![]() The two photos above contrast clean rock, which contains no fines, with minus rock, which does contain fines. Most gravel grids require permeable rock products, which are typically more expensive per ton than minus rock products.Ī typical gravel driveway is built with one or more layers of minus rock products-for example, 1¼” minus for the base layer and 5/8” minus for the top layer. With all of these steps in mind, you can see how installing a gravel grid can be time-consuming and labor-intensive. ![]() Some gravel grid manufacturers recommend the installation of a geotextile layer between the subbase and gravel base or between the gravel base and gravel grid.
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