Something smells awful! Dead animal in wall? Help!

sarah2008October 12, 2008

Every so often, we get a very bad smell always coming from the same place. It seems to be in an unused upstairs bathroom. It comes on suddenly every few months - within a day is TERRIBLE - stays bad for a week or so and then faces away. I have tried pouring water down every drain. No impact. I think it may be animal getting into wall and dying. The bathroom has 2 exterior walls, one of which is party wall with the garage.

Is there any way to investigate the animal theory without tearing out the wall. We definitely live where anything from a mouse to a possum might seek refuge in the winter. I never hear an animal scratching but we have found evidence of mice in the attic and basement. The dog doesn't seem to pay attention. It seems like it *might* come from a heating duct in the bathroom. It is always in the same area. It smells stronger than a sewer smell when it is a fresh occurrence (it is awful) then it will go away for months, then 3 or 6 or more months later it will reappear.

Thank you for reporting this comment. Undo

if the smell is coming out of a duct, then maybe you have somethign dying in teh attic close to teh duct and that is where the smell comes from. it does sound like something dying since it goes away in about a week.

    Bookmark   October 12, 2008 at 9:11PM
Thank you for reporting this comment. Undo

"Every so often, we get a very bad smell always coming from the same place. It seems to be in an unused upstairs bathroom. It comes on suddenly every few months"

I seriously doubt that animals come into the house every few months to the exact same wall for the purpose of dying. Way too coincidental for me....

How is the bathroom vent and the toilet's wax seal?

    Bookmark   October 12, 2008 at 10:31PM
Thank you for reporting this comment. Undo

Western PA Luann (I am in w pa too!)

If the wax seal is bad

1) how would I know?
2) why would it sometimes have a smell but usually not?
3) what would you do as a first step to find out if it is the problem?

The reason I guessed it might be animals is 1) it does not smell like sewer to me 2) it will go away whether I do anything or not 3) it seems to come from the wall that is against the garage and might be open to the garage above the ceiling.

The toilet is cleaned and flushed once a week. Inbetween it is not (ie never) used.

There is an unused shower that everyone blamed but I pour water down it and it makes no difference. The sink is used off and on.

    Bookmark   October 13, 2008 at 11:02AM
Thank you for reporting this comment. Undo

The problem is most likely the little used bathroom. We had the problem in an office with a shower we never used. We just solved the problem by running water and a lot of it down the shower. It doesn't clear up immediately, and it does go and come. I am not sure what solutions we used but the fact that we started running it every other day made the difference.

    Bookmark   October 13, 2008 at 2:56PM
Thank you for reporting this comment. Undo

I 'll try Marge. That's what everyone tells me. Maybe I expect it to clear up too fast. I do my ironing there and hang clothes on the rod so I don't find it convenient to run it every day but I will try again. Actually I will try anything at this point. Looking for the Chlorox.

    Bookmark   October 13, 2008 at 3:52PM
Thank you for reporting this comment. Undo

Before you tear holes in your drywall (like we did), check any outlets in the area. After finding nothing in the opened up wall (thankfully a bedroom closet), a final 'nose' check pinpointed the problem at one wall outlet in the bedroom. Upon removing the outlet cover, we found a mouse had somehow squeezed in there and died wrapped around the innards of the outlet. Once removed, we cleaned and deodorized.

P.S. For whatever reason, the smell increased when my son used the shower in the adjacent bathroom. I researched and read about drain issues, sewer gasses, etc.

    Bookmark   October 14, 2008 at 10:40PM
Thank you for reporting this comment. Undo

sukis makes a good point. Nose-check everything, even the base of the toilet as you flush it.

DS purchased a home 2 years ago and the smell of dead mouse would come from one of the FR's walls about ever 4-6 months. He finally isolated it to an area where an outlet and the vacuum connection were located. We climbed under the house and saw signs from both mouse and chipmunk visits directly under the outlet area.

He removed both outlet covers and loosened the elec. box enough so that he could spray expanding foam in the wall. He hasn't had any odor problems in the wall since.

    Bookmark   October 19, 2008 at 3:33PM
Thank you for reporting this comment. Undo

The wax seal is under the toilet... you need to lift it to check the seal.

    Bookmark   October 20, 2008 at 3:39PM
Thank you for reporting this comment. Undo

I've had plenty of dead mice in walls, under floors, etc.

Usually, the smell is bad for a while, but it gradually goes away completely. A single small animal like a mouse or a bird decomposes very quickly. If it's a larger animal, or multiple small ones, decomposition would take longer and the odor would persist longer, obviously.

    Bookmark   October 29, 2008 at 11:56AM
Sign Up to comment
More Discussions
Bad Contractor
My wife and I are nearing the end of a bad experience...
Bleach on carpet
Okay, posted at one fo the other boards, but I am desperate!! Hello,...
damp brickwork
Please can you help with damp brickwork at the front...
Boarders in single families
Like to have input how different cities and towns handle...
What would you do if...
1. You hired a contractor to remodel your kitchen (custom...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™