They unclog Toilets and other plumbing in the house
A auto vent
You should use a plumbing snake to clear a clog.
I would not trust them to unglog anything
Yes BUT not an outside wall
yes,
Vent through roof
You should not have to clean a vent on the roof. unless you are trying to clean the waste line to the fixture below. Then you would send plumbing rods through the vent on the roof.
In plumbing the roof vent should be a min of 4" to prevent hoarfrost
Roto-Rooter is an American owned plumbing business. The name plays on the fact that they can unclog your pipes with a "roto-rooter", or plumbing snake.
Yes, it does
Yes a vent pipe can be painted AFTER it has passed inspections and some localities want the piping labeled "Vent"