new block wall

Discussion in 'Hardscaping' started by gobblet, Oct 31, 2009.

  1. gobblet

    gobblet LawnSite Member
    Posts: 155

    I just removed a 30ft.x4ft. high railroad tie wall. Question is: shall I still need to bury first row of block competely underground as the earth is near concrete from previous wall? As of now if I place a thin base coat of sand to level block, block is only buried about 2-3 inches below asphalt driveway.(block measurement 12"D 6"H 16"W)
     
  2. DVS Hardscaper

    DVS Hardscaper LawnSite Fanatic
    Posts: 6,430

    rule of thumb is you bury 1-inch of block for every 12-inches of wall height.

    However, we usually always bury the entire block for piece of mind.
     
  3. gobblet

    gobblet LawnSite Member
    Posts: 155

    forgot to add, new aspalt driveway will be placed right next to wall. Does this add some stability for wall?
     
  4. gobblet

    gobblet LawnSite Member
    Posts: 155

    forgot to add, new aspalt driveway will be placed right next to wall. Does this add some stability for wall?
     
  5. DVS Hardscaper

    DVS Hardscaper LawnSite Fanatic
    Posts: 6,430

    No. if the block is not correctly buried, the asphalt won't keep the surcharge from bearing against the block and possibly tilting the block forward.

    Also, the asphalt driveway will need replaced in 15 - 20 years.
     
  6. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    I go with at least 6 inches of crushed and compacted base material and then bury the first course.
     
  7. GrazerZ

    GrazerZ LawnSite Senior Member
    Posts: 670

    you need to do it right or else don't do it. I see segmental retaining walls everywhere that are falling apart because they were not installed properly.
    You will need to make sure the base is going to be appropriate, and therte is plenty of drainage for the wall. A 4' wall is the maximum height you can build without an engineers approval here, so make sure you do it right.
     
  8. asalow

    asalow LawnSite Member
    Posts: 46

    dito, sand isn't enough
     

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