Different projects require different types of stone/gravel. Here at A.G. Landscape Materials, Inc. we are often asked “What type of gravel should I use for this?” and “What’s the difference between this gravel and that stone?” Hopefully I can shed some light on this subject.
For construction projects, like patios, a good base is CA6—Grade 8, sometimes called driveway stone or crushed limestone. Grade 8 is a fractured stone with fine particles that lock together. After slightly moistening this gravel, it compacts tightly together making it a perfect choice for a base for concrete patios, driveways and walkways, for brick paving and retaining wall base. The particles are approx. ¾” in size down to dust. This is also helpful in laboring because the shovels go into the piles or can move the Grade 8 relatively easily.
At the quarry, this material is also screening separately into Limestone Screenings (Fines) and ¾” Washed or CA-7. The CA-7 is ¾ of an inch in size and is a good gravel to use in drainage or wet situations as water can pass through it and the fractured edges can lock together and still provide support for structures or vehicles. CA-7 is a good choice for under a shed in wetter areas or as a base when vehicles will be driving on it or parked on it.
Limestone Screenings make great pathways and bike trails. If you travel down the Illinois Prairie path, you’ve traveled on Limestone Screenings. The finer size is easy to smooth out. In wet areas; however, this material can change into ether a wet cement-like or a mashed potato-like consistency and may need heavier or larger rock added. In the past, many people and contractors alike used Limestone Screenings as a base for brick patios or walkways. Personally, I don’t suggest that application. My recommendation is to use 4” – 6” of compacted Grade 8 for pedestrian areas and 6” – 12” of compacted Grade 8 for vehicular areas with a 1” layer of bedding Torpedo Sand atop the compacted gravel.
There are several styles of Drainage Rock which often double as Decorative Stone. 1.5” Washed Rounds, ¾” Washed Rounds, and Pea Gravel are the most common of this type of stone. All of these stones have several uses, in addition to their outstanding drainage use; these types make excellent dog runs. Pea gravel can be used for pathways and like the ¾” Washed Rounds make an excellent ground cover below decks. This is also the very best stone to use in French Drains. The 1.5” Washed Rounds is an excellent alternative to Decorative Stone.
There are so many sizes, styles, and colors of Decorative Stone that it would be impossible to list them all or even cover the stone we sell here at A.G. Landscape Materials, Inc. in this blog. Our personal favorites here; however, are American Heritage, Meremac, Lava Stone, White Marble, Western Sunset, and Tiffany Pink. Each of these stones has a uniqueness that helps solve most landscape situations in their own right. Some stone, like American Heritage, are heavy and round which works well during fall leaf removals where strong blowers are used to remove leaves and the stone stays because it is heavy. Where color is the determining factor, Lava, Western Sunset, or Marble are popular choices. We highly recommend that you view the Decorative Stone in person, prior to purchasing it.
We also recommend that if you have any doubts about what type of stone or gravel to use in your project, talk to a professional. Here at A.G. Landscape Materials, Inc. we love to talk to our customers. We want to ensure that you get the right stone that you can drain through, build on, or highlight your landscape, to give you that unique look that sets your property apart from everyone else’s.
