Our current kitchen remodel plan calls for sliding the kitchen sink 8' to the right, on the same wall where the current sink is located. The vent for the current sink location runs vertical directly behind the sink before turning horizontal and then vertical again after clearing the window over the sink. I have a drop ceiling in the basement below and current drain lines run below the floor joists in the basement.
What I would like to do is tie new sink into the existing drain and be done but I understand that the horizontal length of the trap arm would exceed the maximum length provided in the UPC. I see a couple ways to address this, but not sure which is best and if they all comply with the UPC.
What I would like to do is tie new sink into the existing drain and be done but I understand that the horizontal length of the trap arm would exceed the maximum length provided in the UPC. I see a couple ways to address this, but not sure which is best and if they all comply with the UPC.
- It seems that running running vertical in the wall behind the new sink and then cutting over to tie into the vent at the current sink location is the obvious way to do this but would like to avoid boring through the 2x4 load bearing wall for an 8' stretch (#1 in drawing).
- Another option would be to extend the trap arm as far as I can under the floor and then cut vertical so that I'm only boring through a couple load bearing 2x4s. (#2 in drawing).
- Curious if running underneath the floor for a span and then turning vertical within the maximum trap length specified and then running horizontal under the floor for a couple feet before turning vertical to tie into the current sink vent location (#3 in drawing). Essentially, this would do all the "work" under the floor so that I would pop through the floor and into the vent without disturbing the load bearing wall. I might need to drill through the middle of one or two floor joist to do this. I'm guessing this won't work because of the horizontal vent below the sink. If this doesn't work as described above, would adding a loop like you would for an island and then running that to the current sink vent location under the floor be an option?