Decomposed granite (DG) is a granular aggregate material resulting from the natural weathering of granite rock, which breaks the stone into particles ranging from fine dust to small gravel (fines). DG has become a popular choice in residential and commercial landscaping because it provides a permeable, natural-looking surface. It is highly desirable for creating pathways, patios, and ground cover. Understanding the types of DG and where to source them efficiently is the first step toward a successful outdoor project.
Choosing the Right Type of Decomposed Granite
The intended use of the material dictates the specific type of decomposed granite required for a project. The two main categories are Natural (Loose) DG and Stabilized DG, each possessing distinct properties. Natural DG is the raw, unaltered granite fines that compact to a relatively firm surface but remain susceptible to water erosion and shifting. This loose form is best suited for ground cover, xeriscaping, or as a mulch alternative around planting beds where water permeability and a soft texture are prioritized.
For applications involving foot or light vehicle traffic, such as walkways, driveways, or patios, Stabilized DG is the preferred choice. This material is pre-mixed with a binding agent (typically a polymer or natural resin) that chemically locks the particles together when moistened and compacted. The stabilizer drastically reduces material erosion, minimizes dust, and prevents the surface from washing away during heavy rain. While stabilized forms are more expensive, their enhanced durability and reduced maintenance often justify the higher initial cost.
Locating Suppliers for Different Project Sizes
The scale of your project directly influences the most economical and practical source for purchasing decomposed granite. For large-scale installations, such as long driveways or expansive patios, buying in bulk is the only feasible option. Bulk Suppliers include local landscape supply yards, regional material distributors, and sometimes the quarries themselves. These suppliers sell DG by the cubic yard or by the ton, which is significantly more cost-effective than bagged material.
When dealing with bulk suppliers, specify whether you need the loose or stabilized form, as they often stock both. These vendors may also offer a wider variety of regional colors (such as gold, gray, or reddish-brown hues) determined by the parent rock’s mineral composition. Conversely, for small repairs, joint filling, or minor garden beds, Retail Suppliers are a better fit, including large home improvement chains and local garden centers.
Retail suppliers almost exclusively sell DG in pre-packaged bags, typically 40 or 50 pounds. This is convenient for smaller quantities but results in a much higher cost per volume. While the color selection may be limited to one or two common varieties, the material is immediately accessible without requiring a large truck for transport. Sourcing unique or less-common colors, particularly stabilized varieties, may require contacting specialty aggregate distributors who can ship the desired material directly.
Logistics and Cost of Acquisition
Before placing an order, accurately calculating the required volume is necessary to avoid costly over- or under-ordering. Begin by determining the project’s square footage and the desired depth of the material; for pathways, a minimum compacted depth of two inches is typically recommended. The volume of DG is usually sold in cubic yards or tons, requiring a conversion from the initial length, width, and depth measurements.
It is necessary to factor in a compaction rate, often between 10% and 20%, because the loose material will compress upon installation to create the firm surface. This means you must order more than the calculated final volume to account for the material density and settling. The cost of acquisition involves not only the price of the material—which varies widely based on stabilization, color, and local availability—but also the logistics of transport.
Bulk purchasing often requires paying a separate delivery fee, which can be substantial and may involve minimum order requirements. Alternatively, you can arrange for pickup, but this necessitates a heavy-duty truck or trailer capable of safely hauling material that weighs approximately 1.2 to 1.5 tons per cubic yard. The final price per unit volume will always be lower when buying bulk, with bagged material costing several times more for the equivalent amount of DG.