Decomposed Granite (DG)
Also known as: DG, crushed granite fines, path fines
Decomposed granite, or DG, is granite that has naturally weathered into a mix of fine gravel and sand. It compacts into a firm, natural-looking surface and is popular for pathways, patios and drought-tolerant yards.
In simple terms
DG is crushed-up granite that ranges from pea-sized grit down to fine sand. When you spread it, dampen it and tamp it, the fines lock together to form a stable, earthy-toned surface you can walk and wheel on.
In depth
DG comes in three grades: loose (natural, no binder — best for mulch-style fill), stabilized (mixed with an organic or polymer binder for firmer paths), and resin-coated (a poured, almost pavement-hard finish). Particle sizes typically run from 1/4 inch down to dust. Proper installation means a compacted base, 2–3 inches of DG, light watering, and compaction in lifts. Edging is essential because loose DG migrates over time.
Why it matters
DG gives a permeable, low-cost, natural alternative to concrete or pavers — ideal for Placer County’s water-wise landscapes because it lets rain soak in rather than run off.
Common mistakes
- Installing DG without edging or a compacted base, so it spreads and rutts.
- Laying it too thick in one pass instead of compacting in 1–1.5 inch lifts.
Examples & uses
- Garden and park pathways with a natural, rustic look.
- Patio and seating-area surfaces under pergolas.
- Fill between flagstone or stepping stones.