there isn't a good way to know unless you camera it, but if your snake is head is full of dirt (not rust) its a good sign.
Put Copper Sulfate in the drain. It will kill the roots and they will eventually break off and go down the drain. This isn't an immediate fix.
If it is not in the trap, then it usually can only be located by "snaking" the pipe with a plumber's snake, a length of braided steel cable with a pincer or spiral spring end. The snake can be pushed through the pipe easily until it meets the obstruction, where it stops. Rotating the snake then bores through the obstruction, or, alternately, latches on to it so it can be pulled out.
Radio Shack "drain pipe tracer".
A roan pipe is the drain pipe leading down from the gutter, also known as a gutter pipe. As far as I know it is of Scottish origin.
Water won't drain from shower. Either trap or shower drain line is clogged.
Mission CAP or IPS plug if there is a female fitting
Yes, a sewage drain pipe can be too large.
Foul Air
No, stand pipe for washing machine is meant only for washing machine. Tie sink into drain line that washing machine stand pipe is tied into. 2" minimum drain line should be what you tie into. Sink drain line use 1 1/2".
If you are talking about a roof water drain pipe to sewer it is illegal. If you are talking about a sink drain pipe well that is where they all connect to so yea.
dvw pipe = drain, waste and vent pipe.
About 10 minutes if they know what they are doing