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Portland tilled in for patio base...

Discussion in 'Landscape Architecture and Design' started by KCLandscape, Dec 30, 2004.

  1. KCLandscape

    KCLandscape LawnSite Senior Member
    Messages: 524

    Have a project I am looking at. Due to elevations I am wanting to remove as little native soil as possible. Does anyone know how much portland to mix and till with existing soil to get a suitable base?
    Thanks,
    Nate
     
  2. landscapingpoolguy

    landscapingpoolguy LawnSite Senior Member
    Messages: 821

    well ya wanna get some 3/4 under there for drainage too.
     
  3. KCLandscape

    KCLandscape LawnSite Senior Member
    Messages: 524

    Already have the drain issues worked out. I have installed over 100 patios, but never used straight portland tilled with the existing soil then tamped. Anyone else?? I need some answers quick to finish this quote.
    Thanks,
    Nate
     
  4. jhawk71

    jhawk71 LawnSite Member
    Messages: 184

    KCLanscape, if you don't mind me asking whats your business name that you go buy. I think you have done some work around where I live.
    Jhawk71
     
  5. KCLandscape

    KCLandscape LawnSite Senior Member
    Messages: 524

    Reaves Associates - We work in most of the local cities around here. How about you?
     
  6. jhawk71

    jhawk71 LawnSite Member
    Messages: 184

    I'm just a 15 year old, and work in my neighborhood around 119th and 69 highway. Plan to expand when I turn 16.
    Jhawk71
     
  7. Turf Medic

    Turf Medic LawnSite Bronze Member
    Messages: 1,073

    one bag of portland 94lbs per 25-30 sq feet, rototilled in, and then tamped
     
  8. UNISCAPER

    UNISCAPER LawnSite Bronze Member
    Messages: 1,426

    Unless the soil has a high rock content, you will be mixing two completley incompatable ingredients and it is going to fail. Also, the only portland mixes I know people are using is with sand or stone screenings in the level course of a wall, in areas of the country that are not subject to freeze/thaw.

    In all honesty, this sounds like a homeowner cooked up the design, every segmental concrete paver manufacturer I know of recommends a 1" minus base screeded over sand. If you are laying flagstone, that is best mortared over a 3 1/2" thick concrete slab, then grouted.
     
  9. mdvaden

    mdvaden LawnSite Bronze Member
    Messages: 1,946

    This is interesting.

    You actually add Portland Cement to soil?

    We just remove soil here and add a gravel or gravel/sand base for the concrete or mortar on the surface.

    Is that typical for your area?
     
  10. Turf Medic

    Turf Medic LawnSite Bronze Member
    Messages: 1,073

    My mistake for replying on the way out the door. The portland cement works in areas with sandy soil, will not work in heavy or clay types of soil. I made an asumption, that only the ratio of portland needed was in question.
     

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