He used a plumbers snake and he could put it down through the vent until it reached water.
Snake through roof vent.
He has also been up on the roof checking to see if there was a bird nest or something blocking the vent.
Insert the head into the vent opening and feed it down until you encounter resistance.
Let s see if we got it open or not.
He didn t find any obstruction.
If you can see but can t reach run a plumber s snake down the vent pipe.
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Crank the handle to work the head through the obstruction.
Snaking a vent stack from the roof would entail carrying a heavy auger up there and running an extension cord to power it but milwaukee tool recently launched a revolutionary idea in augers.
Bring a 20 foot sewer auger onto the roof.
Start by trying to clean the roof vent and main drain with a hand held drum auger.
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Use a flashlight to shine a bright light down the vent pipe to look for further blockage you can reach.
And on homes that do not have a main drain cleanout accessing a clogged main drain through the roof vent could be your best option.