![]() ![]() Eventually, your free-draining gravels become filled with materials that stop water from flowing through it, which can turn your awesome driveway into a muddy, pothole-filled mess quickly. Without a geotextile, every time you drive over your driveway you are slowly pushing your driveway into the native soil on your site. The filter fabric works as a barrier between your gravel driveway, and the materials under it. ![]() 2.3 Other MaterialsĪs mentioned in Section 2.1, you will need a geotextile filter fabric between your base gravel and the native soil on your property. The surface layer should be at least 100 mm thick. You want an angular gravel (the more more broken rocks a gravel has, the more angular it is said to be) because the individual pieces of gravel in your compacted driveway will interlock and form a more cohesive and solid surface for you to drive on. A 20 mm crushed gravel is the ideal choice for the surface layer. The gravel on the surface of your driveway should consist of a small diameter crushed gravel. Geotextile filter fabric is required between the native material on your site and the base gravel. It is important that the base remains free draining, and does not collect water. In Calgary, we typically recommend an 80 mm crushed gravel for the base layer of gravels in a gravel driveway. The base should consist of well-graded crushed gravel with a fairly large maximum diameter. A thickness of around 200 mm (8 inches) is recommended for the base layer. The gravel base layer is the foundation of your driveway and should be the thickest layer of the entire cross-section. If you contact a geotechnical engineer they should be able to reduce the thickness of your driveway, and recommend cost effective materials such as geogrid to further strengthen your driveway. If you’d rather skip the engineer and just build a driveway that may be thicker than necessary, then read on.Ī typical, safe gravel driveway cross section is approximately 300 mm (12″) or thicker and consists of two separate layers: the base and the surface layer. Depending on the size of your driveway and how many materials you’ll need, this may be a cheaper approach. If you want to optimize this, you should really speak to a geotechnical engineer that can provide a cross section specific to the soil conditions on your site. By wrapping twine tightly around the stakes and attaching the stakes around the border of the driveway, you can more easily visualize, measure, and excavate your newly planned gravel driveway.
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