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I have a driveway with trap rock on it. I have having some drainage problems. How can I tell if the driveway was installed properly. I have been reading that certain sized rock should have been put down first and then smaller size rocks and then the top trap rock. If I dig down, can I tell if the guy installed it right? What if he did not install it right. I have a guy who just wants to add trap rock and not deal with the drainage problems. can you help here. thanx

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  • pquin1 Jun 09, 2010

    I was asking about a driveway install, there is no user manual involved here. There are basic procedures to follow for driveway installation and I was trying to find out how that is normally done.

  • pquin1 Jun 12, 2010




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You can only tell this if you are able to consult the manual to see if the assemble is in order, because it is possible that the guy might be missing something out and from the user manual you can tell this, atleast it will guide you to see where the fault lies.

Take care.

Posted on Jun 09, 2010

  • Sulaimon Jimoh Olayemi Jun 10, 2010




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    Investigate the "delivered cost" of materials for your driveway. Hot
    mix asphalt is usually the cheapest material that can be used. If it meets your
    criteria, there are many advantages. It will last 20-30 years, it's more
    flexible than concrete, is the cheapest of all materials and is less prone to
    damage by debris than any other material. Get several estimates from local
    contractors for each type of material you are considering for your driveway.

    Decide which material will be used for the driveway contruction. Once that
    decision is reached based upon price, availability of materials and the
    identification of a good contractor to actually perform the work, only two
    steps remain prior to your new driveway installation: removal of the existing
    driveway (if one exists) and the design, preparation and layout of the new
    driveway. The design, preparation and layout steps are similar regardless of
    the type driveway installed, with minor changes depending on the material to be

    Remove the old driveway. This service is usually negotiated for a fee with the
    new driveway contractor, however, it is always best to get several quotes to
    have the job done. Sometimes a hungry contractor will give you a low price with
    the hope of acquiring more work at a later date.

    Grade the new driveway location so that the bare soil is smooth and
    compacted to a depth of nine inches below grade. The new driveway contractor
    will usually perform this as part of the installation price you were given, but
    make sure that is the case. This below-grade layout should mirror what the
    finished driveway will look like with all the curves, bends and straight runs.

    Install six to eight inches of aggregate base on top of the compacted soil in
    the driveway layout. The aggregate base will hold the asphalt (or other
    material), and prevent holes and other weak spots from developing over time in
    the finished surface of the driveway. The aggregate base should also be
    compacted in place before any asphalt (or other material) is laid.

    Install the asphalt (or other) paving. The job is usually done very quickly by
    a good contractor because the "working window" for asphalt is very
    short. Most driveways can be laid in under 30 minutes, but extra time is needed
    to compact the asphalt, smooth it up and clean up. Allow 24 hours to pass.

    Take care.


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Well I did some research on trap rock and it can be large almost like a paver, and maybe that's what you have, or it can also be crushed. I'm not sure which scenario you have. A drive way many times is very solid underneath your stone from being driven on and doesn't retain much water, like in your grass where the soil is soft. Smaller stones can be used and may help you can check your rock layers to see if they were used but the pitch of the land and depth matter most. The water needs to flow somewhere, if it puddles up it will just lay there. With my driveway I could not get that pitch so I put a channel drain in the ground and ran a pipe under my driveway through a trench into a 3 ft pit filled with rock. You can research french drains online. The water will only go as deep as your rocks are and then lay there if the ground is not pitched.

Posted on Jun 09, 2010

  • pquin1 Jun 09, 2010

    Can you tell me what a channel drain is. I know what a french drain is. I read online that the driveway installer was supposed to put stone first, then smaller stone and then trap rock. I think that the guy just threw on some trap rock. I do have pitch, I just think that guy did it wrong. Do you know if you have to place rock on the bottom of the driveway or can they just throw trap rock on the driveway alone. Its kind of important, because if they installed it wrong, I will have someone do it right or I can always put some sort of drain in. Seems easier just to do it right than to put in a drain. What do you think?

  • ElectricMan
    ElectricMan Jun 09, 2010

    I can't be positive about the rock layers, but I can tell you that layering the rock makes a lot of sense to me, because the more layers of rock you have the more the water has to seep down through and dissipate. The larger the stones are the faster the water will seep through them. There is a website that I've included that I think will be very helpful
    to you. Its not about the gravel on the driveway, its really about the
    preparation to your driveway that wasn't done. Pitch is the most important thing, water will always seek its own level, so no matter how many layers of rock you have the water will follow that pitch. You can check out a channel drain at the web link listed at the end of this comment. They are used to drain puddled water out into a french drain, as a french drain usually accepts water from a rain gutter pipe not the ground. I needed to use one in my own back yard because I have an old house and the lay of the land pitches back toward my house and the water would puddle up in my back yard.



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