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mr_bus

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Hi. My daughter is having a walk in shower fitted by builders. I am concerned because most of the forums I have visited seem to advise the use of cement board in the wet area although I admit there does seem to be some disagreement about this. The builders have used concrete board on one of the walls (third pic down), but mostly to firm up the wall prior to tiling as it has a pocket door and was a bit flexy prior to the concrete board. However, on the other walls they have used GTEC moisture board. GTEC website does not give much advice on this board but Knauf site specifically states on their moisture board information that 'if tiling in a wet area, use Knauf AQUAPANEL' Moisture Panel | Moisture Resistant Plasterboard - https://www.knauf.co.uk/store/moisture-panel/c-23/p-58. I have mentioned this to the builders but they assure me 'they've done this loads of times'.

I have done plenty of bathrooms and kitchen and to be honest always err on the side of caution with any decision on materials even if it does cost a little extra. I would be grateful if someone could take a quick look at the pitures provided and hopefully reassure me that all is ok, or, if I need to have a frank discussion with the builders.

Forgot to say - they are not planning on tanking, just tiles straight on top of board.

Thanks in advance.

pipework.jpg

doorway and window.jpg

shower corner 2.jpg

shower corner 1.jpg
 
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Notts_Rob_66

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They should be using a backer-board - a lightweight multiboard with foam core works well - with joints sealed, or tanking the board that’s been put in place (not needed if right board used in the first place. See BS 5385, standards for tiling, which recommends waterproof board In bathrooms.
 

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