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Help with garden wall bond

Discussion in 'Building' started by EdF_uk, 7 Jun 2021.

  1. EdF_uk

    EdF_uk

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    Hi everyone,

    I'm trying to build a retaining wall for our garden. We have a slope (back to front) of 447mm and I was planning on using hollow concrete blocks (440mm x 215mm x 140mm) so I can use rebar to tie them into the concrete foundation. I'm a wall virgin but I'm keen!

    My first question is in terms of the design. There are a number of corners (see image) and I was wondering whether it is best to account for the length of the blocks at this stage to avoid having to make lots of cuts etc? There is scope for the design to change to accommodate a full number of blocks etc rather than having to cut.

    My second question is to do with the bond. Is there a standard bond for this size/type of block? I can see it might be tricky at the corners.

    I'm not sure why I went for those blocks it just seemed like it might be right. I only have three course planned so maybe another block type would be suitable too?

    Any help/ pointers would be great.

    Cheers,

    Ed
    upload_2021-6-7_20-0-19.png
     
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  3. stuart45

    stuart45

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    Set out to work blockwork without cuts if you can. Lay them half bond.
     
  4. EdF_uk

    EdF_uk

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    Thanks Stuart. I want to lay the blocks like this so I guess I have to cut part of a block to get them to half bond?
    upload_2021-6-7_20-18-44.png
     
  5. stuart45

    stuart45

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    Sorry, misread the post as 215mm blocks. Lay them so the holes line up.
     
  6. EdF_uk

    EdF_uk

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    But I will still be left with an awkward length wont I? the blocks are 440mm long and 140mm wide. Will I not have to cut a smaller block to make it into half bond?

    Cheers,

    Ed
     
  7. stuart45

    stuart45

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    Put a cut in so it works bond. Doesn't have to be half bond as long as the holes work out for the rebar.
     
    Last edited: 7 Jun 2021
  8. ^woody^

    ^woody^

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    At the corners, I'd suggest you cut 75mm off the full block to get the bond rather than put a 75mm cut in next to the 140mm end block.

    Start at the most visible section and set the wall out dry, or measure the wall ends for the corners so that it works blocks. The 'T' junctions of the wall should be where you can bond over the centre of a block, so as to give even cuts either side of the bonded block, otherwise just use some tie wires to join it.
     
  9. stuart45

    stuart45

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    You can lay them at 1/3rd bond if it's easier.
     
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  11. ^woody^

    ^woody^

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    Not easier on the eye :cautious:
     
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  12. EdF_uk

    EdF_uk

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    Hi, thanks very much for the info. Is it something like this you were meaning? It makes sense to me now, by cutting the pieces it gets it to half bond.

    Is that what you meant?

    Cheers

    Ed
    upload_2021-6-8_14-34-56.png
     
  13. ^woody^

    ^woody^

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    No

    foto_no_exif (4).jpg
     
  14. EdF_uk

    EdF_uk

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    I see! I really appreciate your help, I think I'm almost there. Just need to sort the other edge out. Is what I've drawn here correct or would you cut the bottom block down?
    upload_2021-6-8_15-7-37.png
     
  15. ^woody^

    ^woody^

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    Yes that is the idea.
     
  16. EdF_uk

    EdF_uk

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    Thanks very much!
     
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