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Really bad smell coming up from the crawl space through the floor

Really bad smell coming up from the crawl space through the floor

Old 12-07-22, 05:39 AM
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Really bad smell coming up from the crawl space through the floor

I just had my house completely remodeled to the gut. The living room smells really bad either like dead animal or sewer smell. Most of the smell come from this one from from the floor in the living room. Below it is the new main sewer pipe in the crawl space to go out to the street

Called the GC he sent a plumber. He said no issue with plumbing and no leak down in the crawl space. He also found 3 dead rats in the crawl space (we fumigated the house before moving back in) so we all thought the smell came from them.

I had a rodent company came to completely clean the crawl space, removed all insulation infested with rat poo and pee and re insulated the whole crawl space. They found another dead rat and sanitized the whole crawl space then put a vapor moisture barrier all around.

The deodorized and sanitized worked made the smell significantly better but there was still a bit of smell. I ran an air purifier and open the window to let the bad air out for 2,3 days.

The smell starts to come back again after in the same spot. Depends on time of the day it can be slightly noticeable to super bad smell standing above the spot.

What can be the source of the smell? How can we confirm and fix it?
Old 12-07-22, 01:14 PM
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Maybe one of the neighbors is poisoning the rats and they are coming to your house to die. I would have the crawlspace checked again and have them seal any holes the rats could use to get in there.
Old 12-12-22, 03:14 PM
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I had an intermittent sewer odor in my House a couple of years ago. Very hard to locate it, but found an open sewer vent line that was buried within a wall. It was simply part of the vent line that the contractor never connected up elsewhere within the wall. No actual waste water ever leaked out, just the smell. It only occurred when conditions were right to force sewer smells thru that section of the vent. If there is a room above you and the vent line runs near there, that might be it too. Inquire with the Contractor where he ran the vent line / stack and if there are any connections that might have been done in that area.

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