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  1. #1
    Join Date
    Sep 2008

    Default Pergola Footings


    I am planning on putting in a 4 corner pergola in the back yard with each corner post being a 6x6 cedar post, about 9 feet high. I live in north Texas area, and the soil type here is maily clay. My question is how deep should I dig the hole for the post rest on the footing, being in clay soil. Any help would be greatly appreciated.
    Last edited by sralston; 11-11-2008 at 06:08 PM. Reason: cancel message

  2. #2
    Join Date
    Aug 2007

    Default Re: Pergola Footings

    Can't say for certain concerning your soils, but around here 4 1/2' would be the minimum recommended buried depth for a 9' tall post for this purpose.

  3. #3
    Join Date
    Jun 2007
    Fayette County, Ohio

    Default Re: Pergola Footings

    I agree with ****ie, you may not have to worry about heaving from frost but you do have to worry about wind shear. Each 9' 6 X 6 has 594 sq. inches on each face add the cross beams and you have a sizable sail in a strong wind.
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

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