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Question:

Any quick fix to rotting plasterboard in the bathroom behind the tiles?

On further inspection it is more like cardboard than plasterboard. Horrible!

Answer:

unfortunately it would need total retile if the tiles are popping off the adhesive has failed and it may drop and injure or damage the bath.
May 11, 2017
re-tile, maybe? pull loose tiles off, see as to what extent the sheetrock or backer board is damaged. Then replace that part and install tile back over. No! silicone is not your answer.
May 11, 2017

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