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foundation for wall

  • 26-07-2018 5:14pm
    #1
    tech
    Registered Users, Registered Users 2 Posts: 2,860 ✭✭✭


    looking at building entrance walls about 18" wide, just wondering what wide / depth foundation should I dig?

    I was told 30" wide by 12" deep , should I go wider? and deeper?


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,339 Mod ✭✭✭✭Gumbo


    tech wrote: »
    looking at building entrance walls about 18" wide, just wondering what wide / depth foundation should I dig?

    I was told 30" wide by 12" deep , should I go wider? and deeper?

    Who told you that? Your engineer?


  • #3
    tech
    Registered Users, Registered Users 2 Posts: 2,860 ✭✭✭tech


    the guy buiilding wall, what do you recommend?


  • #4
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,339 Mod ✭✭✭✭Gumbo


    tech wrote: »
    the guy buiilding wall, what do you recommend?

    I’d recommend get an engineers opinion on site.
    The home bond manual may provide some
    Guidance also assuming ground conditions are normal.


  • #5
    Ronney
    Registered Users, Registered Users 2 Posts: 857 ✭✭✭Ronney


    As a general rule the foundation width should be 3 times the wall width, so you have essentially the width of the wall free either side of the foundations.

    Dept would depend on the wall height but 12" sounds fairly standard assuming its good ground.

    you also want aprox 1/4 height of wall under finished ground level.


  • #6
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,881 ✭✭✭✭Calahonda52


    Ronney wrote: »
    1 As a general rule the foundation width should be 3 times the wall width, so you have essentially the width of the wall free either side of the foundations.

    2 Depth would depend on the wall height but 12" sounds fairly standard assuming its good ground.

    3 you also want aprox 1/4 height of wall under finished ground level.
    Where does 3 come from?

    Op,
    18" wide? what material?
    it also depends on the height of the wall and how much wind load it might take

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



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  • #7
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Ronney wrote: »
    As a general rule the foundation width should be 3 times the wall width, so you have essentially the width of the wall free either side of the foundations.

    Dept would depend on the wall height but 12" sounds fairly standard assuming its good ground.

    you also want aprox 1/4 height of wall under finished ground level.

    https://www.boards.ie/vbulletin/showthread.php?t=2055036302

    Please read section 1.5 & 2. before posting again. Thanks


  • #8
    Lumen
    Registered Users, Registered Users 2 Posts: 31,218 ✭✭✭✭Lumen


    Is it allowed to post links to engineering spreadsheets?

    I'll report my own post just in case.

    I found this site quite useful for rough calculations and to dissuade me from thinking that engineering is simple.

    http://www.yourspreadsheets.co.uk/masonry-freestanding-wall-quick-spec-to-bre-gbg-14.html#PhotoSwipe1532982120579


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