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Garden retaining wall pillars

  • 26-04-2021 1:01pm
    #1
    cianw
    Registered Users, Registered Users 2 Posts: 9 ✭


    Hey,

    I'm in the process of digging foundations for two retaining walls. 400mm deep x 450mm wide.
    I'm going to lay solid blocks on flat. 440x100x215. So the wall will be 215mm thick and 1.2metres high.

    One wall is 5metres long and the other 7metres. Do I need any extra pillars or piers for strengthening these walls?

    Thanks in advance.


Comments

  • #2
    Fine Cheers
    Registered Users, Registered Users 2 Posts: 559 ✭✭✭Fine Cheers


    Not a structural engineer but if it was me I'd split both walls in 2 with a pier centred. Can always build the pier on the higher ground side so won't impact visually. Make sure to tank wet side of wall with dpm and provide drainage.


  • #3
    Calahonda52
    Registered Users, Registered Users 2 Posts: 13,151 ✭✭✭✭Calahonda52


    we don't do advice here but generally the foundation is 3 times the block width so 450 is too narrow
    Check the web for correct depth for below frost line
    How much load is going to be on the retaining wall: wet clay or gravel, with drainage

    “I can’t pay my staff or mortgage with instagram likes”.



  • #4
    TheBoyConor
    Closed Accounts Posts: 3,292 ✭✭✭TheBoyConor


    Fine Cheers wrote: »
    Not a structural engineer but if it was me I'd split both walls in 2 with a pier centred. Can always build the pier on the higher ground side so won't impact visually. Make sure to tank wet side of wall with dpm and provide drainage.

    The piers will be next to useless on the high ground side. They must go on the low ground side. That way the front of the piers act as the fulcrum of the lever.


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