Does the bathroom have to be a sliding door? The living room is floored

It depends on the specific situation.

Yes, if in the shower, to be added.

Prevent water from flowing out and make a dam to retain.

Then it's okay for reference.

You can't have it, now there is a sliding door without a track, yes, as for the water retention, pro, the track is glued to the floor, even if there is water, it can't be stopped, and other colors will be laid at the door to distinguish the space when the floor is paved, and it will be slightly higher when it is paved.

Not necessarily, there are two cases. One is to go down the track, then you have to do it too much or groove the ground to make the track. One is on orbit, then the ground treatment doesn't matter.

Nothing is needed anymore. But remember that the track must be too hard, and if there is a problem on the track, it is not a joke! Hope it helps!

It's not a sill, what the sliding door needs is a track, depending on the height of your sill, you can install it to the same height as the ground.

You can choose the kind of lower rail used on the wardrobe, and you can put it directly on it, so you don't need to add a threshold.

It depends on whether your bathroom will overflow the living room.