I wish to expand the size of my bathroom in my condo and will require the approval of my condo association. Currently, all bathrooms in the building are stacked vertically - so if a leak occurs it will leak into another bathroom. If I take a portion of the adjoining closet then any future leak could occur into the dry closet below.
Besides installing a floor drain and correctly pitching the floor. Are there techniques that can be used to direct a future leak towards the existing bathroom area?
Are there secondary barriers that can installed in between the units to direct leaks?
What due diligence can I present to the Condo Association to show I am doing everything possible to minimize any impact of future leaks?