How to Install Decomposed Granite: Step-by-Step Pathway Guide

Decomposed granite (DG) offers a permeable, natural-looking, affordable surfacing for paths, patios, and driveways. Its warm, reddish-tan hue complements most architectures, and installation is a manageable DIY project with professional results.

Understanding Decomposed Granite

DG is granitic rock weathered into particles ranging from 3/8" down to fines. The fines bind when compacted, creating a stable yet permeable surface. Two main types:

• Natural DG: Loose, sandy; best for mulch, low-traffic areas
• Stabilized DG: Pre-mixed with binder (psyllium, polymer); firmer, resists erosion
• Resin-coated DG: Maximum durability; near-concrete hardness

Color varies by source: gold, tan, rose, gray, blue-gray. "Gold" is most common.

Materials & Tools

• DG: Calculate area (sq ft) × depth (ft) ÷ 27 = cubic yards; add 10-15%
• Weed barrier: Professional landscape fabric (not plastic)
• Edging: Steel, aluminum, bender board, stone, brick, concrete
• Base rock: 3/4" minus crushed rock (for unstable soils)
• Tools: Shovel, rake, tamper/plate compactor, wheelbarrow, level, string line

Step-by-Step Installation

Step 1: Plan & Measure

Mark path layout with paint or hose. Minimum widths: 3' (single), 4-5' (two abreast). Calculate material. Order 10-15% extra for settling and future touch-ups.

Step 2: Excavate

Remove all vegetation, roots, and organic matter. Excavate depth:

• Firm, well-drained soil: 3-4" (2" base + 2" DG)
• Clay/poor drainage: 6-8" (4" base rock + 2" DG)
• Driveways: 8-12" (6" base + 2-3" DG + stabilizer)

Grade for 1-2% cross-slope drainage.

Step 3: Install Weed Barrier

Lay professional landscape fabric (spun-bonded polypropylene). Overlap seams 12". Secure with fabric staples every 3-4'. Extend under edging.

Step 4: Base Layer (If Needed)

For clay, high traffic, or driveways: spread 3/4" minus crushed rock to required depth. Compact thoroughly with plate compactor. This prevents rutting and DG migration into subgrade.

Step 5: Install Edging

Edging contains DG and defines clean lines. Options:

• Steel/aluminum: Invisible, flexible for curves, durable
• Bender board: Economical, curves well, less durable
• Stone/brick/concrete: Visible, structural, higher cost

Set edging top 1/2" above finished DG grade.

Step 6: Spread & Level DG

Spread DG evenly to 2" depth (after compaction). Rake smooth. Use screed board on edges for consistent depth. Lightly mist with water—damp DG compacts better.

Step 7: Compact

Critical step. Plate compactor (rental: $60-80/day) makes 2-3 passes. Hand tamper for small areas. Compact until surface rings underfoot and shows no footprints. Add DG to low spots; recompact.

Step 8: Final Touches

• Light final misting activates fines binding
• Sweep excess from edging
• Allow 24-48 hours before heavy use
• Save leftover DG for future touch-ups

Maintenance & Longevity

• Annual: Rake smooth; add thin DG layer to high-wear spots
• Weeds: Spot-treat or hand-pull (fabric prevents most)
• Erosion: Regrade low spots; ensure drainage
• Stabilized DG: 3-5 years before major refresh
• Natural DG: 1-2 years in high traffic

Pro Tips

• Install in dry weather—wet subgrade = failure
• Compact in lifts if >2" depth
• Use stabilized DG for slopes >5%, driveways, ADA paths
• Consider header course of pavers at entry points for clean transition
• DG tracks indoors—use entry mats or transition to hard surface at doors

Decomposed granite pathways age gracefully, developing character while remaining permeable and repairable. A well-installed DG path is a landscape investment that improves with time—unlike concrete that only cracks.