Blown plaster

Discussion in 'Plastering and Rendering' started by Ssan diy, 20 Nov 2019.

  1. Ssan diy

    Ssan diy

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    Ive recently re skimmed a wall for some one and the backing was bonding on brick its now about 2 months down the line and its started cracking do i need to hack it all off and start from scratch or will a skim with tape over the cracks be sufficient enough
     
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  3. roughcaster

    roughcaster

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    Depends how bad the cracks are. Did you put the Bonding Coat on too?
     
  4. Ssan diy

    Ssan diy

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    No bonding coat was already there just cant get my head around as its never happened before
     
  5. roughcaster

    roughcaster

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    Ok, Did you put multi finish straight onto the dry Bonding, or did you prep it first?
    what are the cracks like, are they straight cracks, or are they like spiders legs, going in alk directions?
    A couple of pics would be great really.
    Plaster will crack if it dries out too quick, or if the undercoat underneath is not bonded to the wall, and moves.
     
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  6. Ssan diy

    Ssan diy

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    Sorry ent got pictures but yes its all like spiders legs yes i used pva2 coats 2 layers of multi finish
     
  7. roughcaster

    roughcaster

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    Ok,, sorry about all the questions. Did you let the first coat of pva dry, before you put on the second coat of pva?
    The cause of "spider cracking" like that is "too much suction"/ drying to quick".
     
  8. Ssan diy

    Ssan diy

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    Yeah i let the first coat dry in then applied the second coat when pva was tacky but would it take that long to start cracking
     
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  10. roughcaster

    roughcaster

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    Pity we couldn't see a photo. Every time i've seen spider
    cracks, it's been due to drying too quick, dry background, plastering near a radiator etc. Hard to say what's caused yours then. Sometimes, cracked plaster can be hollow underneath too, you'll hear the hollow sound if you lightly run the back of your hand/fingernails over the cracked areas.
     
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  11. Ssan diy

    Ssan diy

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    Ok so if i go there today n its hollow shall i knock them off and fill with bonding n then skim the wall again
     
  12. Ssan diy

    Ssan diy

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    If its hollow best to knock it of and start from brick you reckon or could i get away with some bits being hollow
     
  13. Ssan diy

    Ssan diy

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  14. roughcaster

    roughcaster

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    Hard to say what's caused those cracks.
     
  15. bobasd

    bobasd

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    are the first two pic cracks vertical and is the last pic crack horizontal?

    fwiw: thats a very poor skim finish.
     
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