Then try the following.
Snake vent pipe roof.
In most cases the vent pipe exits through the roof.
The culprit could be a wasp s or bird s nest or even the carcass of a small animal like a squirrel or rat that fell into the pipe and became trapped.
Snaking a vent stack from the roof would.
Sometimes it might be in your yard.
But your vent will plug up again real soon because a drain cleaner can t do a good job of removing all the gunk that s gathered at the t junction of your vent and your pipe from your drain toilet.
They regulate the air pressure in your system allowing waste to flow freely.
Use a flashlight to shine a bright light down the vent pipe to look for further blockage you can reach.
To do it yourself start by clearing debris from around the pipe.
Pipes on your roof.
Located on the roof these vent pipes allow gases to escape from your sewer system.
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Here s a closer look at this issue.
Feed the end of a garden hose down the vent pipe and have someone on the ground turn on the water.
For those items you can t remove from above run the plumber s snake down the vent pipe.
If possible shine a flashlight down the pipe to look for the blockage.
Sewer vent pipe location.
To continue feed the end of a garden hose down the vent and have someone on the ground turn on the water.
Look for a narrow plastic or metal pipe protruding from the roof roughly above the sink or toilet with the drainage problem.
You will need a ladder to access the roof.
Look for a black pipe that is about three inches in diameter made of cast iron or pvc.
You ll usually find a vent pipe on your roof.