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Pavers over concrete base?

Discussion in 'Hardscaping' started by SVA_Concrete, Nov 10, 2010.

  1. SVA_Concrete

    SVA_Concrete LawnSite Senior Member
    Posts: 467

    Any thoughts on installing pavers on top of an existing concrete driveway?

    the elevation increase will work out fine with the existing grades, the driveway is in sound structural condition.

    1 inch of concrete sand and rock and roll? drill and spike snap edge through concrete/ and or 6" stone border as needed?

    thoughts/ ideas/ experiences?

    my gut says rip it out, (i can do concrete demo fast and easy) just so i have a clean slate to start working with.

    i appreciate any feedback!
     
  2. WGrnd21

    WGrnd21 LawnSite Member
    from NC
    Posts: 73

    rip it out, or use geotextile under bedding sand so the sand won't settle into cracks.
     
  3. ICT Bill

    ICT Bill LawnSite Platinum Member
    Posts: 4,116

    the downtown brick walkways in Washington DC are laid on top of concrete on purpose, they actually poured the concrete and then used a tar of some kind (I have no idea the make up) and laid the bricks on top of the tar mixture that was on top of the concrete, that was probably 20 years ago and they are still performing well

    I have never done it but I have seen it done, seems like the best base you could get and then by putting a water proof adhesive on top of the concrete you would have little to no heave
     
  4. DVS Hardscaper

    DVS Hardscaper LawnSite Fanatic
    Posts: 6,402

    Totally your call. Only you have seen it. Whats the condition of the concrete? How thick is the concrete? No, you dont have to reply with these answers, as I don't give a rat's a$$, I'm jus saying these are things you need to look at to decide the best road to take.

    You can go over the concrete.

    You can drill holes and spike the restraint into the slab.

    Or you can install an aggregate peremiter and set the restraint on the aggregate.

    We have successfully done BOTH.
     
  5. zedosix

    zedosix LawnSite Silver Member
    Posts: 2,628

    We have pl'ed snap edge to concrete to hold the pavers in. Saves a bunch of time.
     
  6. JimLewis

    JimLewis LawnSite Fanatic
    Posts: 6,830

    I have done it for patios - on concrete that I was sure was thick and stable. Went over it with aggregate, compacted the aggregate, and installed pavers like usual. But I'd never do it for a driveway. A driveway job is usually so big that the incremental cost to dig up the concrete with a backhoe and load it into a dumper and haul it away doesn't increase the overall cost of the job THAT awful much. It's just the right way to do it. I'd rather do it the right way and be $1000 or $2000 higher than do it the other way, taking a risk, and be a little cheaper.

    Look at it this way; if you're wrong and it isn't stable for some reason and continues to crack or settle under the new load - are you going to be willing to come back and re-do it in a year or two??? I know I wouldn't be.
     
  7. tthomass

    tthomass LawnSite Gold Member
    from N. VA
    Posts: 3,496

    We did one at my previous job over concrete and was probably about 10k sf. If there was a crack in the concrete, fabric was put down for about 10'. I would guess the concrete driveway was about 20-30yrs old and very solid. I don't recall what was done for the borders. Actually the first time I had worked with pavers. This was about 6yrs ago and it's still solid today.

    There's some guys here that only do pavers over concrete.
     
  8. SVA_Concrete

    SVA_Concrete LawnSite Senior Member
    Posts: 467

    I priced the job installing over the existing concrete, to those of you that have provided valuable thoughts and experiences , thank you.

    like i said the concrete is in great structural shape, hopefully i can post some good before and after shots soon :)
     
  9. tthomass

    tthomass LawnSite Gold Member
    from N. VA
    Posts: 3,496

    Where are you located?


     
  10. SVA_Concrete

    SVA_Concrete LawnSite Senior Member
    Posts: 467

    south east virginia, on the peninsula.
     

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