wedi/cement board transition to plaster?

24 Dec 2014
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United Kingdom
Am doing a bathroom Reno; doing the preparation myself but will be getting someone in to do tiling and plastering.

I am planning to use cement backer (wedi or similar) around a wet shower area, with a glass screen. The wall there is plastered, flat and in reasonable condition, so 6mm board attached with tile adhesive as-per manufacturers specification.

We want the tiling to stop just past the screen, and instead just be a plastered wall.

Is it better to use 6mm board all across the wall, and just plaster on top of the wedi? If so, should the wall tiles be put on first (with an edging strip), or else how to delineate where he'll need to plaster up to?

Alternatively I could use 12.5mm wedi and join it to plasterboard over the existing wall attached with grip fill. I'm not sure that saves terribly much money as the thicker backer boards are more £ even though plasterboard is cheap.

What's the best route ?
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