For those items you can t remove from above run the plumber s snake down the vent pipe.
Snake drain from roof vent.
Then try the following.
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The drain is still flowing but slowly and will back up whenever both showers are running at the same time.
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Turn the water on before you bring the hose onto the roof.
Climbing snakes are usually lured into attics by the smell of rats so making sure there is no reason for a snake to want to climb into your attic is essential.
I believe the word idiot was used.
Snakes climbing into attics is such a common problem that pest removal services regularly encounter it.
Look inside the vent opening and clear out any debris you find.
To my horror the snake broke off of the drum and fell down into the vent.
Remove the vent cover with the screwdriver and set it aside.
Remove any items you can reach.
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.