Green-tree Extensive Roof Garden Substrate is a high-quality, BS8616:2019-compliant growing medium designed specifically for extensive green roof systems. Manufactured from the award-winning Green-tree Topsoil, this substrate offers a lightweight texture that ensures quick plant establishment in shallow green roof projects. Extensive roofs typically have a planting media depth ranging from 60mm to 200mm, making this substrate ideal for applications such as sedum matting, wildflower seeding, and biodiverse green roofs. Its balanced nutrient content supports healthy plant growth while maintaining low weight, which is crucial for rooftop installations with weight restrictions.

Features & Benefits:
BS8616:2019 Compliant: Meets the British Standard for green roof growing media, ensuring quality and consistency.
Lightweight Composition: Facilitates easy handling and installation, reducing structural load on rooftops.
Controlled Fertility Levels: Provides optimal nutrient content for plant establishment without the need for additional fertilisers during the first growing season.
Good Aeration and Water Holding Properties: Ensures proper root development and moisture retention, promoting plant health.
Low Maintenance: Ideal for green roofs requiring minimal upkeep, such as sedum and wildflower installations.
Environmentally Sustainable: Manufactured from recycled materials, contributing to sustainability goals.

Areas of Application:
Sedum Roofs: Provides the ideal growing medium for sedum matting and plug planting.
Wildflower Roofs: Supports the establishment of wildflower meadows on rooftops.
Biodiverse Green Roofs: Contributes to urban biodiversity by supporting a variety of plant species.
Retrofit Green Roof Installations: Suitable for upgrading existing roofs to green roofs.
Low Weight Green Roofs: Perfect for installations with strict weight limitations.

Technical Specifications:
pH Level: 8.0
Total Porosity: 56.3%
Saturated Hydraulic Conductivity: 7.3mm/min
Organic Matter (LOI): 2.9%
Bulk Density: Approximately 1.03 t/m³
Soil Texture: Lightweight aggregate and Green-tree Topsoil blend
Compliance: BS8616:2019

Delivery Options:
20kg Bags: Ideal for small-scale projects or areas with restricted access.
Bulk Bags (1m³ and 1.7m³): Suitable for medium to large-scale installations.
Loose Loads: Available for extensive projects; delivery charges vary based on load size and location.

Typical Analysis | Contact us for the latest soil testing data 

Product Name | Green-tree Extensive Roof Garden Substrate

Application Depth | 60mm–200mm typical for extensive green roofs

Composition | Lightweight aggregate blended with Green-tree Topsoil

pH Level | 8.0

Total Porosity | 56.3%

Saturated Hydraulic Conductivity | 7.3mm/min

Organic Matter (LOI) | 2.9%

Bulk Density | Approx. 1.03 t/m³

Compliance | BS8616:2019

Delivery Options | 20kg bags, bulk bags (1m³ / 1.7m³), or loose loads

Use Areas | Sedum roofs, wildflower roofs, biodiverse roofs, retrofits