Rio Stone field guide
Gravel versus decomposed granite
Compare particle shape, fines, compaction, drainage, edging, stabilization, and maintenance instead of choosing by color alone.
A useful material request starts with a clear measurement, a defined use, and honest expectations about what still needs confirmation.
How the materials behave
Gravel is a broad family of loose or compactable aggregates whose behavior depends on size, angularity, and fines. Decomposed granite is weathered granitic material commonly supplied with a blend of particles that can compact. Neither name guarantees permeability, accessibility, load capacity, or a particular finish. Compare the actual product data and sample.
Choose for the traffic and section
Loose decorative gravel may suit planting beds but migrate on slopes or under turning tires. A compacted DG path depends on subgrade, base, lift thickness, moisture conditioning, compaction equipment, edge restraint, and drainage. Vehicle, pedestrian, wheelchair, pet, and barefoot uses impose different requirements; obtain qualified design guidance where performance or accessibility is specified.
Understand stabilization
Stabilized DG may be premixed or combined with a compatible binder, and products differ in application rate, moisture, curing, temperature limits, color change, and maintenance. A stabilizer cannot repair poor drainage, wrong gradation, weak base, or inadequate compaction. Follow the exact manufacturer's current instructions rather than assuming every binder works with every DG.
Compare quantities and upkeep
Calculate each layer at its designed compacted depth and keep base separate from finish material. Ask how loose volume relates to compacted placement for the selected product; do not use a universal factor. Compare raking, tracking, dust, erosion, weed management, replenishment, staining, and repair access before deciding. Confirm current lot color in dry and wet conditions.
Before requesting pricing
- Define whether the surface must remain loose, compact firm, drain quickly, support wheels, or provide a decorative cover.
- Ask for gradation and fines content; natural, screened, and stabilized DG are not interchangeable.
- Plan base, moisture, compaction, edging, slope, runoff, and maintenance as one system.
Frequently asked questions
Does DG always become a hard surface?
No. Gradation, fines, moisture, base, compaction, binder, weather, and traffic determine the result. Confirm the complete assembly.
Which material drains better?
The name alone cannot answer. Particle distribution, fines, compacted density, slope, base, subgrade, and outlet design control drainage.
Can I place either material directly on soil?
That depends on use and site conditions. Settlement, mixing, weeds, drainage, frost or expansive soil, and load may require excavation and a designed base.