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Wow, thanks a ton for all the great info. Sure clears up alot of questions, though I still have one more. Around here there are alot of 4" drain lines. My own homes main drain is a 4 incher. Then the 4" main vent pipe stubs up outta the basement floor for about 1 foot. Then the piping is transitioned to a 3" pipe that continues all the way through the roof line. My home does not exceed the allowed 48 DFU's for a 3" pipe. So, my question is, is it ok that a 4" drain was installed. I'm guessing as long as the proper sloping for a 4" drain line is followed that it's within code to install this larger diameter pipe and possibly prefferred over a 3" drain pipe.
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