IN1 Intensive Green Roof Substrate

This green roof substrate has a greater organic content to allow it to support larger plants and also to be installed at deeper depths. Its sandy texture means that it can easily be installed at depths from 100 to 500 mm if sufficient weight bearing capacity is available.

This green roof substrate is designed for intensive green roofs, where planting schemes are much more detailed and formalized. This means that a wide range of plants can be supported in IN1, depending on how deep is has been installed.

Depending on the substrate depth and plant type, permanent irrigation systems (above or below ground) are sometimes installed. These are usually to act as a backup for extended dry periods and are not required for every day irrigation as the substrate has the ability to hold onto sufficient moisture during ambient conditions.

Features and benefits:

• Substrate density:
• Bulk density when oven dried: 1.07 g/cm³.
• Bulk density at 10% VMC: 1.33 g/cm³.
• Bulk density at field capacity: 1.46 g/cm³.
• Particle density: 2.18 g/cm³.
• Water and air:
• Field capacity: 53.9 % v/v.
• Total porosity: 48.9%.
• Porosity at field capacity: 57.5%.
• Effective porosity: 0.0%.
• Saturated hydraulic conductivity: 18 mm/min.
• Chemical:
• Organic matter: 3.7%.
• pH value: 8.
• EC: 3.1 mS/cm.
• Plant available nutrients:
• Nitrogen: 7.8 mg/L.
• Phosphate: >165 mg/L.
• Potassium: >241 mg/L.
• Particle size distribution:
• Stones (>8 mm): 10.4%.
• Coarse gravel (8–4 mm): 5.0%.
• Fine gravel (4–2 mm): 0.6%.
• Very coarse sand (2–1 mm): 7.2%.
• Coarse sand (1.0–0.5 mm): 20.1%.
• Medium sand (0.5–0.25 mm): 39.5%.
• Fine sand (0.250–0.125 mm): 15.5%.
• Very fine sand (0.125–0.050 mm): 1.2%.
• Silt (0.050–0.002 mm): 0.5%.
• Clay (<0.002 mm): 0.1%.