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Foundation for Lean To

  • 02-08-2020 12:21pm
    #1
    fawlty towers
    Registered Users Posts: 90 ✭✭


    Looking to stand a 32*20 lean to. What size foundation do I need under the pillars. Pillars will be bolted. Thinking 2ft X 2ft X 1ft deep with mesh.

    Would this do. Also if there was rock would I stilled need to go 1ft deep


Comments

  • #2
    Cavanjack
    Registered Users, Registered Users 2 Posts: 2,642 ✭✭✭Cavanjack


    fawlty towers wrote: »
    Looking to stand a 32*20 lean to. What size foundation do I need under the pillars. Pillars will be bolted. Thinking 2ft X 2ft X 1ft deep with mesh.

    Would this do. Also if there was rock would I stilled need to go 1ft deep

    I’d go at lest two foot deep. You shouldn’t hit much rock at two foot imo


  • #3
    dzer2
    Registered Users, Registered Users 2 Posts: 2,956 ✭✭✭dzer2


    For any small shed I dig 1 mtr sq by 600 mm deep with mesh and put in hold down bolts.

    Bloody auto correct but never mind at least the leanto won't fall


  • #4
    J.O. Farmer
    Registered Users, Registered Users 2 Posts: 2,478 ✭✭✭J.O. Farmer


    dzer2 wrote: »
    For any small shed I dig 1 mtr sq by 600 km deep with mesh and put in hold down bolts.

    Seems a bit of overkill going that deep surely 600mm (2ft) deep would be enough.


  • #5
    patsy_mccabe
    Registered Users, Registered Users 2 Posts: 10,922 ✭✭✭✭patsy_mccabe


    dzer2 wrote: »
    For any small shed I dig 1 mtr sq by 600 km deep with mesh and put in hold down bolts.

    600 km's is a long way down. :D

    'If I ventured in the slipstream, Between the viaducts of your dream'



  • #6
    F5500
    Registered Users Posts: 76 ✭✭F5500


    Deeper than 1ft for certain.


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  • #7
    Cavanjack
    Registered Users, Registered Users 2 Posts: 2,642 ✭✭✭Cavanjack


    Any of the sheds put up here back in the 80’s and 90’s were dug three foot deep and the pillars sat into them.
    On uneven ground there could easy be a difference of a foot over the length of the shed so a foot deep would be nothing.


  • #8
    PoorFarmer
    Registered Users, Registered Users 2 Posts: 605 ✭✭✭PoorFarmer


    Last lean-to built here the auld lad buried tar barrels to floor level and filled them. 3 feet ish I'd say. Serious dose of overkill. Dug out with the pick and shovel too.


  • #9
    valtra2
    Registered Users, Registered Users 2 Posts: 739 ✭✭✭valtra2


    18 inches deep 3ft by 3ft is loads


  • #10
    Dunedin
    Registered Users Posts: 2,379 ✭✭✭Dunedin


    Width is more important than depth. I’d be happier going a metre wide and a foot/18” deep but that depends too on type of ground you’re digging.

    A lot of builders only go 12” on a house house foundation.

    And what are you saving. Jayus one Extra metre of concrete would put in a fair few bases.


  • #11
    lakill Farm
    Registered Users, Registered Users 2 Posts: 4,735 ✭✭✭lakill Farm


    fawlty towers wrote: »
    Looking to stand a 32*20 lean to. What size foundation do I need under the pillars. Pillars will be bolted. Thinking 2ft X 2ft X 1ft deep with mesh.

    Would this do. Also if there was rock would I stilled need to go 1ft deep


    Are you going putting up walls etc in time?

    I put up a 48 x 20 and I put in a full floor and where each of the 8 pillars I went to 18/20 inch deep


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  • #12
    RobinBanks
    Registered Users Posts: 947 ✭✭✭RobinBanks


    Do you always need a foundation for the RSJ's? Could RSJ be bolted directly to a 4in concrete floor? looking at building a lean to myself ontop of a silage slab.


  • #13
    domrush
    Registered Users Posts: 1,186 ✭✭✭domrush


    RobinBanks wrote: »
    Do you always need a foundation for the RSJ's? Could RSJ be bolted directly to a 4in concrete floor? looking at building a lean to myself ontop of a silage slab.

    The force of wind would pull the RSJ straight out of such thin foundation. Obviously this depends on the size of the shed.


  • #14
    RobinBanks
    Registered Users Posts: 947 ✭✭✭RobinBanks


    domrush wrote: »
    The force of wind would pull the RSJ straight out of such thin foundation. Obviously this depends on the size of the shed.

    oh right. i was thinking maybe when the shed is all fixed together and tied into the back of the other shed it wouldn't go anywhere. Thats why im not a builder i suppose!


  • #15
    lakill Farm
    Registered Users, Registered Users 2 Posts: 4,735 ✭✭✭lakill Farm


    RobinBanks wrote: »
    oh right. i was thinking maybe when the shed is all fixed together and tied into the back of the other shed it wouldn't go anywhere. Thats why im not a builder i suppose!

    I fixed mine to 6 inch base but as above where the rsj baseplate was I put in more concrete

    the wind will not always be a factor

    Face the low side towards the wind and even better if fully closed in


  • #16
    K.G.
    Moderators, Society & Culture Moderators Posts: 3,268 Mod ✭✭✭✭K.G.


    the depth is decided by the ground and generally i would nt put the rsj s much under ground so you keep going until you get good foundation and bring it up with concrete.the area depends on the whether its part of a full foundation or just pads.metre sq for just pads and a little less if its a long reinforced foundation


  • #17
    patsy_mccabe
    Registered Users, Registered Users 2 Posts: 10,922 ✭✭✭✭patsy_mccabe


    See the following;
    S.101, July 2016. (MINIMUM SPECIFICATIONS FOR THE STRUCTURE OF AGRICULTURAL BUILDINGS)

    See section B7 Concrete Foundations.

    You'll get it on the DAFF website. I can't attach as file too big.

    https://www.agriculture.gov.ie/farmerschemespayments/tams/farmbuildingandstructuresspecificationswordformat/

    'If I ventured in the slipstream, Between the viaducts of your dream'



  • #18
    Internet Police
    Banned (with Prison Access) Posts: 10 ✭Internet Police


    Push a few sticks into soft ground has far as they can go. Wattle and daub. Thatch roof. Will last a life time.


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