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Waterproof bonding?

Discussion in 'Plastering and Rendering' started by JohanJones, 11 Feb 2015.

  1. JohanJones

    JohanJones

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    Hi all,

    Have stripped back an bathroom wall (over bath) that is single skin extension, internal front bay and internal walls of an outside toilet area, all plaster off.

    Old plaster on all been there many years but all had some signs of old/previous water ingress.

    Question is to play safe when bonding such walls, is there a liquid or something that will work with bonding acting as a waterproofer without affecting the plaster?

    Or other than the pva wash is there something else or some other way to approach this?

    Bathroom will eventually be tiled, so think a multi-finish plaster coat is needed, is that right to tile on multi-finish skim rather than straight on to the bonding?

    The other walls will be multi-finish plastered as will be painted.

    Many thanks,

    Johan
     
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  3. Alastairreid

    Alastairreid

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    If you want to play it safe you should cement render the external walls with waterproofer through the mix.
     
  4. JohanJones

    JohanJones

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    Hmm...you mean the inside of the external walls?
     
  5. Alastairreid

    Alastairreid

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    Yes.

    It would be better to tile onto as well...Bonding plaster on its own is unsuitable to tile.
     
  6. JohanJones

    JohanJones

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    I suppose I could do the lot, cement render inside with the added waterproofer, then bondng and then a multi-finish coat...that will work wouldn't it?

    Thanks in advance for all of your advice.
     
  7. Alastairreid

    Alastairreid

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    I wouldnt bother with the bonding if it has to be tiled.
     
  8. JohanJones

    JohanJones

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    So don't bother with either the bonding and multi finish and go straight on to the cement render....I suppose that makes sense and is easier too!
     
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