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Richard, thanks for advice. I meant to say a silicone sealant and not mastic, but it has still gone mouldy, will most likey redo this with a better sealant. There is an extract fan, but I have wondered if it is powerful enough and intend to look into upgrade. I think you are right about useing...

One answer might be to use a backer board. You could use a 6mm board fixed to the existing timber floor as manu recoms, being inert it won't move so no cracks in tiles. It still adds to floor build-up, but not as much as ply.

Does anyone have any good advice how to avoid mould. My shower tiling is only a couple of years old and black mould has crept into some of the joints already (and yes it is cleaned each week by my good lady!). Seems to be mainly the mastic at low level that is affected, if I re-mastic, which is...

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