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Preslope shower recess before waterproofing and screed?

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  1. #1
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    Default Preslope shower recess before waterproofing and screed?

    Does anyone here put a preslope in to the shower recess/hob prior to the water proofing going on?

    You still put your normal screed on top of the water proofing but the idea of the preslope is that if water did penetrate the tiles it would run to the drain and out the puddle flange. In the past I have not done this but have recently been told I should have, it now makes sence, if you didn't do it and water does penetrate it's just going to sit there on top of the waterproofing and not drain to the puddle flange/drain.

    Is this common practice in Australia?

  2. #2
    Heavy Machinery Claw Hama's Avatar
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    Don't know if its common place but the guys I have worked with do it or at least slope it away from any doorways etc
    A good edge takes a little sweat!!

  3. #3
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    In my experience the tiler usually lays a bed of sand and cement down over the Waterproofing and slopes/screeds to the waste pipes then tiles over!!

  4. #4
    PLU.MBR.BL.DR. bricks's Avatar
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    You can also get waterproofing that will let you tile over so you waterproof over the screed.
    If you dont play it, it's not an instrument!

  5. #5
    Novice Riley's Avatar
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    Quote Originally Posted by AIRMAN View Post
    Does anyone here put a preslope in to the shower recess/hob prior to the water proofing going on?


    Is this common practice in Australia?

    No
    A good guess is better than a bad measurement.

  6. #6
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    Im sure the req is the waterproofing straight to floor before the screed, at home I did that, then got the tiler to lay half his bed in the shower and and waterproofed again. so im double water proofed. seen too many leaks in my time not to.

  7. #7
    Golden Member mic-d's Avatar
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    It's not common practice in Australia, but it is in North America (ontariotile.com). It means that any water that might get though the tile and screed will drain off the waterproofing into the drain weep holes, keeping standing moisture to a minimum and minimising mould development. It really has no practical impact on the waterproofing.

    Cheers
    Michael

  8. #8
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    I am about to do my bathroom also and was advised by the tile shop to screed first, fit the flange into the top of the screed (dig out a bit of screed so it is level), duct tape over the hole, and then water proof everything in one go. (2 coats plus the fabric membrane).
    Good luck.

  9. #9
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    Default Screed or waterproof first?

    When I was doing my bathroom recently, Ardex Australia technical support recommended to screed first then waterproof over the screed. They said it does not matter which comes first. In commercial applications they recommend membrane then screed as tradies walking all over the membrane will punch holes in it before the tiling is done. But in a residential situation where this should be easily avoided then screed first then the membrane is the preferred option.

    Cheers
    Juan


    "If the enemy is in range, so are you."

  10. #10
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    I'm no waterproofing expert but I would have though (And it's what i did with my tiled shower bases) is to screed your falls in first, waterproof over this inculding your puddle flange then tile. this allows any water that has penetrated through the tiles/grout to then escape (using the fall) to your puddle flange.

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