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render a concrete ceiling

Discussion in 'Plastering and Rendering' started by dmacca3, 13 Jun 2010.

  1. dmacca3

    dmacca3

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    i have a concrete ceiling in my outhouse i wanted to know if it is possible to render it as it is in a poor state so that i can plaster it later. thanks
     
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  3. JMLanders

    JMLanders

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    Would it not be easier to build a suspended ceiling?
     
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  4. dmacca3

    dmacca3

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    i forgot to mention that it is letting water in, would bitumen work
     
  5. 1john

    1john

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    where is the water entering from, you need to stop it getting in, not keep it up there see. Trapped water will cause more damage and it always finds a way out too.
     
  6. dmacca3

    dmacca3

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    it has spread from next doors outhouse both are joined they have had a leak and it has started to come through to mine
     
  7. Micilin

    Micilin

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    As said , try to divert the water first . This is by far the best solution, and really the way to go if possible.

    When you say poor state, will it take a render?


    If not possible, you can render the ceiling and walls to keep the water out -'Tanking' with waterproof sand and cement. If the ceiling is very wet, it takes a bit of practice, tanking it while hoses keep the water diverted, then removing the hoses and plugging the hole with a rapid set waterproof additive - you can then give it the next tanking coats but better to rub up and not skim .

    If it is not too wet ie you can coat it - scud (spritz etc ) , coat, scud, coat will do it, with all internals coved.

    You could blackjack , blind it with sharp sand and then render
     
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  8. dmacca3

    dmacca3

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    what do you mean when you say blind it with sharp sand
     
  9. roughcaster

    roughcaster

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    Brush on the Blackjack Bitumin paint, then blind/throw sharp sand onto it while the bitumin is still wet. The sharp sand will then stick to it. When the bitumin/sand has dried, that will give you a "key/rough surface" to scratch coat/render onto. Make sure you "blind it" evenly overall,,, plus,,the more sand that sticks to the bitumin, the rougher/stronger the key!!
     
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  11. Richard C

    Richard C

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    Is that the right way to go :confused: soundS a bit like trying to stop the Titanic sinking from below decks :LOL:
     
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  12. roughcaster

    roughcaster

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    Good point Rich',,, any cement render related work would be "after" the problem with the water ingress was fixed
     
  13. roy c

    roy c

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    Believe or not Rich. We used to do that quite a lot in the early 80's when I was doing damp-proofing and preservation work. We used to use "syntapruf" which I think is now called "black-jack,(I think there is a post where we discussed this before).I think it was alistairreid who was into the preservation game aswell.
     
  14. Richard C

    Richard C

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    Still got 1/2 tin of that in me garage :LOL:
     
  15. roughcaster

    roughcaster

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    It'll be "flat" by now,,, all the gas will be out of it!!!! :LOL: :LOL:
     
  16. Micilin

    Micilin

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    Definitely , you've got to try and divert the water first -I maybe wasn't clear enough in my post above.
     
  17. dmacca3

    dmacca3

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    when i have blinded it evenly and has dried is it ready to render
     
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