Rock Depth

Discussion in 'Landscape Architecture and Design' started by dtelawn, Nov 22, 2009.

  1. dtelawn

    dtelawn LawnSite Member
    from Alabama
    Posts: 113

    Two part question. How deep should I expect to make River Pebbles(2-4 inch) in beds. Should I use fabric under them. No additional flowers or bushes will be put in after this initial planting. I guess I am asking more of an opinion from others.
     
  2. AGLA

    AGLA LawnSite Bronze Member
    Posts: 1,740

    The bigger the stone, the deeper the minimum depth. If you have big stones (don't go there) there will be big gaps between them when you lay them 1 stone deep . That means that you'll need at least a second layer of stones to cover the gaps. If you have 3/8" inch stone you can fully cover in less than an inch. That won't happen with 2-4" stone. You'll probably need at least 4".

    I remember this from working for a guy who priced covering a McDonald's landscape with river rock. He estimated the materials at 1". It took three inches so that the black weed cloth did not show up and look rediculous. ... not a lot of profit on that job. ... not to mention that it was a real pain in the neck to spread big stone on cloth. The loader wheels turning and the weed cloth were not a good combo. ... neither were shovels, wheel barrows, and rakes. That job totally sucked.
     
  3. 93Chevy

    93Chevy LawnSite Fanatic
    Posts: 37,805

    Yeah, I always use weed block with river gravel. I never do with mulch, but always gravel. I'd say 4" is about good for #3 gravel. You don't want to have it too thin.
     
  4. LindblomRJ

    LindblomRJ LawnSite Silver Member
    Posts: 2,570

    3/8" pea rock 2" will cover.
    2" river will need 3 or 4 to cover well. And yes use a good barrier if you are laying down rock. For mulch nope...
     
  5. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Only thing I might add is using a bigger rock rather than a pea-gravel type of mulch.

    The reason being is that the smaller rock generally doesn't stay in place, ever. Especially when you use a leaf blower on it.
     
  6. AGLA

    AGLA LawnSite Bronze Member
    Posts: 1,740

    He is using 2"-4" stone. The other sizes were references for describing why he needs to calculate for a deeper application and what happens if he does not.
     
  7. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    He just made a reference to river "Pebbles" and I think that's what stuck out in my mind.
     
  8. dtelawn

    dtelawn LawnSite Member
    from Alabama
    Posts: 113

    Thanks for the info. The customer requested the larger 2-4 inch stones. I am excited about the size of the job, but I know how much of a pain it will be to get all the rock put in and spread. There is is a few places where equipment will not fit into. Well thanks again for the input.
     
  9. LindblomRJ

    LindblomRJ LawnSite Silver Member
    Posts: 2,570

    I hate to split hairs and point out things, rocks really do not constitute mulch. Mulch generally will amend soil quality. Just saying. :)
     
  10. White Gardens

    White Gardens LawnSite Fanatic
    Posts: 6,776

    Yes and no. Some people consider rock as a mulch generically. I've heard it referred to as mulch by other professionals in discussion before.

    I agree, rock isn't mulch. The only similar characteristic to wood mulch is that it will help stabilize the moisture in the soil and that's about it. I only refer to it as mulch in discussion generically.

    All semantics I guess, or, splitting hairs. :laugh:
     

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