raised patio question

Discussion in 'Hardscaping' started by captaingreen, Apr 15, 2008.

  1. captaingreen

    captaingreen LawnSite Senior Member
    Posts: 471

    I've built several retaining walls and only one patio. We are bidding on a small raised patio for a customer and I think I already know the answer to this question but need to check to be sure. When you have completed your retaining wall and begin base for the patio, how do you deal with drainage behind the wall? We usually use perf. pipe and 1" clean aggregate along with soil sep. fabric. Do you fill with road base behind the wall and compact or still put some clean behind the wall. Our wall is only 1 foot tall and a 500 sq. ft. paver patio. Also with the soldier course on the patio I was planning on using adhesive where it joins with our wall block, any other suggestions?

    SOUTHERNGREENSCAPES LawnSite Senior Member
    Posts: 763

    If you pitch the patio correctly you don't necessarily have to put drainage behind the wall b/c you will be sealing the top with an unpermeable surface. If you do decide to drain it, then just build the base to the bottom of the pipe with road base then the rest with clean stone. just make sure to use road base on top of the clean to provide a good bed for your sand.
  3. captaingreen

    captaingreen LawnSite Senior Member
    Posts: 471

    Awesome. Ya, I was kinda wondering since we put polymeric sand over the patio if any drainage behind the wall would be neccasary.
  4. orionkf

    orionkf LawnSite Member
    Posts: 122

    Suggestion: Use adhesive between your block and cap. Don't use adhesive anywhere else.
  5. captaingreen

    captaingreen LawnSite Senior Member
    Posts: 471

    Ya, maybe I worded that weirdly.

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