We are in the process of remodeling a house and have completely gutted it. We are needing to replumb 2 new bathrooms and the kitchen for a pier and sill foundation. What size pipe do we use for the main sewer line and where can I find diagrams for tying it all together? The bathrooms are on opposing sides of the hallway at the forn of the home and the kitchen and the utility area are at the back where the line into the septic meets the house. Your help would be appreciated.