Curved thermalite block retaining wall?

Discussion in 'Building' started by ABN, 6 Apr 2021.

  1. ABN

    ABN

    Joined:
    12 Sep 2005
    Messages:
    202
    Thanks Received:
    0
    Location:
    Surrey
    Country:
    United Kingdom
    Looking to build a retaining wall aprox 600mm high using thermalite blocks as roughly shown by the position of the bricks laid on the ground.

    The inner circle has a 2M diameter, decking will be laid in there. The outside will be a 5M curve. The “spokes” coming out at the top is where built in seating will be fitted, and repeated on the left.

    It will the be rendered.

    In order have a smooth rendered finish I was thinking of laying the blocks vertically and in order to get the required height cement a half block on top. All the blocks would therefore be butt jointed.

    Would this be strong enough?

    Or is there a better way to do it?

    IMG_20210406_171806.jpg
     
  2. Sponsored Links
  3. stuart45

    stuart45

    Joined:
    13 Sep 2008
    Messages:
    3,157
    Thanks Received:
    493
    Location:
    Somerset
    Country:
    United Kingdom
    I wouldn't use AAC blocks and render myself for a retaining wall.
     
    • Like Like x 1
  4. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    34,694
    Thanks Received:
    4,701
    Location:
    West Mids
    Country:
    United Kingdom
    Like this?

    [​IMG]
     
    • Thanks Thanks x 1
  5. ABN

    ABN

    Joined:
    12 Sep 2005
    Messages:
    202
    Thanks Received:
    0
    Location:
    Surrey
    Country:
    United Kingdom
    Lol that made my day :)

    Why not AAC blocks and what would you use?
     
  6. stuart45

    stuart45

    Joined:
    13 Sep 2008
    Messages:
    3,157
    Thanks Received:
    493
    Location:
    Somerset
    Country:
    United Kingdom
    The render will normally fail quickly as the moisture comes through and freezes. You could do a 9 inch brick wall with some of those older bricks and a drainage system behind, or a drystone wall.
     
  7. Sponsored Links
  8. ABN

    ABN

    Joined:
    12 Sep 2005
    Messages:
    202
    Thanks Received:
    0
    Location:
    Surrey
    Country:
    United Kingdom
    Had not thought about that :(

    Just a little background. We live in a mid terrace house with no rear access and I am 71yrs old. The thought of carrying 4x the materials, mixing 4x the amount of cement and laying 4x the number of bricks is kind of off putting. That was the only reason for using block work. The thermalite was only chosen because it was much lighter than the other alternative block,

    Would tanking the inside fix the render problem? If so would the wall be, built butt jointed as suggested be strong enough.

    Also since its standing on earth would weep holes be needed as it would make tanking less effective.
     
  9. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    34,694
    Thanks Received:
    4,701
    Location:
    West Mids
    Country:
    United Kingdom
    You can get a concrete block that is as light at a thermalite. But whether local merchants stock them is another matter.

    The problem with your plan, is not really the sticking of the render - that can be an issue but it can be overcome, but more so the fact that in your design the blocks will move slightly and this will cause cracking at the joints. So you really need a properly bonded and thicker wall to deal with this.
    Or potentially you could line the face with a mesh prior to rendering or a suitable board such as Marmox curved multiboard

    You can line the back with polythene if any soil is to be placed against them
     
    • Thanks Thanks x 1
  10. ABN

    ABN

    Joined:
    12 Sep 2005
    Messages:
    202
    Thanks Received:
    0
    Location:
    Surrey
    Country:
    United Kingdom
    That Marmox curved multiboard looks VERY interesting and would solve many problems and make the rendering much easier, will look into it :)

    Normally like to see and touch things before buying to get a feel for them. But with the hidden block work would be happy to just order off of the internet. What block would you recommend?
     
  11. cdbe

    cdbe

    Joined:
    22 Nov 2009
    Messages:
    1,489
    Thanks Received:
    261
    Location:
    Oldham
    Country:
    United Kingdom
    Have you considered vertical sleepers? Still some work and a decent trench and some concrete but could be easier than a masonry wall with suitable foundations.
     
  12. ABN

    ABN

    Joined:
    12 Sep 2005
    Messages:
    202
    Thanks Received:
    0
    Location:
    Surrey
    Country:
    United Kingdom
    Thinking outside the box I like it :)
    Yes we had concidered it and also 75mm round fence posts but didn`t think we would like the look.
     
  13. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page