I know it seems weird but, no never in an upstairs bathroom. I know plenty of people will do it but I like to be able to guarantee my work and I've seen too many fail. Some fail fast but 2-3 years is not uncommon and even 5-10 years would be a bother for me. If you ever get a chance to look at the deflection of some of the victorian floors from below (i.e. when the ceiling is removed in the room below) then you might reach the conclusion I have! Despite the fact that the ceiling will add some rigidity it's still a lot of flex.
Mostly people are following style cues from other countries who have different building methods and climates as well as different age of buildings.
I know it seems weird but, no never in an upstairs bathroom. I know plenty of people will do it but I like to be able to guarantee my work and I've seen too many fail. Some fail fast but 2-3 years is not uncommon and even 5-10 years would be a bother for me. If you ever get a chance to look at the deflection of some of the victorian floors from below (i.e. when the ceiling is removed in the room below) then you might reach the conclusion I have! Despite the fact that the ceiling will add some rigidity it's still a lot of flex.
Mostly people are following style cues from other countries who have different building methods and climates as well as different age of buildings.