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External rendering additives

Discussion in 'Plastering and Rendering' started by Jkb, 23 Dec 2018.

  1. Jkb

    Jkb

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    hi,

    I am planning on rendering an extension wall but I first have to scrape off the old stuff, which should not be a problem as it’s quite dry and flakes off just by rubbing it with your hand. I plan on mixing my own plastering sand and cement. I have 2 questions:

    1. When I scrape down to the brickwork, is there anything I should be treating the brickwork with before I render, bonding, waterproofing solution etc....

    2. When I prepare my rendering mix, is there any other additives I should be adding before mixing?

    Thanks in advance
     
  2. Ker-plunk

    Ker-plunk

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    Use an sbr slurry to prime the wall.
    Waterproofer in scratchcoat and plasticiser in your finishing coat.
     
  3. Jkb

    Jkb

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    Hi

    Thanks........ for the hard of thinking (me) :whistle: what’s an sbr slurry and what quantities should I apply?

    Thanks in advance
     
  4. Jkb

    Jkb

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    It’s ok, I just googled it......duh, why didn’t I think of that.....cheers
     
  5. roughcaster

    roughcaster

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    Don't even think about it in freezing conditions. External rendering, roughcasting etc at this time of year is not really recomended, and also, cover your sand up.
     
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  6. Jkb

    Jkb

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    All good.... I plan to do the job spring next year.

    Cheers
     
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  7. roughcaster

    roughcaster

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    The best way Jkb.
     
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