For a typical garden installation, the base should provide:

• Adequate stability
• Appropriate drainage
• Sufficient flatness
• Suitable slope
• Resistance to settlement

A simplified construction may include:

Prepared subgrade → compacted aggregate/base → appropriate drainage → non-infill artificial turf

The exact layer thickness and materials should be determined according to soil conditions, drainage requirements, expected loads and local construction practice.

For example, a garden with poor natural drainage may require substantially different preparation from a well-drained sandy site.

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What Is the Best Installation Approach for Rooftop Turf?

A typical design concept is:

Roof structure → waterproofing → protection layer → drainage layer → turf system → perimeter fixing

However, this is only a conceptual sequence. Actual roof assemblies vary significantly.

Before installation, verify:

Structural

• Allowable roof load
• Dead load of the complete turf system
• Live load
• Local environmental loads

Waterproofing

• Existing membrane condition
• Protection layer
• Penetration details
• Expansion joints

Drainage

• Roof slope
• Drain capacity
• Access to drains
• Debris protection
• Emergency overflow provisions where required

Wind

• Perimeter fixing
• Mechanical or ballast-based fixing where appropriate
• Edge treatment
• Site-specific wind requirements

Do not penetrate a waterproofing membrane simply to secure artificial turf unless the roof-system designer has specifically approved the detail.