TekDrain GF 25/320
Safe Water Management and Durable Structural Solution for Green Roof Systems
With the growing focus on sustainable and environmentally friendly construction, green roof applications provide significant advantages in terms of both aesthetics and energy efficiency. In these systems, the drainage board is one of the most critical components, ensuring proper water management and protecting the structure.
TekDrain GF 25/320 is manufactured from high-density polyethylene (HDPE) and offers maximum safety and long-lasting performance in green roof applications with its 320 kN/m² compressive strength.
Product Description
TekDrain GF 25/320 consists of HDPE drainage sheets that are resistant to root penetration and decay. It stores a portion of rainwater to reduce the irrigation needs of plants, while excess water flows safely through the sheet joints and is directed toward the parapet according to the slope of the structure.
With its 25 mm dimple height, the product provides both drainage and water reservoir functions simultaneously.
Technical Specifications
| Property | Value |
|---|
| Product Name | TekDrain GF 25/320 |
| Raw Material | HDPE (High-Density Polyethylene) |
| Compressive Strength | 320 kN/m² (TS EN ISO 25619) |
| Dimple Height | 25 mm |
| Water Retention Capacity | 5 lt/m² |
| Weight (Dry) | 1.4 kg/m² |
| Weight (Water Filled) | 5.5 kg/m² |
| Sheet Dimensions | 1 x 2 m (panel) |
| Water Flow Rate (I=0.01) | 0.95 lt/(m·s) |
| Water Flow Rate (I=0.02) | 1.35 lt/(m·s) |
| Water Flow Rate (I=0.03) | 2.10 lt/(m·s) |
| Certification | CE Certified – Compliant with TS EN ISO 25619 |
Features and Advantages
High Compressive Strength:
With a strength of 320 kN/m², TekDrain GF 25/320 provides deformation-free performance in extensive roof systems and green roofs installed over parking areas.
Dual Functionality:
With a 5 lt/m² water retention capacity, it supports plant hydration requirements while safely draining excess water.
Energy Efficiency:
It contributes to thermal insulation performance, helping reduce heating and cooling costs.
Durable HDPE Material:
The HDPE structure is resistant to root penetration, decay, and chemical effects, ensuring long service life.
UV Protection:
It protects the roof membrane and structural layers against harmful effects of sunlight.
Urban Water Management:
By storing rainwater and controlling drainage, it reduces the load on urban drainage infrastructure.
Environmentally Friendly Solution:
Its recyclable structure and energy-saving properties provide advantages in green building certification processes.
Application Areas
- Terrace roofs
- Green areas above parking structures
- Landscaped building roofs
- Urban gardens and green façade systems
Installation Method
After installing İzoTeknik 5000 or İzoTeknik 6500 over the root-resistant membrane, TekDrain GF 25/320 panels are placed side by side without overlapping. Then, a GeoTeknik 1100 PP geotextile layer is installed on top.
This system allows plant roots to access the water reservoir while maintaining a balanced natural water cycle.
Packaging and Storage
- Produced as 1 x 2 m panels
- Should be stored horizontally and protected from direct sunlight
Environmental Contributions
TekDrain GF 25/320 is not only a drainage board but also an important component of sustainable urban infrastructure. It supports energy savings, effective water management, and carbon reduction.
Green roof systems help reduce the urban heat island effect and contribute to improved air quality.
Conclusion
With its 320 kN/m² compressive strength, high water retention capacity, and durable HDPE structure, TekDrain GF 25/320 provides a reliable and long-lasting drainage solution for green roof systems.
Combining energy efficiency, environmental sustainability, and structural protection, it is an ideal choice for professional green building projects.
Frequently Asked Questions (FAQ)
What is TekDrain GF 25/320?
TekDrain GF 25/320 is a green roof drainage board manufactured from high-density polyethylene, offering 320 kN/m² compressive strength and water storage functionality.
Where is it used?
It is suitable for terrace roofs, rooftop parking areas, urban gardens, and green façade applications where effective drainage is required.
What is the water retention capacity?
The board can retain 5 lt/m² of water, helping prevent plants from drying out.
How does it contribute to the environment?
It reduces energy consumption, supports efficient water management, lowers carbon emissions, and contributes to green building certification points.
What makes it different from other models?
With its 320 kN/m² high compressive strength, TekDrain GF 25/320 is developed specifically for heavy-load green roof systems and is one of the strongest models in the TekDrain range.