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Screeding a shower base

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  1. #1
    Apprentice (new member)
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    Default Screeding a shower base

    Hi all!

    Hopefully someone can help out. i gutted the bathroom which is constucted onto a slab. my intention is to build a tiled shower base in its place with a hob, correct fall to waste and tiles. i had assumed the original bath was on top of the slab but we ripped it out and its was built into the dirt, and bricked in. good for moving pipes around, not so good for building a new shower on. my question is... can i make a dry unbonded screed mix directly onto the ground and this will be sufficient or do i need to concrete first, wait for it to cure (a long time) and then screed the base, waterproof and tile.

    any advice you have is greatly appriciated, time is important as this is not a second bathroom, its our ONLY bathroom so we have no shower right now.

  2. #2
    Qual Tiler
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    Aug 2010
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    Atherton FNQ
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    Default

    concrete first , a screed by itsself would be too weak.

    too keep things quick,
    use rapid set, for the concrete base
    install hob(neutral silicon down premade concete hob blocks)
    screed using Ardex A45 (dries in 90 mins)
    waterproof a few coats
    then tile

    all up less than a week if u need a bathroom quick.

  3. #3
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    Default

    Thanks for that. very much appreciated.

    1 other thing, to build the curb for the shower is hebel the best thing to use? its seems pretty popular but not many places seem to stock it. could i use a single row of bricks?

    cheers,

  4. #4
    Flaccid Member - 1k Club Member
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    Default

    i just formed mine up with timber and made a concret hob...

  5. #5
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    Buy Hob blocks from a landscaping / earthworks place.
    or any place that sells pavers should have em.
    If u form up and make ur own hob outta cement make sure u use the quickset.

    Hebel hobs are weak and prone to damage thru movement, something u dont want when waterproofing is involved.

  6. #6
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    Quote Originally Posted by stevoh741 View Post
    i just formed mine up with timber and made a concret hob...
    ok, so you're saying if i just stack say 2 rows of 2X4, concrete neatly and then waterproof it will work fine.

  7. #7
    Flaccid Member - 1k Club Member
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    Yep, mine has been fine for the last 6 years. I think I used fence palings on edge (for memory) to form it up, spacing them roughly 80-100mm apart. no reo req'd. Think I gave it a good week to cure, then waterproofed and tiled

  8. #8
    Qual Tiler
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    Default

    standard hob size is 90x90 k

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