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Rendering small wall, mix by hand?

Discussion in 'Plastering and Rendering' started by robodelfy, 9 May 2020.

  1. robodelfy

    robodelfy

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    Hi, sorry for any silly questions, first time rendering here!

    I'm getting a guy to come and plaster this wall, but he said I could save some money by doing a coat of render then a scratch coat, then he'd plaster.

    It's such a small job, how hard would it be to mix the render without power tools. Would you just use a spade in a bucket? Any idea how many bags or cement and sand I'd need for a wall like this?

    Also, what mix would you go for, on the first and second coat. I have some SBR and waterproof admix, not sure if I should use both in the mix or just one, I bought them on the builders advice. It's an external wall on an old Victorian house, I want it to be protected from the elements

    Thanks
    20200509_163902.jpg
     
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  3. you need to brick it up first.
    4 bags of building sand and a bag of cement will be plenty.
    id go for 4 1/2:1 with sbr .
    mixing on the floor or on a spot board with a shovel.
    mix your stuff up then generously wet the wall with a sprayer or hose set on a fine mist before starting.
     
  4. robodelfy

    robodelfy

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    Thanks, yeah I'll brick under the window first, just need to cut some bricks to fit the gap.
    So 4 parts sand, 1/2 part cement and 1 part SBR? That seems like a lot of sand and SBR but not much cement! Do I use this same mix foe the first coat and the scratch coat. I read about making a slurry for the first coat, kind of painting it on everything

    What do you mean by mixing on the floor? Would a bucket not make more sense than a board
     
  5. datarebal

    datarebal

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    Floor

    looks like he means 4.5 sand to 1 cement...with added sbr
     
  6. no ...4.5 :1 with sbr.
    you can mix in a bucket if you like.
    i’d only be painting slurry on first if there was a major damp problem.
     
  7. robodelfy

    robodelfy

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    Ok thanks, so 4.5 sand, 1 cement and added SBR. So would you use SBR only, not waterproofer admix? Because I bought that to put in the mix

    Thanks for the help. Theres not a damp problem that I know of, but there's some dodgy brickwork, its. double brick wall and victorian houses are prone to damp issues. So if a slurry would help protect from damp in the future, maybe I should do it.
     
  8. HERTS P&D

    HERTS P&D

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    Let the plasterer do it, plastering/rendering is an art.

    Andy
     
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  9. sbr or waterproofer. either or. but
    sbr will make the mix more flexible, give more adhesion to the brickwork and it’ll be easier to get a nice mix by hand.
    you could mix a strong sbr slurry if you like, and apply it by brush and stipple it as a key for your cement coat.
     
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  11. lostinthelight

    lostinthelight

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    Not only that, the plasterer wont be able to blame OP’s rendering if the skim coat cracks all to hell
     
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  12. robodelfy

    robodelfy

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    I've done some small plastering jobs myself, tiny walls. This is quite a small space, I don't see why I can't do a scratch coat. You have to start somewhere!
     
  13. maybe the forum should be renamed ‘let the expert do it’ .
    no harm in having a go. your obviously keen to hone your skills. knock yourself out!
    if it goes wrong scrape it all off ......... then let a spread do it:)
     
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  14. HERTS P&D

    HERTS P&D

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    Benny, I'm on your side. I'm trying to stop all the diyers nicking your work. ;)

    Andy
     
  15. robodelfy

    robodelfy

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    Thanks, yeah its about the only opportunity I'll get and you can see how small the wall is.

    One more thing, should I put anything on the bricks before laying the first coat of render? Should I just wet it, or use SBR?

    And do you get a special rake type tool for scratching up each coat, or is good DIY solution?
     
  16. there’s more money in it after they realise they can’t do it:LOL:... i’d have bricked it up and bought 2 bags of hardwall. robodelfy wants to learn rendering(y)
     
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  17. get yourself a length of 2x1 which you can use to rule it off - square it up.
    also you could use a polyeurethane float with a couple of nails in to lightly scratch it up and flatten it off nice.
    give it a good wet with plain water.
     
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