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Expanded galvanised mesh in blockwork -advice please!

Discussion in 'Building' started by Rob broom, 14 Oct 2021.

  1. Rob broom

    Rob broom

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    Hi all!

    I am currently building a 2 story extension.

    It’s a cavity wall, with 7n dense blocks outer leaf and a 3.6n aerated blocks for the inner leaf.

    What are peoples thoughts on expanded galvanised mesh?

    Do I need to use it in the blockwork?
    Is it vital?
    Is it overkill?
    Should I use it on only the inner leaf?
    Does it reduce the chance of the aerated blocks cracking?

    any suggestions would be welcome!

    thanks
     
  2. 23vc

    23vc

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    Why do you think you need it? It’s only used in specific, not very common situations
     
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  4. Rob broom

    Rob broom

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    Thank for the reply 23vc.

    To answer your question , I simply didn’t know if I needed it or not. I’m fairly new to building and I’m learning all the time.

    I built an extension last year and had a few cracks in the aerated blocks.

    fortunately, they havnt got any worse and I think they have settled.

    I wondered if I had missed a trick by not using mesh???

    I didn’t want to make the same error again, that was all.

    cheers
     
  5. 23vc

    23vc

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    Aerated blocks (in particular) are prone to the odd vertical shrinkage crack, totally normal and hard to avoid. Proper storage and correct mix helps but won’t totally eliminate it. I don’t think bedding mesh in the wall is the answer and after trying to lay a few courses you’ll agree…
     
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