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Discuss BAL Prime APD on Cement Board - Dilute or Not? in the Tanking and Wetrooms Forum area at TilersForums.co.uk.

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  1. schismatic

    schismatic Active Member

    Location:
    Gloucester, UK
    I’m about to tank Hardie Backer cement boards using the BAL WP1 waterproofing kit. I’m a bit confused with the Prime APD. Should I just paint this straight on, undiluted, or should I be diluting at all? If I do need to dilute, what proportions?

    Cheers.
     
  2. Andystiletiling

    Andystiletiling Trusted Advisor Professional Tiler

    Location:
    Burnley
    One undiluted coat will be fine before tanking..
     
    • Like Like x 2
  3. Waluigi

    Waluigi Top Contributor

    Location:
    UK
    Screeded floors need diluting 1:1 but I remember Bal being a bit funny with their installation instructions regarding WP1. At the stage at which I stopped using their system, they wanted you to skim the Tile backer board with tile adhesive and priming/tanking once dry.

    This was ten + years ago so might be worth contacting their tech team. They’re usually very good.
     
  4. schismatic

    schismatic Active Member

    Location:
    Gloucester, UK
    Probably best if I ring them to get a proper answer, but I suspect that dilution will be required as the boards are cement-based.
     
  5. impish

    impish Trusted Advisor Professional Tiler Top Contributor

    Location:
    Preston, Lancs
    Diluted 1:1 but as hardibacker is SO absorbant, I'd suggest 2 coats.
     
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