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Old 12-01-2009, 04:08 PM   #1
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Gas smell from new basement shower


Hello. 4-5 months ago I finished off our basement (a 2-story home that was built in 2007). The builder had all basement plumbing roughed in for me, including venting. I added a shower, toilet and sink.

I have, however, noticed a gas smell only when the shower is running. There's water in the p-trap (therefore no smells at any other tiem), and no other fixture produces the same smell when ran.

Since this is all newly done and has yet to be fully used as a shower, I do not believe it would be bacteria of any kind. When I've run water to investigate, I've always checked before hand to make sure there was water in the trap. My thoughts are that there's enough back pressure that when water runs through the trap, the pressure from the gas pushes through the trap and is released back through the drain. Perhaps my venting is clogged? However, no other fixtures in the entire house, some of which I presume are also tied to this vent, have this problem.

One thing to note (not sure if it's related): I have noticed that when I flush my toilet, a small burst of air is released initially in the bowl, causing a couple bubbles. Though this doesn't cause a foul odor - though the elements being flushed down often do!

Any recommendations? Thanks in advance.

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Old 12-02-2009, 05:28 AM   #2
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Gas smell from new basement shower


It does sound like a vent problem to me. When you have a clogged vent high water usage devices, dishwashers, washing machines, and showers will suck air from adjacent "p" traps and allow sewer gases to escape. In your case the basement shower is the lowest point in your system and if it is straining for ventilation the trap isnt working and the closest thing to get air from is the drain line to your sewer system, while the shower is running. The burping toilet is the clincher. It is burping because of a lack of ventilation also. Your vents need to be checked for clogs. They can generally be cleared from the roof by use of a long auger or a high pressure garden hose, but if you are the least unsure about climbing around on your roof or which pipe is the vent, call a local licensed plumber.

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Old 12-14-2009, 07:46 PM   #3
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Gas smell from new basement shower


OK, did some more sleuthing, and it's not the drain at all...it's actually the water coming out of the shower. I ran some water into a cup, and the first bit came out discolored and definitely the smell. Second glass full had some discoloration, and some smell and with each glass I filled the water got clearer and smelled less (did about 5 glasses in total).

I've never had any problems like this in the past with any other faucets in the house, and no other fixtures in the bathroom have the problem. I am thinking it must be something in the actual shower fixture itself that's causing the problem...any thoughts as to what I can do to get rid of the smell?
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Old 12-15-2009, 12:09 AM   #4
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Gas smell from new basement shower


By chance is the water that smells from the shower the hot water?
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