Drainage for sunken patio

Discussion in 'Hardscaping' started by GreenMonster, Apr 1, 2006.

  1. GreenMonster

    GreenMonster LawnSite Silver Member
    from NH
    Messages: 2,702

    I'm hoping you guys can give me a few ideas for this patio. It's about 3 years old, and it's now very wavy. It's hard to say if the waviness is due to improper installation (I'm sure that's part of it), or collected water under the pavers, seeing that the h20 has nowhere to go.

    Homeowner states that water doesn't pool up, and does indeed drain. Not particularly surprising seeing that there are several large gaps, and it's a course sand in between and below the pavers. I don't know if it's a gravel base or not.

    The customer would like to regrade the base so the pavers can be reset properly. I'm a little concerned that something should be done with the water though, to avoid any future problems.

    I have a few ideas for drainage, but I don't know if they're any good. Does anybody have real life experience with this sort of situation, or any real suggestions that would work?

    BTW, I need to shoot the grade, but I believe the top surface of the patio is about 1'-1.5' above normal water level. Last fall when we had a lot of rain, the patio was probably below the water line.

    Also, the patio is pitched from the sliders to the timber steps.


  2. mbella

    mbella LawnSite Bronze Member
    Messages: 1,284

    Mark, is there a perimeter drain that leads to a sump?

    Did you shoot the elevations to determine if you have enough fall to direct the water somewhere else?

    Whoops, just read that you didn't shoot elevations.
  3. crab

    crab LawnSite Senior Member
    Messages: 633

    french drain ,plus perf pvc pipe to day light.that close to a pond you my find also you have problems with ground water,combined with a good freeze/ thaw cycle,there might not be a permanent fix.
  4. MarcusLndscp

    MarcusLndscp LawnSite Senior Member
    Messages: 634

    I'd be willing to bet that the base isn't suitable under there Mark. Everyone in the wolfeboro area are hacks anyway:laugh: ! I think your easiest option is to tie into the perimeter drain if you can. While you're there get rid of dem timbers too!
  5. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Try the houses Perimiter drain if its at all possible though from Picture #2, it almost looks like you can daylight it into the lakefront, but I'd shoot it first :laugh:
  6. MarcusLndscp

    MarcusLndscp LawnSite Senior Member
    Messages: 634

    I guess you'll see how the drainage is tomorrow when it rains on us all day huh Mark!
  7. kris

    kris LawnSite Bronze Member
    from nowhere
    Messages: 1,578

    Id pass on that job. Its going to cost the guy way more than original and I bet you are waisting your time even doing the estimate
  8. GreenMonster

    GreenMonster LawnSite Silver Member
    from NH
    Messages: 2,702

    We're already doing a wall and a softscape job here.
  9. sheshovel

    sheshovel LawnSite Fanatic
    Messages: 5,112

    I bet that patio post is rotting at the base too...or will
  10. Seabass2500

    Seabass2500 LawnSite Member
    from Indiana
    Messages: 15

    I wouldn't run the drain towards the lake unless you know the lake has an overflow at a certain height. If the lake rises the it will push up to the patio as well.

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