I'm researching and spec'ing out the house I hope to build in a few years.
Now, I haven't checked with the city or even a plumber yet - I just wanted to float this idea by some experienced amateurs and possibly professionals on the forum here before investigating further.
Any thoughts on going with a 6in sewer lateral over 4in? That 6in diameter will probably extend a few feet above the basement floor on at least one drain stack. I know parts will be more expensive, and a backflow preventer has been harder to find, etc.
My primary reason for considering 6in is nothing more than "if 4in is good, 6in must be better!"