cement patio

Discussion in 'Lawn Care/Landscaping' started by janetcal, Aug 29, 2010.

  1. janetcal

    janetcal New Member

    Messages:
    12
    Location:
    Pennsylvania
    Has anyone ever seen or heard of pouring a cement patio on top of dirt instead of on rock? We live in Western Pennsylvania.
  2. Fireguy97

    Fireguy97 Irrigation Contractor

    I've heard of it, I've seen it done, but I'm an Irrigation Contractor not a Landscaper, or a concrete guy. Do you mean gravel, or rock? I know that if you did pour over soil, it would still have to be compacted, and very stable to start with.

    Mick
  3. Terry

    Terry Administrator Staff Member

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    15,412
    Location:
    Bothell, Washington
    Last edited: Sep 2, 2010
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,273
    Location:
    Land of Cheese
    If you live in an area in which the ground freezes and thaws in the winter it would be a big mistake.
    The high moisture content often found in soil causes it to expand greatly when it freezes & then the slab will heave and crack.

    Rock or gravel is used as a proper base because it allows water to quickly drain and moisture to dry outward.
  5. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Use concrete not cement, and use rebar, and ensure the subgrade is well compacted.
  6. hj

    hj Moderator & Master Plumber Staff Member

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    27,230
    Location:
    Cave Creek, Arizona
    Unless the dirt has been disturbed, it is probably as compacted as it is going to get. Many people use the terms cement and concrete interchangeably, even though one is a subset of the other.
  7. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    I'm just clarifying because I've seen people mix straight portland cement with water and expect it to work like concrete.

    Cement is an INGREDIENT in a concrete mix.
  8. janetcal

    janetcal New Member

    Messages:
    12
    Location:
    Pennsylvania
    yes we used 2 inches of rock over the dirt and will pour 4 inches of cement.... I wanted 4 inches of rock and 5 1/2 inches of cement but contractor says we dont need that much because it is a patio and not a driveway.. Im just concerned about the winters here in western Pa.. I know the first year is crucial so that the cement dont crack.. someone told me to also get some hay or straw and leave it on the corners of the patio after the cement has dried to cure the patio.. anyone hear of that? thanks for the feedback
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