up. Look inside and outside vertically below the vent pipe to see if there are any screws, nails, what ever, penetrating the wall below the vent pipe termination. Also, remove vent cap from roof and look down vent pipe to see if there are any foreign objects penetrating into vent pipe. Trick: Don’t use flashlight. On a sunny day when sun is at a good angle, use mirror to shine sunlight down into vent pipe. You’ll be able to see all the way down vent pipe. If you see something then you will need to cut into wall. The camera is also an excellent option.
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Are you certain you don't have one of these? Did you get down on your hands and knees and look with a flashlight?
Sometimes they are missed.
Peace
Dave
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travelin2
Pennsylvania Chapter Leaders-retired
Good luck on your quest. However I’m inclined to think you have a dead rodent if the smell is up high as you describe. Sewer gases are “heavy” and tend to be low along the floor that’s why others have questioned the studor valve typically found in the sink cabinets. Being unfamiliar with a RW though I guessing no island? Your sink is along an outside wall with a direct vent? If so, as I said, dead rodent
JohnDar
Prolifically Gabby Member
Perhaps, but my experience with dead rodents is they have more of a sickly sweet odor, not a rotten egg (H2S) fragrance. You might want to get a gas detector and check your propane fittings as part of your investigation.
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