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Mix of plasterboard and bonding

Discussion in 'Plastering and Rendering' started by furpho, 4 Apr 2020.

  1. furpho

    furpho

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    upload_2020-4-4_10-16-46.jpeg Hi, normally I would fashion a board or two to fit in here or entirely fill with bonding. In the current situation i haven’t got enough of either. If I fill 70% with a couple of pieces of board and fill in the gaps with bonding will it crack later.

    I have plenty of multifinish
     
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  3. Bonni

    Bonni

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    Just put scrim tape over the area where bonding meets plasterboard.
     
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  4. furpho

    furpho

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    Thanks Bonni.
     
  5. NickB_99

    NickB_99

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    Faced with that task I’d bite the bullet and get some more bonding, and use some EML.
    There looks to be a concrete lintel with a crack where it meets the bricks. This could probably do with EML at the end as cracking can be quite common later otherwise. It would cover well with bonding/EML.
    Also joining with existing - Stanley knife to cut back a bit to straighten/remove any lose at the edge. Scrim where new bonding meets old before skimming.
    With similar undercoat materials, less chance of cracking later too.

    You may get away with the mix of p/board and scrim, as you plan, but if it cracks later after decorated etc, I’d be a bit miffed.
     
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  6. roughcaster

    roughcaster

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    Absolutely spot on NickB, exactly what I would do as well.
    Doing it that way, the job would be far stronger too. It'll take a bit longer to dry out, but at the end of the day, it's all one thickness of plaster, instead of bits and pieces of plasterboard, covered in plaster.
    Do it the way NickB says, wire lath, bonding coat, then finish it off with multi finish.
     
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  8. furpho

    furpho

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    Sounds like sound advice. I’ll see what I can do to get some more bonding. Thank you for taking the time
     
  9. roughcaster

    roughcaster

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    Furpho, the "EML" that NickB mentioned is better known as "wire lath". It's galvanised, and comes in 8ft x 2ft sheets. For your job, I reckon one sheet would do, around £12.00 per sheet. The lintel above the door looks wooden, so you would DEFINETLY need wire lath over that, also, as Nick said, there's a crack on the left side of the blockwork. With that crack, i'd chisel it out a little, point it up with a bit of cement, fix wire lath ove the whole area, the coat it out with Bonding, let it set, then multi finish, job done. Let it dry out, seal the plastered area with watered down matt emulsuon, 2 parts paint, 1 part water, then it's all ready to paper or paint.
    One other thing, sometimes when you have old brickwork, a scratch coat of sand and cement to seal in the old before you apply Gypsum plaster, helps to seal in any salts etc that might be in the old brickwork, that might come through the Gypsum plaster.
    A lot of info here, but worth a read.Let us lnow your thoughts mate.
     
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  10. roughcaster

    roughcaster

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    Furpho, I also forgot to add, use "galvanised nails" to fix the wire lath,,, one other thing,,, with an old WOODEN LINTEL, it can absorb moisture from the new plaster. If i'm going to plaster over one, i'll either give it good coat of "oil based undercoat" or bitumin, then fix the 'wire lath" to the wooden lintel.
     
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  11. furpho

    furpho

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    Comprehensive information on all aspects of my issue. Feel like I understand what I’m dealing with now. This is a great resource and much appreciated
     
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