Choosing the correct turf specification is important because rooftop environments are different from ground-level landscaping.
Recommended Parameters for Roof Applications
| Performance Factor | Recommended Range / Requirement | Why It Matters |
|---|---|---|
| Grass height | 20–35 mm | Lightweight, easier drainage, easier maintenance |
| Backing system | Perforated or highly permeable backing | Helps rainwater pass through efficiently |
| UV resistance | Tested according to ASTM G154 or equivalent aging standards | Improves outdoor durability |
| Water permeability | Designed for rapid drainage | Reduces standing water risk |
| Fiber material | Virgin PE or PP materials preferred | Better durability and material consistency |
| Fiber recovery | High resilience structure recommended | Helps maintain appearance after foot traffic |
Waterproofing and Drainage: The Most Important Rooftop Installation Factors
The roof waterproofing system is often more important than the turf itself.
Before installation:
1. Inspect Existing Waterproofing
The roof membrane should be checked for:
- Cracks
- Aging damage
- Leakage points
- Drain blockage
Installing turf over a damaged waterproof layer may make future repairs more difficult.
2. Maintain Proper Drainage
A rooftop turf system should allow rainwater to move quickly toward drainage outlets.
Recommended practices include:
- Using permeable turf backing
- Installing drainage protection layers where needed
- Keeping roof drains accessible
- Avoiding debris accumulation
A well-designed drainage system helps reduce:
- Water pooling
- Additional temporary loads
- Moisture accumulation
3. Avoid Damaging Waterproof Layers
For most residential rooftops, drilling directly into waterproof membranes is not recommended.
Common installation approaches include:
| Fixing Method | Application |
|---|---|
| Non-permanent adhesive systems | Residential terraces |
| Edge fixing profiles | Rooftop landscaping |
| Floating installation | Low-impact leisure areas |
| Mechanical fixing | Requires waterproofing consideration |
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