This is my initial proposed DWV arrangement for my retirement house that I built.
The house is in a remote area that is not governed by plumbing codes, however, I want to make sure that I'm not about to make any major mistakes that would prevent the draining and venting from working properly.
The sketch shows a 4" main line, however, after reading many pros and cons of a 3" line vs a 4" line, I'm still not sure which size to go with.
The sketch is pretty much to scale. It's on a post and pier foundation with an open 3 foot
crawl space, hence the trap on the tub being above the floor to prevent freezing.
All the piping to be PVC; I was thinking of schedule 20 for the vents, 40 for the drains.
And, of course, all the elbows, tees, etc. will be standard plumbing fixtures, not with the sharp angles as shown in the sketch.
( I would have shown a 3" stack vent, however, the 6" wall happened to fall right under a truss at the top and right over a joist at the bottom, leaving slightly less room than needed for a 3" pipe. )
Appreciate any suggestions that point out any errors in this arrangement that would give me problems.