11 foot steel post in concrete ?

Discussion in 'Landscaping and Outdoors' started by rexrapter1234, Nov 4, 2017.

  1. rexrapter1234

    rexrapter1234 New Member

    I have a steel square pole that is 11 feet height, 11cm depth and 11 wide.

    The post is for a wooden heavy gate which is 4 foot high and a bird house at 7 foot high from the ground.

    If I float the 11 foot steel pole in the concrete at 3 foot with bolts coming out of the steel pole at the bottem, would that work ? or would I need to put in steel bars in the ground with the concrete ?

    Also will be putting back top soil and there is lot of big rocks under the ground where I am digging the hole (there is an old building foundations in the ground where the hole will be.

    Thank for reading
  2. koolpc

    koolpc Well-Known Member

    You need to dig down at least 20ft. Reinforce the base with steel work. Steel beams and pour in the toughest concrete you can buy, flown in from Russia.
    Pollowick, DIYDave. and teabreak like this.
  3. rexrapter1234

    rexrapter1234 New Member

    The steel pole is only 11 foot.
  4. Isitreally

    Isitreally Active Member

    What you propose sounds fine.

    I hope koolpc was taking the p***
  5. KIAB

    KIAB Well-Known Member

    Wants to be in ground 450mm minimum & up to 600mm depending weight of gate.

    No need for rebar in hole, just a few bolts on post is enough.
    Last edited: Nov 4, 2017
  6. koolpc

    koolpc Well-Known Member

  7. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Don't think 18" deep is anywhere near enough for a steel 4x4 out the ground by 9½ feet, never mind the weight of the gate.

    If he has[11ft post] 8ft above ground, 3ft below, and 18" concrete at the bottom of the hole, I would think that minimum.

    Mr. HandyAndy - Really
  8. Pollowick

    Pollowick Well-Known Member

    11 what wide? Weeks? Lightyears? Angstroms?

    Maybe a little overkill ... but not much!
  9. koolpc

    koolpc Well-Known Member


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