In a big home improvement projet we are planning to move the bathroom.
The plumber want to run a new waste line to the basement which imply opening a wall, removing laminate flooring, breaking concrete and digging in the home theater room! This new line would be, horizontally, 7 feet long with a 90 degrees bend and then 3 feet long before going down vertically to the old waste line in the basement.
Of course I would like to avoid all this work and would rather use the existing waste line. I believe we could align the toilet to fit between the floor joist and run a straight 14 feet long waste line to the old waste line. I have a dropped ceiling in the basement and there is a minimum of 8" of clearance and almost 12" near the old waste line. IMHO running this new line would be much more easy and there should be enough clearance for a slope of 1/4" per feet.
Here is some ASCII art (side view) :
Actually Plumber new waste line My suggestion
T T T
1st floor ======================| =======|==============| =======|==============|
| ,------' | `--------------+
| | (+3' on other axis) | |
| | | |
Basement ======================| |=====================| ======================|
<----------------------' <-+---------------------' <----------------------'
Plumber said this is "patchwork" and he refused the idea. Do you believe he is right about that?
Note :
- Venting shouldn't be a problem : there is only one floor so running the vent in the attic and inside the new bathroom walls should be easy I guess.
- The old waste line will still be used by the kitchen sink but there won't by any additional fixtures.