Once you understand where the stink comes from you can get rid of it.
Floor drain in upstairs bathroom.
The center of the lav s drain is located 18 approximately above the finished floor.
On a second floor try to position it so it backs onto a bathroom.
The drains go beneath it to the basement but notice the aav under the lavatory sink.
Next pour bleach down the drain close the bathroom door and allow to sit for two hours.
How to fix a leak from the upstairs bathroom.
If something is leaking in your upstairs bathroom you will probably know by the stains on the ceiling below it.
The noise will keep you awake.
After thoroughly cleaning the bathroom approach different corners and drains above the bathtub or floor and try to determine where the smell is strongest.
The picture shows this bathroom.
Rinse the drain with a gallon of hot water wait 15 minutes then rinse with cold water for ten minutes.
Rinse away the bleach with a gallon of hot water dumped slowly down the drain.
A damp spot or worse a continuous drip from the ceiling overhead signals trouble.
Don t put the laundry too close to sleeping areas.
Run cold water for ten minutes to finish rinsing the drain.
For convenience on the main floor anywhere off the kitchen makes sense as does a mudroom or off the garage.
This will hold the lines in place until you are ready to add furniture and individual fixtures.
This means that it joins a drain for a first floor half bathroom under stairs.
Also notice the drain is centered right in the middle of this 30 inch vanity.
Do consider where you can tie in to existing plumbing.
If you have a second story bathroom the problem could be in.
Close to kitchens and washrooms.
Have a helper guide the tops of the pipes into the opening in the upstairs bathroom wall.
The plumber who did the final plumbing for the half bath a couple of years ago put it there instead of a true vent probably because it s in.
Another possibility is continuous dripping of water.
Measure 21 inches approximately above the finished floor.
The bathroom sink s water lines are roughed in 3 inches above the drain.