"Upscale" wrote in message
...
I have pretty much zero plumbing experience but I have to ask. Why not use
larger pipe exiting the basement wall, SNIP

I've been lead to believe that the trend is actually to smaller diameter
waste pipe which better accommodates the new 1.6 (and less) gallon toilets
that have been mandated. The theory, I think, is that you get a better
"push" with the with the smaller volume of water in a smaller diameter (say
three-inch) waste pipe.
--
NuWave Dave in Houston