Wall standpipe drain system

I want to install a wall box with a standpipe drain for my washing machine. I'm trying to figure out how to plumb the drain line. Here are my questions: - Should I use 2" drain lines? - Do I need a trap (I'm assuming yes)? - Do I need a vent (I'm 32 inches or less from the stack)? - If I do...

For the last two years the stand pipe my washer drains into leaks under the wall into my carport, can this pipe rush? If so how should it be replace? I have "rodded" the pipe from the top of the roof and it will drain for a while and then back to leaking. Any help on this is greatly needed.

Washer drain/standpipe leaks through wall/floor....how far should the drain hose be inserted into the standpipe?

Does anyone have any suggestions on how to connect two washing machines to a single standpipe drain without having to manually pull one drain hose out, and putting in the other each time? Both machines will not be running at the same time (this is for a two-family house) so I don't have to worry...

The wall standpipe for my 10 year old washer machine overflows as the washer discharges water during the cycle. This problem only happened very recently. I tried to run the snake down the pipe but it only went about 2 feet and couldn't go any further. I also noticed the pipe is very rusty as I...