The wall that the bath/shower will be against has been stripped to the brick of all previous plaster. A plasterer has fixed plasterboard to the brick using dot and dab.
In hindsight we have realised this was probably a mistake, since it will be the bath/shower area and will be exposed to water. We've read that plasterboard can rot, when water gets through the grout between tiles.
It has been suggested that we put 8mm wedi board over the top of the plasterboard.
Before we go ahead with it we hoped to get some independent advice on here about it, if possible. Does this sound like a good solution? Will the plasterboard be okay if it is lined with this wedi board? Will the plasterboard be able to take the weight of the wedi board, and the tiles too? The tiles are large porcelain planks.
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