Liner against a huge boulder?

Discussion in 'Water Features' started by JDUtah, May 13, 2011.

  1. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    I have a huge boulder in my front yard that is in no way moving (it's 4 feet tall or so, by a similar length). It will make an awesome center piece for a water feature (perhaps the beginning of a pond-less fall/stream).

    The question goes as follows, if I do run water down it how do I make sure that there will be no leaks where the liner meets the boulder? Is there an adhesive that will work well enough? I am also considering digging under it and setting the liner under it just enough and then encourage flow away from the boulder?

    In simple terms, if you can't lift a boulder and put a liner under it, how do you make a water feature out of it?

    I figured I would ask the professionals before attempting anything. I just bought the house and have yet to dig around and see how it sits. I will also get some pictures as time allows.

    Thanks in advance!
  2. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    ok so maybe the boulder isn't that "huge" in relative terms, but the question holds.

    What if I attach the liner to the boulder via concrete screws or something, and then paint with foundation concrete sealer or something?

    Just brainstorming
  3. tadpole

    tadpole LawnSite Bronze Member
    Messages: 1,221

    Can possibly be done in a couple of ways, but not enough info.


    What type of rock is the boulder?

    How much of the boulder (%) is buried?

    What is the shape of the boulder?

    POST PICS!!!
  4. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    Got the pics :)

    Not sure what type of boulder it is specifically, but it appears to be some sort of metamorphic rock. Boulder sits 12 inches or so in the ground. Shape and size should be covered by the pictures.

    If I do a pond-less stream it will be going from the boulder towards the street. On the side facing the driveway and walk to the front door I may engrave the house number or a saying of some sort.

    I took the hose to three sides of the boulder. Two are viewable from the road and one form the office window. I may drill a line to all three I may not. Any ideas or suggestions? How much flow do you recommend per side, what size hole would you recommend to allow the flow, etc.

    ALSO. is there a concern with various cracks in the boulder (you can see one of them in the pictures)? concerns with leaking water, frost wedging, or drilling holes?

    As this is brainstorming feel free to throw out ANY and ALL ideas, concerns, advice, etc.

    Thanks again in advance.


  5. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

  6. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

  7. tadpole

    tadpole LawnSite Bronze Member
    Messages: 1,221

    What an interesting looking boulder!

    And herein lies your problem. Because the surface of this boulder is SO irregular, it will be extremely difficult to make any liner attachment to the boulder Leak-Free.

    It would be so much easier to lift the boulder, place the liner beneath it and reset the boulder more perpendicular to the ground. Another factor to consider is, if you are going to drill a hole(s) for piping, you will need the proper equipment or sub it out to a concrete contractor.

    It would look great as a Water Feature, though.
  8. mxridernorth

    mxridernorth LawnSite Senior Member
    Messages: 306

    Drill it. Insert epoxied anchors and call in a crane.
  9. STL Ponds and Waterfalls

    STL Ponds and Waterfalls LawnSite Bronze Member
    Messages: 1,174


    And Yep!

    If you core drill it keep an eye out for fractures as you stated. Plus, if your able to lift it and put a liner under it pad that liner big time to keep the weight of the rock from puncturing it.

    As for the size for the outlet pipe I would at least go to 1.5" to make it look right for that size of boulder.
  10. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    Thanks guys! Couple more questions...

    1- If I do call in a crane and reset it, how would you orient it? (I know the answer may be hard to explain)

    2- How would you pad the thing to protect the liner?

    3- How much do cranes run in your area?

Share This Page