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What depth for wall and walkway?

Discussion in 'Hardscaping' started by mr.q, May 24, 2011.

  1. mr.q

    mr.q LawnSite Member
    Messages: 105

    I have had this question for a while but, how do you know what depth and what size the base needs to be for a retaining wall? Is is how high the wall is? Also does the same apply for a paver walkway or patio?
  2. shovelracer

    shovelracer LawnSite Silver Member
    Messages: 2,008

    The measurement front to back of your base should be at least double your block size. Depth is common at 6". This is for common walls. Not sure about when you get into super large commercial stuff.
  3. DVS Hardscaper

    DVS Hardscaper LawnSite Fanatic
    Messages: 6,602

    When you say "base" that's a broad term for wall.

    For me "base" is two parts totaling one component.

    Which is the aggregate and the base couse of block.

    Aggregate is usually 6-inches deep.

    Width for a 12" wide block is usually 24". With the block centered on that.

    Base course(s) is/are contigent to wall height, degree of slope, surcharge, soil type, and whether the toilet paper hangs over the front or hangs over the back. This is speced by an engineer.

    Posted via Mobile Device
  4. mr.q

    mr.q LawnSite Member
    Messages: 105

    Thanks for the input.
  5. andyslawncare

    andyslawncare LawnSite Senior Member
    Messages: 812

    It depends on the intended use. A pave stone driveway needs a deeper base than a pedestrian walk way. A commercial application will need to be larger than a residential application due to heavier traffic. Sub-base soil composition also needs to be considered--clay, sand, silt? Clay needs less base than sand. Usually go 6'' wider than a patio or path, and usually do walls with 24'' wide base for ease of adjustment. We compact our sub-base and use compacted crush and run, then 1'' of m-10 sand. Any wall over 4' (different in some areas) should be engineered, and the engineer will specify how much material. For a shorter wall, 6''-12'' is good.

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