Every 3 years we get this awful smell, like Parmesan cheese that seems to come through the walls on our stairwell. It is very strong and lasts for a week or two, then completely vanishes! We live in a pole home, so the underside of the house is exposed. I am wondering if there is some plant, or mould that could be causing this strange odour?
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There may have been an animal that had died in your stairwell and the decay process definitely smells. That this has happened more than once may mean an animal has easy access to that area. You should have the stairwell area checked to see if there are any areas that an animal can crawl into. Next time the smell starts again, have a pest exterminator check the stairwell area to check and remove the dead animal. It is important to have the animal removed quickly as the decay process liquids leak into the wood framework and can damage and/or smell for a very long time.
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