I had similar issue with the house we now live in that we bought about 3 years ago. I got a call from the tile guys who were installing 2000 sq ft of travertine. At that time we had just had the kitchen ripped out waiting for tile work to be completed before installing new kitchen. They said they smelled gas. My wife said it smelled like sewer gas. It was intermittent and I was panicked thinking explosion.
I had 2 plumbers come out and they couldn't find anything of significance. One found a clean out behind the drywall with a loose cap. He extended the pipe through the drywall and installed a new cap. I was hoping that was it but the next day the tile guys complained again.
The only gas going into the house was propane for gas fireplace. I turned off the propane at the outside tank and that didn't resolve the smell.
It drove me crazy.
In the interim, I had electrician come out to run wire for new stove. After he cut open the drywall he said "oh I smell insecticide behind the drywall." It seems the the house had tubes running in the walls so that insecticide could be pumped from outside into interior walls. The smell was residual insecticide trapped in the walls after 18 years of being treated. When kitchen was gutted there were some drywall removed that exposed interior wall to open air.
Also when the tile guys were cutting door jambs they were cutting into insecticide soaked wood causing the smell to get worse.
I had 2 plumbers come out and they couldn't find anything of significance. One found a clean out behind the drywall with a loose cap. He extended the pipe through the drywall and installed a new cap. I was hoping that was it but the next day the tile guys complained again.
The only gas going into the house was propane for gas fireplace. I turned off the propane at the outside tank and that didn't resolve the smell.
It drove me crazy.
In the interim, I had electrician come out to run wire for new stove. After he cut open the drywall he said "oh I smell insecticide behind the drywall." It seems the the house had tubes running in the walls so that insecticide could be pumped from outside into interior walls. The smell was residual insecticide trapped in the walls after 18 years of being treated. When kitchen was gutted there were some drywall removed that exposed interior wall to open air.
Also when the tile guys were cutting door jambs they were cutting into insecticide soaked wood causing the smell to get worse.
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