Waterproofing a sloping ceiling in a shower

[806cat]

We are having a small ensuite fitted in an attic room and as a result, the shower has a ceiling sloping from approx 2m to 1.5m, which means that the bottom of it is likely to get wet. It is tiled on 3 walls but the suggestion is to just paint the sloping ceiling with bathroom paint and blade it after use. My gut feeling is that this won't be enough as, as far as I know, bathroom paint isn't really designed to get wet, just damp. I have thought about the following options:

1) Tile the sloping ceiling. This seems the sensible option to me but there may be reasons it's not such a good idea?
2) Use an acrylic sheet as a splashback on the sloping ceiling
3) Use an epoxy paint or some other specialist paint which would be more waterproof. There are the damp seal paints which are supposed to keep damp out - would these work the other way if you like, i.e. keep water from the shower from soaking the underlying wall?

Any help much appreciated.

Robert

 

[vinn]

With your shower "wall" coming below a roof rafter soffit, presumably on an external wall, then there will always be the risk of condensation forming above in the soffit roof space.
Is there eaves ventilation, and insulation above?

Tile is the usual way of dealing with soffits.
Backer board over a vapour barrier.

 

[806cat]

I don't have any concerns regarding the shower vertical walls as none of them are on an outside wall and are all tiles on hardiebacker board. It is just the sloping ceiling (which I remeasured and goes from about 2m down to 1.75m) I have concerns about. It is basically emulsion on plaster/plasterboard at the moment and the shower head is likely to wet the bottom part of the sloping ceiling. There is a powerful extractor fan in the shower which should limit the amount of moisture in the air but it is more direct water contact on the bottom part of the ceiling which bothers me and therefore I think it needs to be properly waterproofed and that using bathroom paint alone may not be sufficient.

 

[vinn]

Yes, I've just advised you yesterday about what to do with your soffit?

 

[806cat]

I didn't quite understand your reply. As mentioned, none of the shower walls are on an external wall. It is just the sloping ceiling I am concerned about, which is part of a roof, which is insulated with rockwool (I think) and nowhere near any soffits, unless I am misunderstanding what you mean by soffit here (I am just a humble DIYer).

 

[Pigeon85]

Tiling would be the best option in my opinion, if you was to just paint then I would seriously consider using masonry paint.