I am adding two bathrooms upstairs in my attic. Anyone know best approach to add waste stack 3" to a 2nd floor where no waste line currently exists? All bathrooms plumbing is downstairs in three baths. Slab on Grade foundation. Two hot water heaters are upstairs in attic. No problem getting water. Regarding wasted line I have thought about going through one of the existing bathrooms by dropping the 3" line down the wall and tying into existing toilet waste line. I will have to cut up the concrete floor, patch together the pipes, etc. Sounds very messy. Also,I have thought about dropping a 3" line inside an exterior wall closest to where the main drain exists the house on it's way to the street. This will require cutting the side of the foundation to get pipe to the ground and patch into the main drain. Not sure about cutting the footing on a slab. I have seen where this technique is used and pipe penetrates exterior wall just above the slab and goes down into the ground. Not very pretty. My main drains exits at the front of the house. Any other thoughts would be welcome.
Thanks. Dave Seebeck