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Cinder Block Corner Broken Off

Discussion in 'DIY Disasters' started by Viva_moz, 12 Jan 2016.

  1. Viva_moz

    Viva_moz

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    I've recently been renovating my house, starting in the spare room! Had to remove the plaster from the walls as it was cracked and slightly damp! When I was taking the beading off around the corner of the window frame a large corner of cinder block came with it....I was just wondering how I would repair this?
     
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  3. JohnD

    JohnD

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    How large? Is it on the inside towards the room? A photo would help.
     
  4. Viva_moz

    Viva_moz

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    I'm at work at the minute so can't get a picture but have drawn a diagram to give you an idea.....
     
  5. Viva_moz

    Viva_moz

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  6. JohnD

    JohnD

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    It looks very unstructural.

    Some people would just use filler.

    If it was me and the broken piece was available, I think I would prime both broken surfaces with PVA and stick it back with a cement/PVA/water paste, then when fully set, patch up the plaster with Easyfill.

    If you don't know how to patch plaster on a corner, you fix a batten lined up with the edge to give you something to press your trowel against. Do the two faces of the corner separately, otherwise it will bulge and sag.
     
  7. Viva_moz

    Viva_moz

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    I have the majority of the broken peice....but I've put it back in and it doesn't sit correctly! Im assuming other bits have fallen out so it wont line up! So would you say filling it would be better?
     
  8. JohnD

    JohnD

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    you could make up a bit of mortar with PVA, cement, water and soft sand. As well as sticking the piece back, the mortar can be pressed into any gaps between the pieces to fill the spaces. Instructions should be on the tub (they are on Unibond, at least). Prime the surfaces first.

    I prefer sand and cement for these little jobs. It stays workable for a long time and is strong. You will probably need no more than half a yoghurt pot full.
     
  9. Viva_moz

    Viva_moz

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    OK thanks! And what should I use to prime?
     
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  11. Viva_moz

    Viva_moz

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    May sound thick bit I've never repaired anything like this....my first renovation so need all the help I can get
     
  12. JohnD

    JohnD

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    prime with PVA thinned with water. Instructions on the tub, or google and I expect they have a factsheet.

    I just looked at the Unibond website and it doesn't seem to mention PVA any more.
     
  13. Viva_moz

    Viva_moz

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    OK! Well I will give it a go! Thanks for all the help!
     
  14. Brigadier

    Brigadier

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    I had a similar problem, although mine was caused by a leaking pipe saturating the block, which then spalled due to free-thaw action.

    After fixing the leak (to prevent further and future damage), I screwed a piece of plastering angle bead to the broken corner, then built up the missing material with wickes Concrete Repair. Once painted to match, looks like original.
     
  15. chappers

    chappers

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    But it's all getting re-plastered so don't worry about it, the plasterers will set a new bead up and can fill it out with bonding or hardwall
     
  16. ladiesman020

    ladiesman020

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    Concrete or cement it
     
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