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I'm in the process of planning the 2nd floor DWV lines for my house. Or more accurately redoing them with the reality of very limited space between floor joists that are 2x10s 12" OC. The attached drawing represents my current plan (1st floor plumbing is omitted). The first floor sits on a 4...

Currently I have a 1" meter at 55psi that connects to 1 1/4" pipe running to the house, about a 40 foot run. At the house entrance it reduces back to 1" for 2 feet before going back to 1 1/4" inside the house. The total developed length is then about 150 feet. Looking at the WSFU charts, if I...