Decomposed Granite
Decomposed Granite (often called DG) is a popular landscaping material that looks like fine gravel. It's made from natural granite stone that has broken down into smaller pieces over time. Landscapers use it for pathways, driveways, garden paths, and outdoor spaces because it's affordable, natural-looking, and helps with water drainage. It comes in different colors like tan, gray, and reddish tones, and can be either loose or stabilized (mixed with a hardening agent to make it firmer). This material is particularly popular in drought-prone areas because it requires little maintenance and fits well with water-wise landscaping approaches.
Examples in Resumes
Installed Decomposed Granite pathways in multiple residential projects
Managed DG installation for commercial park walkways
Designed and implemented Decomposed Granite driveways for sustainable landscape projects
Typical job title: "Landscape Installers"
Also try searching for:
Where to Find Landscape Installers
Professional Organizations
Online Resources
Example Interview Questions
Senior Level Questions
Q: How do you determine the appropriate depth and compaction requirements for a decomposed granite installation?
Expected Answer: A senior installer should explain that base depth typically ranges from 2-4 inches for pathways and 4-6 inches for driveways, discuss proper compaction methods, and mention factors like soil conditions and intended use that affect these decisions.
Q: How do you handle drainage issues when installing decomposed granite?
Expected Answer: Should discuss slope requirements (typically 2% minimum), proper base preparation, installation of edge restraints, and methods to prevent water pooling and erosion.
Mid Level Questions
Q: What are the differences between stabilized and loose decomposed granite?
Expected Answer: Should explain that stabilized DG includes a binding agent that makes it firmer and more durable, while loose DG is more natural-looking but requires more maintenance. Should discuss when to use each type.
Q: How do you calculate materials needed for a decomposed granite project?
Expected Answer: Should be able to explain how to measure area, determine depth requirements, and calculate cubic yards needed, including accounting for compaction rates.
Junior Level Questions
Q: What tools are needed for decomposed granite installation?
Expected Answer: Should list basic tools like plate compactor, rake, shovel, level, and explain their basic uses in DG installation.
Q: What safety measures do you take when installing decomposed granite?
Expected Answer: Should mention basics like dust masks, eye protection, proper lifting techniques, and basic tool safety.
Experience Level Indicators
Junior (0-2 years)
- Basic material spreading and raking
- Using hand tools and small equipment
- Following basic installation instructions
- Understanding proper depth requirements
Mid (2-5 years)
- Complex installation techniques
- Operating heavy equipment
- Material calculations and ordering
- Understanding drainage requirements
Senior (5+ years)
- Project planning and management
- Advanced installation techniques
- Training and supervising crews
- Troubleshooting complex installations
Red Flags to Watch For
- No experience with proper compaction techniques
- Lack of knowledge about proper drainage requirements
- Unable to calculate material quantities
- No understanding of proper base preparation
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