How to waterproof above shower tiles?

[TheDoorIsBroken]

We recently replaced our showerhead with a deluge style, and noticed water splashing or being sucked (exhaust fan) above the level of tiles: onto plaster (brick wall). I'd rather avoid any moisture issues in the wall.

I feel like a solution could be to install another row of tiles above the existing ones, although only have 3 spare tiles so not ideal. Also not sure process of waterproofing over plaster - can I get a good enough seal?

Another option maybe to hacksaw off the vertical section of showerhead I expect there could still be some splashing up though

Maybe it's also not a huge issue at all

Any advice?

[JacobZ]

Hi @TheDoorIsBroken,

Are you sure that the issue is from water splashing up there?

Looking at the location of the showerhead and the surrounding surfaces, I can't see how it could splash up there.

Are you sure it's not from the steam condensing on the walls? 

This is a common issue in bathrooms, especially in winter.

There wouldn't be much benefit in adding a waterproofing membrane at this point. It needs to be on the bare plaster underneath the paint and tiles, and applied in one layer with no gaps.

I don't think it is too big an issue. I would just seal the top edge of the tiles with White Wet Area Waterproof Silicone Sealant. Any water splashing on the wall or condensing on it will run down the wall where it will run over this silicone bead and down the tiles into the shower.

Check out How To Silicone a Gap for some guidance.

Let me know what you think and if you have further questions, please don't hesitate to ask.

Jacob